1. Installation
- Before installation, it must be ensured that the PLC host and the related device of the BD board terminal wiring are powered off reliably. The module shell is inserted into the BD module slot of PLC host, and then locked with two standard screws for fixation.
- Two standard terminal heads are equipped with this Bd board. After connecting the wiring, insert them into its terminal. After confirming that the host, BD board, wiring, etc. are installed correctly, it can be powered on for use.
- ✎Note:
- When DAI current is output, ensure that the external load resistance is less than 500Ω. If the external load resistance is greater than 500Ω, the output current will be lower than normal value.
- Please install the BD board firmly and fix it on PLC. Poor contact may lead to failure.
- Tightening torque for fixing BD board or PLC top cover is 0.3N.m to0.6N.m. Please tighten it firmly to avoid malfunction.
- You can only use a LX5V-2PT2DAI-BD on the PLC main unit of LX5 series.
- Warning: Cut off the power before installing, removing or wiring the BD board to avoid electric shock or product damage.
2. Appearance and terminal
IN_2PT part 2-wire/3-wire PT100 thermal resistance | OUT_2DAI part Current output range: 4mA to 20mA | ||
| L2- | Channel 2 sensor signal input negative | Io2- | Channel 2 sensor signal output negative |
| L2+ | Channel 2 sensor signal input positive | Io2+ | Channel 2 sensor signal output positive |
| VI- | Sensor common pole | NC | |
| L1+ | Channel 1 sensor signal input positive | Io1+ | Channel 1 sensor signal output positive |
| L1- | Channel 1 sensor Signal input negative | Io1- | Channel 1 sensor signal output negative |
| Indicator lamp | Description |
| PWR | ON when power-on (when the program is running, it will be ON). |
| COM | It flashes when communicating with PLC normally, and it is OFF when timeout. |
| CH1 | Channel 1 lamp: Always on in range; Flashing outside the range of -100℃to600℃; Off when the channel is closed. |
| CH2 | Channel 2 lamp: Always on in range; Flashing outside the range of -100℃to600℃; Off when the channel is closed. |
| CH3 | Channel 3 lamp: Set the digital value 0to 2000 (4mA) to 20mA) to be always on; Flashes outside the digital value 0 to2000 (4mA to 20mA). When the channel is open, the light is on, and the current is output; When the channel is closed, the light is off, and the current is not output (approaching 0). |
| CH4 | Channel 4 lamp: Set the digital value 0to 2000 (4mA) to 20mA) to be always on; Flashes outside the digital value 0 to2000 (4mA to 20mA). When the channel is open, the light is on, and the current is output; When the channel is closed, the light is off, and the current is not output (approaching 0). |
3. Specification
1. General specification: Same as PLC main unit. (Please refer to the accompanying manual of the PLC main unit.)
2. Power supply specification: The power supply is provided internally by PLC.
3. Performance specifications:
| Project | Description | |
| Power supply | 24VDC±10%, 50mA; 5VDC±10%, 70mA (The power supply is provided internally by host) | |
| PT part | ||
| Analog input signal | Platinum thermal resistance PT100 sensor (100Ω), 3-wire, 2-channel input (CH1, CH2) | |
| Sensor current | 1mA sensor: 100 Ω (PT100) | |
| Compensation range | -100 ℃ to 600 ℃ (recommended range) | Over range display: 32767 |
| Digital output | -1000 to 6000 (unit 0.1 ℃) | |
| Measurement accuracy | 0.2℃ to 0.3℃ | |
| Total accuracy | Full range ±0.5% (compensation range) | |
| Conversion speed | 2 channels 50ms | |
| Conversion features |  | |
| DAI section | ||
| Rated range | 0 to 2000: 4mA to 20mA | |
| Analog output range | DC 4mA to 20mA (external load resistance ≤ 500 Ω) | |
| Digital output | 12-bit binary | |
| Resolution | 8uA (4mA to 20mA/2000) | |
| Comprehensive precision | ±0.5% of full scale (4mA to 20mA: ±0.08 mA) | |
| D/A conversion time | One scan cycle (D/A conversion after ladder diagram END instruction is executed, and BD channel output value is updated) | |
| Output features | External load is 250Ω. 0 to 2000 was converted to 4mA to 20mA.
| |
| Points occupied | 0 point (2DAI is not affected by the standard maximum control points of the main PLC because it is operated through the data register) | |
4. Wiring
Wiring instructions:
- 2-wire PT100: When using channel 1, L1- and VI- are shorted with wires, and the two leads of the sensor are connected to L1+ and LI- respectively. Similarly, when using channel 2, L2- and VI- are shorted with wires, and the two leads of the sensor are connected to L2+ and L2- respectively.
- 3-wire PT100: When using channel 1, two leads of the same color are connected to L1- and VI- respectively, and the other lead of different color is connected to L1+. Channel 2 is connected in the same way.
 |
| Cut off the power before installing, removing or wiring the BD board to avoid electric shock or product damage. |
✎Note:
- Do not place signal cables near high voltage power cables or in the same trunk line. Otherwise, it may be disturbed or surged. Keep a safe distance between signal cable and power cable, at least 100mm.
- Ground the shielding of shielded wire or shielded cable. But the ground point and high voltage line cannot be the same.
- Do not connect cables of impermissible size to avoid poor contact or product damage.
- Fix the cable so that no force directly acts on the terminal line or cable connection area.
- The tightening torque of terminal is 0.5Nm to 0.6N.m. Please tighten it to prevent malfunction.
- Do not use empty terminals.
4.1 Applicable cables
1. AWG25-16 is used for connection with output device.
2. Maximum terminal tightening torque is 0.5N.m to 0.6N.m.
3. Using different types of cables may cause poor contact with terminals. Please use pressfit terminals for good contact.
Line number and cross-sectional area
| Line number | Cross-sectional area (mm2) | End processing |
| AWG26 | 0.1288 | Stranded cable: Strip off the sheath, rub the core wire, and then connect the cable. Single-core cable: Strip off the sheath and connect the cable. |
| ... | ... | |
| AWG16 | 1.309 |
4.2 I/O Mode
Thermal resistance PT100 input mode
Current output mode
5. Description of PLC device
1. When connected to LX3 series PLC, please refer to LX3 series BD board manual.
2. When connected to LX5 series PLC, if the firmware version of PLC is lower than 2.051 (excluding 2.051), or BD board is not configured by host computer, it can be controlled by the following system devices:
3. User can select device through I/O mapping to use the configuration function of new BD board. For details, please refer to "6.1 Parameter configuration".
Device allocation
| PLC model | BD Model | Device | Description | Devices | Description | |
| LX5V | 2PT2DAI | SM2010 | CH1 thermal resistance input channel open flag | OFF: Open ON: Close | SD2010 | The temperature of CH1 at 0.1°C (-100℃ to 600℃: -1000 to 6000) |
| SM2011 | CH2 thermal resistance input channel open flag | SD2011 | The temperature of CH2 at 0.1°C (-100℃ to 600℃: -1000 to 6000) | |||
| SM2012 | CH3 current output channel open flag | SD2012 | CH3 digital value 0 to 2000: 4mA to 20mA | |||
| SM2013 | CH4 current output channel open flag | SD2013 | CH4 digital value 0 to 2000: 4mA to 20mA | |||
6. Instructions for use
6.1 Parameter configuration
① Open the host computer software and create a new project, in “Project Manager” → “Extended Function” , double-click "BD Board Configuration" Noteto enter “BD settings” interface;
② Configure the currently connected PLC (take the LX5V-2416 model as an example) and BD board model on the BD board configuration interface: Select “LX5V-2PTWDAI" in the device bar on the right side of the BD board configuration interface and double-click to add it to the corresponding slot position of PLC (slot number 1 or 2, the software will select slot 1 by default, and right-click to move down to slot 2);
③ After adding the BD board to the slot, double-click or right-click to select configuration parameters to enter LX5V-2PT2DAI-BD configuration parameters interface, as shown in the following figure. Configure related parameters on this interface.
Note: This function is only supported in the following versions of host computer, slave computer and BD board:
(1) Supported host computer software versions: Wecon PLC Editor2 2.1.204 and above, as shown in the following figure:
