LX3V-4LTC - Wecon

= **1 Introduction** =

LX3V-4LTC is temperature control module, it has four temperature input ports and four transistor output ports (the collector is open), it reads data from thermocouple, and then output value with PID control.

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LX3V-4LTC needs to connect with LX3V series PLC

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1. Four input ports could support type K, type J, type T, type E, type N, type B, type R and type S thermocouple.

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1. When it connects with LX3V PLC, PLC could read/write data by “FROM/TO” instruction. (LX3V-4LTC could execute PID control and output control, it does not need user to write PID ladder.)

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1. Proportion coefficient, integral time, differential time of LX3V-4LTC can be self-tuning/

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1. Each channel is isolation each other.

= **2 Dimensions** =

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[[image:LX3V-4LTC_html_d0eefd90086ce676.png||class="img-thumbnail" height="394" width="1000"]]

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①Extension cable and connector

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②Com LED: Light when communicating

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③Power LED: Light when connect to 24V

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④State LED: Light when normal condition

⑤Module name

⑥Analog signal terminal

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⑦Extension module interface

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⑧DIN rail mounting slot

⑨DIN rail hook

⑩Mounting holes (φ4.5)

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**Using crimp terminations**

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* Be sure to use the crimp-style terminals that satisfy the dimensional requirements shows in the left figure.

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* Apply 0.5 to 0.8 N.m (5 to 8 kgf.cm) torque to tighten the terminals to prevent abnormal operation.

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* Other terminals should be empty but only wiring terminals mention in this manual.

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[[image:LX3V-4LTC_html_67891e8f02a25438.png||class="img-thumbnail" height="199" width="300"]]

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= **3 Wiring** =

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1. The compensating cables that connect with thermocouples could be as follows:

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Type K: KX-G, KX-GS, KX-H, KX-HS, WX-G, WX-H, VX-G

Type J: JX-G, JX-H

Type K: SC-G, SC-H

Type N: NC-G, NC-H

Type E: EX-G, EX-H

Type T: TX-G, TX-H

Type B: BC-G, BC-H

Type R: RC-G, RC-H

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[[image:LX3V-4LTC_html_1a21799ac3e4e881.png||class="img-thumbnail" height="360" width="400"]]

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For every 10Ω of line resistance, the compensating cable will indicate a temperature 0.12°C higher than actual. Please check the line resistance before installation. Long compensating cables are more prone to noise interference, shorter (less than 100m) compensating cable is recommended.

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1. Connect the ground terminals of the LX3V-4LTC unit with the main unit. And the main unit should be 3 grade grounding.

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1. The built-in 24V DC output of PLC main unit could be used as the power supply of LX3V-4LTC.

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1. FG1-FG4:GND connection of each channel.(generally it is not necessary to connect unless sensor signal is not stable)

**Cautions**

* Make sure all power be shut down before installation or wiring. Otherwise, it maybe cause electrical shock or components damaged.

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* It would be dangerous if system and loads outside starts simultaneously, please make sure both of them are interlocked each other by PLC ladder or other ways.

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* Please connect the PLC main unit and LX3V-4LTC with power supply properly; the main unit or LX3V-4LTC would be damaged if AC supply connects with DC I/O or DC power terminal.

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* Do not connect the empty terminals with outside wire, which could damage your devices.

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= **4 Specifications** =

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**General specification**

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|**Item**|**Specification**

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|General specifications|Same as those for the main unit

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|Dielectric withstand voltage|500V AC, 1min (between all terminals and ground)

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**Power supply specification**

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|**Item**|**Specification**

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|Analog circuits|24V DC ± 10%, 50mA

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|Digital circuits|24V DC, 35mA (internal power supply from the main unit)

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**Performance specification**

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|(% rowspan="2" %)**Item**|(% colspan="2" %)**Centigrade (°C)**|(% colspan="2" %)**Fahrenheit (°F)**

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|(% colspan="4" %)Both °C and °F are available by reading the appropriate buffer memory (BFM).

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|Input signal|(% colspan="4" %)Thermocouple: Type K, J, T, E, N, B, R, S (each type can be used for each channel), 4 channels most.

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|(% rowspan="8" %)(((

Rated temperature

range

)))|Type K|-100 to +1,200|Type K|-148 to +2,192

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|Type J|-100 to +600|Type J|-148 to +1,112

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|Type T|-100 to +400|Type T|-148 to +752

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|Type E|-100 to +1,000|Type E|-148 to +1,832

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|Type N|-100 to +1,300|Type N|-148 to +2,372

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|Type B|+250 to +1,800|Type B|-482 to +3,272℉

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|Type R|-50 to +1,768|Type R|-58 to +3,214.4

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|Type S|-50 to +1,768|Type S|-58 to +3,214.4

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|(% rowspan="9" %)Digital output|(% colspan="4" %)12-bit conversion, saved in 16-bit binary complement form

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|Type K|-1,000 to +12,000|Type K|-1480 to +21,920

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|Type J|-1,000 to +6,000|Type J|-1480 to +11,120

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|Type T|-1,000 to +4,000|Type T|-1480 to +7,520

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|Type E|-1,000 to +10,000|Type E|-1480 to +18,320

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|Type N|-1,000 to +13,000|Type N|-1480 to +23,720

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|Type B|+2,500 to +18,000|Type B|-4820 to +32,720

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|Type R|-500 to +17,680|Type R|-580 to +32,144

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|Type S|-500 to +17,680|Type S|-580 to +32,144

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|Type J|0.3°C|Type J|0.54°F

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|Type T|0.4°C|Type T|0.72°F

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|Type E|0.25°C|Type E|0.45°F

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|Type N|0.52°C|Type N|0.936°F

|Type B|(((

2.09°C

2.97°C (less than 1,000°C)

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1.64°C (more than 1,000°C)

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3.762°F

5.346°F (less than 1,832°F)

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2.952°F (more than 1,832°F)

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|Type R|(((

1.53°C

1.87°C (less than 800°C)

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1.32°C (more than 800°C)

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2.754°F

3.366°F (less than 1,472°F)

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2.376°F (more than 1,472°F)

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|Type S|(((

1.72°C

2.01°C (less than 800°C)

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1.53°C (more than 800°C)

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3.096°F

3.618°F (less than 1,472°F)

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2.754°F (more than 1,472°F)

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Overall accuracy

Calibration point

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± (0.5% full scale +1°C)

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Freezing point of pure water 0°C / 32°F

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**✎Note: **Earth-tipped thermocouples are not suitable for this unit.

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Earth-tipped thermocouples are not suitable for this unit.

**Analog Input**

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**Conversion Characteristics**

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Readings given at calibration reference point 0°C/32°F (0/320) respectively. (subject to the overall accuracy)

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|[[image:LX3V-4LTC_html_92edc788ec28d1cf.gif||class="img-thumbnail"]]|[[image:LX3V-4LTC_html_304483742690ee7c.gif||class="img-thumbnail"]]

**Miscellaneous**

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|**Item**|**Specification**

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|Isolation|It has optical isolation between analog and digital circuits. DC/DC converter is applied to isolate between this device and MPU. It has signal isolation between each analog channel.

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= **5 Buffer Memory (BFM)** =

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**Buffer memory list**

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|(% colspan="4" style="width:310px" %)**BFM No.**|(% rowspan="2" style="width:143px" %)**Name**|(% rowspan="2" style="width:68px" %)**Latched**|(% rowspan="2" style="width:77px" %)**Operation**|(% rowspan="2" style="width:104px" %)**Default value**|(% rowspan="2" style="width:348px" %)**Contents**

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|(% style="width:55px" %)CH1|(% style="width:12px" %)CH2|(% style="width:52px" %)CH3|(% style="width:65px" %)CH4

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Each number of 4 HEX corresponds to one channel, the highest bit is CH4, the lowest is CH1.

0: Type K

1: Type J

2: Type T

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[[image:LX3V-4LTC_html_9936e798cd945c5e.gif]]

3: Type E

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4: Type N

5: Type B

6: Type R

7: Type S

Others: not used.

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|(% style="width:55px" %)#1|(% style="width:12px" %)#2|(% style="width:52px" %)#3|(% style="width:65px" %)#4|(% style="width:143px" %)Averaged constant of filter|(% style="width:68px" %)0|(% style="width:77px" %)W/R|(% style="width:104px" %)8|(% style="width:348px" %)Count of temperature sampling for averaging. Please set 1 for High-speed sampling. Only the range 1 to 256 is valid for the number of temperature readings to be averaged. If a value outside of this range is entered, a default value of 8 is used.

B0: A/D conversion would be stopped when b2 or b3 is ON.

B1: Not used;

B2: power failed;

B3: Hardware failed;

B4~~B7: Not used;

B8: Values backup error;

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B10: Digital output/analog input value is out of the specified range;

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B11: Averaged value is out of the available range;

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B13: backup error(during executing value backup(BFM42 is non-zero),and backup failed, this bit is ON.)

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B14: It is in backup status(during executing value backup(BFM42 is non-zero),and backup failed, this bit is ON.)

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B15: Initialization completion flag;(during initializing, (BFM42 is 1 or 2), when it finished, this bit is ON.)

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0: Performs nothing

1: Initializes all data

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2: Initializes BFM #19 to BFM #174

3: Initializes error

Others: No action

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0: Performs nothing

Other: Performs backups

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b0: Reserved;

b1: value range setting error;

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b2: PID self-tuning error;

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b3: The difference of setting value and offset value of PID self-tuning is too small;

b4~~b5: Reserved;

b6: Channel mode Error/ This channel is not enabled;

b7: PV exceeded;

b8: PID self-tuning parameters are changed in process;

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b0 & b15: Reserved;

b4: Alarm 1 - When alarm 1 occurs, it is set ON;

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b5: Alarm 2 - When alarm 2 occurs, it is set ON;

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b6: Alarm 3 - When alarm 3 occurs, it is set ON;

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b7: Alarm 4 - When alarm 4 occurs, it is set ON;

b8: Heating control;

b9: Cooling control;

b10: PID terminals output;

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b11: PID control flag;

b12: Manual flag;

b13: Self-tuning;

b14: ON / OFF control;

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Unit: 0.1 °C

Sampling temperature (from averaged value) during executing.

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0: Stops control;

Other: Starts control;

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0: AUTO;

Other: MAN;

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0: Stops self-tuning;

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Other : starts self-tuning;

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0: Heating control;

1: Cooling control;

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Unit: 0.1 °C

The target temperature of PID control

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KP = 0, ON / OFF control is executed.

Range: 0-32767.

Note: This value is magnified 256 times; the actual value is KP / 256.

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The maximum rate of rise: 0-320;

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Range: 0-32000 (0-320);

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1-100 (*500ms);

Range: 0.5s-50s;

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Dead zone is used for ON/OFF control mode

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Range: 0-100 (Unit: 0.1%)

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Lower & upper threshold of input (Unit: 0.1 °C)

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Remark: This BFM is used for the upper threshold of input value.

Range:

K type: -100°C - 1200°C

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J type: -100°C - 600°C

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Lower & upper threshold of input (Unit: 0.1 °C)

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Remark: This BFM is used for setting lower threshold of input.

Range:

K type: -100°C - 1200°C

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J type: -100°C - 600°C

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This BFM is used for setting the upper threshold of output.

Range: 0-2000

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This BFM is used for setting the lower threshold of output.

Range: 0-2000

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It is used for alarm mode of four channels;

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[[image:LX3V-4LTC_html_de0e4e05bfd9b167.gif]]

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Unit: °C

The alarm range, it depends on alarm mode.

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Calculation of dead zone

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Bias: (SV+ bias)* dead zone

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Upper & lower threshold mode: Alarm setting value* dead zone

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0: Normal;

Others: Error in setting address

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**✎Note: **

0: Retentive;

X: Non-retentive;

R: Only read is enabled;

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R/W: Both read and write are enabled;

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**Details of buffer memories**

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* **Buffer Memory BFM #0: Thermocouple Type K or J selection mode**

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BFM #0 is used for selecting type K or J thermocouples for each channel. Each bit of a 4 digit hexadecimal number corresponds to one channel, the last digit is channel 1.

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[[image:LX3V-4LTC_html_9936e798cd945c5e.gif||class="img-thumbnail" height="173" width="300"]]

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The time of A/D conversion is 240ms for each channel. When “3" (unused) is set for a channel, this channel would not have A/D conversion, therefore, the total time for conversion decreases. In the above example, the conversion time is as follows:

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240ms (conversion time per channel) × 2channels (number of channels used) = 480ms (total conversion time)

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* **Buffer Memory BFMs #1 to #4: Number of temperature readings to be averaged**

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When the value of averaged temperature is assigned to BFMs #1 to #4, the averaged data is stored in BFMs #5 to #8 (°C) and #13 to #16 (°F). Only the range 1 to 256 is valid for the number of averaged temperature. If a value out of this range, the default value is 8.

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* **Buffer Memory BFMs #9 to #12 and #17 to #20: Current temperature**

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These BFMs store the current input value. This value is stored in units of 0.1°C or 0.1°F, but the resolution is only 0.4°C or 0.72°F for Type K and 0.3°C or 0.54°F for Type J.

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* **Buffer Memory BFM #28: Digital range error latch**

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BFM #29 b10(digital range error) is used for confirm if the measured temperature is in the range of this unit.

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BFM #28 latches the error status of each channel and can be used to check for thermocouple disconnection.

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|**b15 ~~ b8**|**b7**|**b6**|**b5**|**b4**|**b3**|**b2**|**b1**|**b0**

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|(% rowspan="2" %)Not used|High|Low|High|Low|High|Low|High|Low

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|(% colspan="2" %)CH4|(% colspan="2" %)CH3|(% colspan="2" %)CH2|(% colspan="2" %)CH1

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**Low:** Latches ON when the measured temperature drops down and less than the lowest temperature threshold.

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**High: **Turns ON when measured temperature rises up and more than the highest temperature threshold, or the thermocouple was disconnected.

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When an error occur the temperature data before the error is latched. If the measured value returns to normal threshold, all data return to run properly again. (Note: The error remains latched in (BFM #28))

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An error can be cleared by writing K0 to BFM #28 using the TO instruction or turning off the power.

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* **Buffer Memory BFM #29: Error status**

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|**Bit devices of BFM #29**|**Error information**

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|b0|Error, when either b1~~ b3 is ON, A/D conversion is stopped.

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|b1, b4~~b7|Not used;

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|b2|24V DC power supply failed;

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|b3|Hardware failed;

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|b8|Backup error of set value.

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|b10|Digital output/analog input value is out of the specified range;

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|b11|The value of averaged results is out of the available range;

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|b13|Backup error, during executing of backup,(BFM42 is non-zero) , and backup failed, this bit sets to ON;

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|b14|It is in backup status, this bit sets to ON;

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|b15|Initialization completion flag;

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* **ID Code Buffer Memory BFM #30**

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The identification code or ID number for this Special Block is read from buffer memory BFM #30 by FROM instruction. This number for the LX3V-4LTC unit is K2130. The PLC can use this ID in program to identify the special block before commencing data transfer to and from the special block.

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* **Error flag BFM #43, BFM#81, BFM#119, BFM#157 (Temperature control is stopped)**

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|**Error flag**|**Content**|**Remark**

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|b0, b4, b5|Not used;|-

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|b1|Error in setting value range.|When set value is out of the specified range, this bit sets to ON. The error addresses will be showed in BFM#75, BFM#113, BFM#151, BFM#189

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|b2|PID self-tuning error;|When either b3 or b8 is ON, this bit set ON

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|b3|The difference of set value and offset are too small.|The difference between measured temperature (PV) and SV + DIFF less than 100 in self-tuning mode, or SV+DIFF exceeded PV’s range. This bit sets to ON

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|b6|Channel mode Error/ This channel is disable;|When the channel is disabled by BFM#0, this bit sets to ON.

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|b7|PV exceeded;|When measured temperature exceeded PV’s range, this bit sets to ON.

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|b8|PID self-tuning parameters are changed in process;|When one of upper & lower threshold, set value, bias changes, this bit sets to ON.

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* **BFM #48 (CH1), BFM #86 (CH2), BFM#124(CH3), BFM#162(CH4) : Auto/manual mode changeover**

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BFM #48 is used for changing the mode of CH1. BFM #86 is used for changing the mode of CH2. BFM #124 is used for changing the mode of CH3. BFM #162 is used for the mode of CH4.

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When BFM #48/#86/#124/#162 is set to "K0 (initialized value)", the auto mode is selected.

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When BFM #48/#86/#124/#162 is set to "K1", the manual mode is selected.

**Auto mode:**

The measured value (PV) is compared with the set value (SV), PID arithmetic operation is performed, then output the control value (MV).

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In the auto mode, the manual output set value (CH1: BFM #48, CH2: BFM #86, CH3: BFM#124, CH4:BFM#162) is always equival with the control output value.

**Manual mode:**

The control output (MV) value is fixed to the manual output set value (CH1: BFM #48, CH2: BFM #86, CH3: BFM#124, CH4:BFM#162).

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The manual output set value can be changed while b13 of the event (CH1: BFM #48, CH2: BFM #86, CH3: BFM#124, CH4:BFM#162) is ON even if operation is performed in the manual mode.

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The temperature alarm function is effective even in the manual mode.

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1. **Self-tuning function**

**Self-tuning**

The self-tuning function automatically measures, calculates and sets the most optimal PID constants in accordance with the set temperature.

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When the self-tuning execution command (CH1: BFM #48, CH2: BFM #86, CH3: BFM#124, CH4: BFM#162) is set to "1", self-tuning is performed. (Self-tuning can start from an arbitrary status at any time immediately after the power is turned ON, while the temperature is rising or while control is stable.)

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When self-tuning starts, two-position control is performed using the set value (SV). By two-position control, the output is forcedly hunted and its amplitude and oscillation cycle are measured. PID constants are calculated based on the measured values, and stored in each parameter. When self-tuning normally finishes, control continues with new calculated PID constants.

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While self-tuning is performed, b14 of the event (CH1: BFM #48, CH2: BFM #86, CH3: BFM#124, CH4: BFM#162) is set to "1".

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(In order to calculate proper PID constants by self-tuning, set the upper limit of the output limiter to 2000, the lower limit of the output limiter to 0.)

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Self-tuning can be started with the following conditions:

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* The control start/stop changeover set to "1: Starts control".

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* The operation mode sets to "2: Monitor + Temperature alarm + Control".

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* The auto/manual mode is "0: AUTO".

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* The measured value PV is normal.

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* The upper threshold and lower threshold for output should be different.

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Self-tuning would be canceled with one of the following conditions:

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[[image:LX3V-4LTC_html_98e0b421b7f760bb.png||class="img-thumbnail" height="217" width="500"]]

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* SV value has been changed.

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* The control has been stopped, the operation mode is "0: Stops control".

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* The auto/manual mode is set to "1: MAN".

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* The PV bias has been changed.

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* The upper and lower threshold for output has been changed.

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* The self-tuning executed command is set to "0: Stops auto tuning".

* Power failed

**Self-tuning bias**

If the self-tuning bias has been used for auto-tuning, The measured value (PV) should not exceed the set value (SV). The self-tuning makes the measured value vibrating and SV switching ON/OFF, then calculates and sets each PID constant. However, for some control targets, overshoot by vibration is not permitted, Set the self-tuning bias is necessary for this case. The set value(SV) could be changed when self-tuning bias is set.

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[[image:LX3V-4LTC_html_797cdf2f2cae01b5.png||class="img-thumbnail" height="197" width="500"]]

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**Dead zone (adjustment sensitivity) setting**

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601

BFM #62 is used for dead zone of CH1. BFM #100 is used for the dead zone of CH2. BFM #138 is used for the dead zone of CH3.BFM #176 is used for the dead zone of CH4.

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When system has been turning ON/OFF operations, if the adjustment sensitivity has been configured, it could avoid temperature value (SV) show ON/OFF changes nearby.

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The value set to BFM #62/#100/#138/#176 is equally to the value of the upper and the lower area of the temperature set value (BFM #52/#90/#128/#166).

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For example, if the sensitive value sets to "10%", 5% above and 5% below of the set value would be treated as the dead zone (width of 10% in total).

**Example**

* Conditions:

When BFM #41/#60 is set to "10.0%" in the range span of 400°C

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400°C x 10.0% / 100 = 40°C

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When the temperature set value is 200°C, the range from 180 to 220°C is treated as the dead zone.

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619

When the dead zone sets to a large value, vertical fluctuation would be larger. But if dead zone is too small, small oscillations of the measured value may cause vibration.

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[[image:LX3V-4LTC_html_f8ae0c0b5cfc3817.png||class="img-thumbnail" height="226" width="600"]]

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* **Output(MV) upper threshold: BFM #65/#103/#141/#179**

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626

**Output(MV) lower threshold: BFM #66/#104/#142/#180**

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628

BFM #65/#103/#141/#179 are used for output upper threshold of CH1/CH2/CH3/CH4.

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630

BFM #66/#104/#142/#180 are used for output lower threshold of CH1/CH2/CH3/CH4.

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632

These BFMs could be used for setting the upper threshold and the lower threshold of the control output value (MV) (BFM #46/#84/#122/#160). The range of the upper threshold is from the lower threshold of the output limiter to 2000. The range of the upper threshold is from 0 to the upper threshold of the output limiter.

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[[image:LX3V-4LTC_html_39b35ec1eae61e45.png||class="img-thumbnail" height="222" width="400"]]

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1. Proper PID constants could not be obtained during self-tuning while the output limiter is active. So it is not recommended not to use the output limiter when self-tuning is active.

638

1. The output limiter would not be active when two-position control is active,.

639

1. If lower threshold and self-tuning is active, please set the upper and lower threshold for PV, otherwise the temperature may continue to rise, and out of system control.

640

641

* **Alarm mode setting: BFM#68/ BFM#106/ BFM#144/ BFM#182**

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643

LX3V-4LTC has 12 alarm modes. Four of them most could be used meanwhile. BFM #68 is used for CH1 alarm mode, BFM#106 is used for CH2 alarm mode, BFM#144 is used for CH3 mode, BFM#182 is used for CH4 alarm mode.

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645

Each channel could have four alarm modes.

646

647

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648

[[image:LX3V-4LTC_html_de0e4e05bfd9b167.gif||class="img-thumbnail" height="166" width="500"]]

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650

Example: BFM#68=H0021 means CH1 has the following four type alarm modes: the first is upper threshold alarm, second is lower threshold, third is close alarm, and fourth is close alarm.

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652

For detailed please refer to the following table

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654

(((

655

(% class="table-bordered" %)

656

|**Alarm No.**|**Alarm mode**|**Description**|**Set range**

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|0|Alarm is disabled|Alarm function is disabled.|~-~--

658

|1|Alarm for Upper threshold of input value|Alarms if measured value (PV) is more than value of alarm.|Input range

659

|2|Alarm for lower threshold of input value|Alarms if measured value (PV) is less than value of alarm.|Input range

660

|3|Alarm for upper threshold deviation|Alarms if deviation (= Measured value (PV) – Set value (SV)) is more than value of alarm.|±Input width

661

|4|Alarm for lower threshold deviation|Alarms if deviation (= Measured value (PV) – Set value (SV)) is less than value of alarm.|±Input width

662

|5|Alarm for Upper/lower limit deviation|Alarms if absolute deviation (= Measured value (PV) – Set value (SV)) is less than value of alarm.|+Input width

663

|6|Range alarm|Alarms if absolute deviation (= Measured value (PV) – Set value (SV)) is less than value of alarm.|+Input width

664

|7|Alarm for upper threshold input value alarm with wait|Alarms if measured value (PV) is more than set value, However, measured value is ignored at the start of system.|Input range

665

|8|Alarm for lower threshold input value alarm with wait|Alarms if measured value (PV) is less than set value, However, measured value are ignored at the start of system.|Input range

666

|9|Alarm for upper threshold deviation with wait|Alarms if deviation (= Measured value (PV) – Set value (SV)) is more than value of alarm. However, measured value is ignored at the start of system.|±Input width

667

|10|Alarm for lower threshold deviation with wait|Alarms if deviation (= Measured value (PV) – Set value (SV)) is less than value of alarm. However, measured value is ignored at the start of system.|±Input width

668

|11|Alarm for Upper/lower limit deviation with wait|Alarms if absolute deviation (= Measured value (PV) – Set value (SV)) is less than value of alarm. However, measured value is ignored at the start of system.|+Input width

)))

**✎Note: **

* Input range: it is from the lower threshold to the upper threshold of input value

674

* Input width: Width from the lower threshold to the upper threshold of input value (Input width = Upper threshold value - Lower threshold value).

675

* ±Input width: it could be positive and negative.

676

* + Input width: it could be positive only.

677

678

1. **Alarm dead zone setting**

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680

BFM #73 is used for the dead zone of alarms 1 to 4 for CH1. BFM #111 is used for the dead zone of alarms 1 to 4 for CH2. BFM #149 is used for the dead zone of alarms 1 to 4 for CH3. BFM #187 is used for the dead zone of alarms 1 to 4 for CH4. When the measured value (PV) is near the alarm set value, the alarm status and the non-alarm status may be repeated by fluctuation in input area. In this case, setting the alarm dead zone could avoid the repeating of the alarm status and the non-alarm status.

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682

The allowable set range is the input range (from 0.0 to 10.0 %.)

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684

**Calculation of dead zone**

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686

In deviation mode: dead zone =(SV+ deviation)*dead zone

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688

In upper/lower threshold mode: dead zone=alarm setting value*dead zone

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690

1. Upper threshold input alarm and upper threshold deviation alarm

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692

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[[image:LX3V-4LTC_html_5d9062fb0bab5b33.png||class="img-thumbnail" height="198" width="600"]]

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695

1. Lower threshold input alarm and lower threshold deviation alarm

696

697

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698

[[image:LX3V-4LTC_html_89ce396354c991f8.png||class="img-thumbnail" height="190" width="600"]]

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700

1. Upper/lower threshold deviation alarm

701

702

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[[image:LX3V-4LTC_html_6f9dd5f8d717395.png||class="img-thumbnail" height="241" width="600"]]

704

705

* **Number of times of alarm delay**

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707

BFM #74/#112/#150/#188 are used for the number of alarm delays of CH1/CH2/CH3/CH4 respectively. This setting is active for all alarms 1 to 4.

708

709

The alarm delay function keeps non-alarm status until the number of input samples exceeds the number of alarm delays, after the deviation between the measured value (PV) and the set value (SV) reaches the alarm set value. If the deviation is in the alarm range, the Alarm happens when the deviation remains in the alarm range until the number of input samples exceeds the number of alarm delays

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711

Example: the number of alarm delay sets to 5 times

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713

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[[image:LX3V-4LTC_html_1094d322a8c61ac3.png||class="img-thumbnail" height="346" width="600"]]

715

716

* **Address of value range error**

717

718

When there has an out-of-range error occurs in the set value, BFM #75/#113/#151/#189 will show the error address,

719

720

BFM #75/#113/#151/#189 sets to "0" when no error happens.

721

722

When an error occurs, the value of BFM #75/#113/#151/#189 is the address of BFM has errors, please check the range, and give a normal value for this BFM, please clear the error after that (BFM#41).

723

724

* **Output cycle control**

725

726

BFM #59 is used for the control output cycle of CH1. BFM #97 is used for the control output cycle of CH2. BFM #135 is used for control output cycle of CH3. BFM #173 is used for the control output cycle of CH4. Control cycle is longer than sampling cycle, the sampling cycle is equal with control output cycle when control cycle is less than sampling cycle.

727

728

This value multiplies by the control output value and divided by 2000 is treated as the ON time. This value multiplies by "2000 - Control cycle value ~(%)/2000" is the OFF time.

729

730

The allowable range of this value is from 1 to 100 sec.

731

732

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733

[[image:LX3V-4LTC_html_79f827d969cd03f8.png||class="img-thumbnail" height="102" width="500"]]

734

735

= **6 Program Example** =

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737

* Keep doing nothing while the power is supplied.

738

739

If you touch a terminal while the power is supplied, you may get electrical shock or the unit may malfunction.

740

741

* Make sure the power be OFF before cleaning the unit or tightening the terminals.

742

743

If you clean the unit or tighten the terminals while the power is supplied, you may get electrical shock.

744

745

* To run temperature control module in safe, please read this manual carefully firstly.

746

747

Damages or accidents would happen if the operations is not right.

748

749

* Never disassemble or modify the unit. Disassembly or modification may cause failure, malfunction amd fire.

750

751

~* For repair, contact WECON Technology Co., Ltd.

752

753

* Make sure power is off before wiring.

754

755

Failure or malfunction maybe happen because of wiring during power is on.

**Simple example**

In this example, LX3V-4LTC module occupies the position of No.2 special module (This is the 3rd model connects with CPU). CH1 connects with K type thermocouple, CH2 connects with J type thermocouple, CH3 and CH4 connects with E type thermocouple, the average is 4. The value of CH1~~CH4 are written to D0~~D3.

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761

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762

[[image:LX3V-4LTC_html_aebb33707de8c24a.png||class="img-thumbnail" height="116" width="600"]]

763

764

Initialization to check if the No.2 special module is LX3V-4LTC. The ID code should be as K2130 (BFM#30).

**Program example**

Input range: K type ~-~- 100.0 to 400.0 °C

769

770

PID values: it is determined by auto-tuning

771

772

Alarm: Upper threshold alarm is 820 and lower threshold alarm is 780

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774

Heater/cooling control: Heater (Initialization)

* Device assignment:

X000: initialization

X001: Reset the flag of error bit.

781

782

X002: Control starts (ON)/stop (OFF);

783

784

X003: self-tuning beginning when it changes from 0 to 1.

785

786

M0~~M15: Flags of error

787

788

M20~~M35: Flags of events

789

790

D0~~D199: Read value from BFM

791

792

D200~~D399: Write set value(SV) into BFM

* Project:

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797

[[image:LX3V-4LTC_html_c23b907303de1a1d.png||class="img-thumbnail" height="770" width="700"]]

= **7 Diagnostic** =

**Basic check**

* Check whether the input/output wiring and/or extension cables are properly connected with LX3V-4LTC analog special function block

804

* All configurations should follow the rule of LX3V configuration. The number of special function blocks does not exceed 16 and the total number of PLC system should exceed 256.

805

* Ensure that all operating ranges is normal.

806

* Ensure there is no power overload in either the 5V or 24V power supplies, Warning: the load for LX3V MPU or other powered extension unit is variable with the number of modules or special modules .

807

* The main processing unit (MPU) is in RUN status.

**Error checking**

If LX3V-4LTC cannot run properly, please check the following items.

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813

* Check the status of the POWER LED.

814