LX3V-2WT - Wecon

= **1 Weighing module Operating principle** =

Electrical resistance of metal material changes in proportion to the forces being applied to deform it. The strain gauge measures the deformation as a change in electrical resistance, which is a measure of the strain and hence the applied forces (load).

4

5

= **2 Introduction** =

6

7

1. WECON LX3V-2WT expansion module’s resolution is 24-bit. The module can be used for reading signals from 4- or 6- wire configuration;

8

1. Please read through the manual before powering on the module.

9

1. This manual is only applicable for model number: LX3V-2WT. Please double check the mark on your module.

10

1. Using FROM/TO command to read/write data on PLC LX3X.

11

12

== **2.1 Specification** ==

13

14

(% class="table-bordered" %)

15

|**Item**|**Description**

16

|Channel|Double channels

17

|A/D converter|24 bit Δˉ∑ A/D

18

|Resolution|24bit (signed)

19

|Speed|7.5/10/25/50/60/150/300Hz available

20

|Polarity|Unipolar and bipolar

21

|Non-linearity|≤0.01% full scale(25^^o^^C)

22

|Zero drift|≤0.2μV/^^ o^^C

23

|Gain drift|≤10ppm/^^ o^^C

24

|Excitation Voltage/ load|5V, load impedance≥200Ω

25

|Sensor sensitivity|1mV/V-15mV/V

26

|Isolation|Transformer (power supply) and the optical coupler (signal)

27

|Lamp|Power supply lamp, communication lamp

28

|Power supply|24V±20% 2VA

29

|Operating temperature|0~~60^^ o^^C

30

|Storage temperature|-20~~80^^ o^^C

31

|Dimension|90(L)x58(W)x80(H) mm

32

33

== **2.2 Valid bits** ==

34

35

Refer to sampling frequency in Section 5.2, Chapter 5 of this manual.

= **3 Dimensions** =

(% style="text-align:center" %)

40

[[image:LX3V-2WT V2.0_html_894c15a18e7135f3.png||class="img-thumbnail" height="384" width="1000"]]

41

42

① Extension cable and connector

43

44

② LED COMM: Lit when communicating

45

46

③ Power LED: Lit when power present

47

48

④ State LED: Lit when normal

⑤ Module number

⑥ Analog signal output terminal

53

54

⑦ Extension module interface

55

56

⑧ DIN rail mounting slot

⑨ DIN rail hook

⑩ Mounting holes (φ4.5)

61

62

63

(% style="text-align:center" %)

64

[[image:LX3V-2WT V2.0_html_6b5398f61ad44c3d.png||class="img-thumbnail" height="199" width="300"]]

65

66

1. Use the crimp terminals that meet the dimensional requirements showed in the left figure.

67

1. Apply 0.5 to 0.8 N.m (5 to 8 kgf.cm) torque to tighten the terminals against disoperation.

68

69

(% class="table-bordered" %)

70

|**Terminals**|**Instruction**|**Terminals**|**Instruction**

71

|24V+|Power supply+|24V-|Power supply-

72

|GND|Grounding|FG1|CH1 sensor grounding

73

|E1+|CH1 power supply+ (5V) for sensor|E1-|CH1 power supply- (5V) for sensor

74

|S1+|CH1 signal output+ of sensor|S1-|CH1 signal output- of sensor

75

|F1+|CH1 feedback+ of sensor|F1-|CH1 feedback- of sensor

76

|E2+|CH2 power supply+ (5V) for sensor|E2-|CH2 power supply- (5V) for sensor

77

|S2+|CH2 signal output+ of sensor|S2-|CH2 signal output- of sensor

78

|F2+|CH2 feedback+ of sensor|F2-|CH2 feedback- of sensor

79

|FG2|CH2 sensor grounding|(((

*

)))|

= **4 Wiring** =

(% style="text-align:center" %)

86

[[image:LX3V-2WT V2.0_html_fca48acd721ccf71.png||class="img-thumbnail" height="468" width="600"]]

**✎Note: **

1. Impedance of the weighing sensor is greater than 50 Ω.

91

1. Sensors with 4 wires need to have E1+ and F1+ connected, E1- and F1- connected.

92

93

= **5 BFM instruction** =

94

95

== **5.1 BFM list** ==

96

97

(% class="table-bordered" %)

0: bipolar

(((

5: 150 Hz;

6: 300 Hz;

7: 600 Hz;

8: 960 Hz;

9: 2400 Hz;

1: unipolar

)))

)))

0: 7.55 Hz;

1: 10 HZ;

2: 25 Hz;

3: 50 Hz;

4: 60 Hz;

)))

b0: CH1 no-load;

b1: CH2 no-load;

b2: CH1 overload;

b3: CH2 overload;

b4: CH1 measured value is stable;

140

141

b5: CH2 measured value is stable;

b6-b15: Reserved;

BFM 44: Reserved;

)))

It is the data register for all error states, and each error status is displayed in the corresponding bit, possibly with multiple error states

0: No error;

1: Error;

b0: Power supply error;

b1: Hardware error;

b2: CH1 conversion error;

159

160

b3: CH2 conversion error;

161

162

B4 :CH1 input calibration parameter error

163

B5 :CH2 input calibration parameter error

Other bit: Reserved;

BFM45: Reserved;

)))

Use average weight as tare weight:

0: Disabled

1: Set tare weight then reset to 0;

Others : Reserved;

)))

Display gross weight or net weight

0: Gross weight;

1: Net weight;

Others: Channels invalid;

)))

Defaulted to 0

0x0001:Channels 1 set to 0

191

192

0x0002:Channels 1 calibrating:

193

194

0x0003:CH1 without weight

195

196

calibration

197

0x0004:CH1 modified calibration

parameter error

Step1: Remove all load ;

202

203

Step2: BFM #8 (#48) set to 0x0001;

204

205

Step3: Add known weight;

206

207

Step4: Write known weight to BFM#23 (#63);

208

209

Step5: BFM #8 (#48) set to 0x0002;Calibration without weight:

210

211

Step1: Do not put any weight on the load cell;

212

213

Step2: Write the maximum range of the sensor to #23;

214

215

Step3: Write the sensor sensitivity to #39, accurate to three decimal places;

216

217

Step4: The value of #8 is written as 0x0003.

218

219

Modify calibration parameters:

220

221

Step1: Modify the calibration parameter values in BFM#35~~BFM#38;

222

223

Step2: The value of #8 is written as 0x0004.

224

225

Remark: After writing the value to BFM#8 using the device monitoring, it will be automatically reset to 0.

)))

#49: Keep unused

1: Reset CH1; 2: Reset CH2

231

232

3: Reset all channels

Other: No action

)))

0: Zero tracking disabled

240

241

Other: Intensity of zero tracking

)))

0: No limit

Others: Up limit

)))

0: Disabled;

1: ±2%MAX;

2: ±5%MAX;

3: ±10%MAX;

4: ±20%MAX;

)))

0: < 1V/V

1: < 125mV/V

2: < 62.5mV/V

3: < 31.25V/V

4: < 15.625mV/V

5: <7.812 mV/V

Note: Please recalibrate after setting

273

274

(This function only is available in Software & hardware version 13904 or later)

275

)))

276

277

|17|57|(% style="width:159px" %)Average weight H|(% style="width:486px" %)Average weight (High word)

-2147483648~~

2147483647

)))|(% rowspan="2" style="width:486px" %)User can write or read tare weight by command #7

284

|20|60|(% style="width:159px" %)Tare weight H

285

286

|22|62|(% style="width:77px" %)O|(% style="width:101px" %)R/W|(% style="width:159px" %)Stability inspection range|(% style="width:82px" %)1|(% style="width:92px" %)1-100|(% style="width:486px" %)If the stability check range is set to 100 and the stability check time is set to 200ms, then the current weight fluctuation range is within 100 and lasts for 200ms, then the value is considered stable, otherwise it is considered unstable, and the stability flag is displayed on BFM#4

-2147483648~~

2147483647

)))|(% rowspan="2" style="width:486px" %)(((

292

Please refer to #8

293

294

With weight calibration, enter the weight base point weight, without weight calibration enter the sensor range

295

)))

296

|24|64|(% style="width:159px" %)Weight value adjustment H

-2147483648~~

2147483647

)))|(% rowspan="2" style="width:486px" %)User can set the max value, it will record the error code when measured value exceed set value

302

|26|66|(% style="width:159px" %)Maximum H

-2147483648~~

2147483647

)))|(% rowspan="4" style="width:486px" %)(((

308

Zero weight detection function, used to tell if all loads have been removed.

309

310

Reading of the bit to indicate stable reading becoming 0 means all loads have been removed.

)))

|28|68

-2147483648~~

2147483647

)))

|30|70

0: Default, disable additional functions;

321

322

1: Enable filter reset function.

Other: Reserved

)))

Enable filter reset function:

0: Default;

0~~100: The number of sampling cycles to wait for the filter to restart.

332

333

The value collected during the accumulation of the average, as the initial value of filtering

)))

-3.402823E+38~~

3.402823E+38

)))|(% rowspan="4" style="width:486px" %)(((

342

Explain by CH1:

343

344

After modifying the calibration parameters, #8 does not write 4, which is only displayed, not used for weight value calculation, and does not save after power off; #8 After writing 4, if the parameter range is correct, write and save it for weight value calculation 4 Error code Bit4 is set to 0, if the parameter range is wrong, no write operation will be performed, #4 error code Bit4 is set to 1.

)))

|36|76

-3.402823E+38~~

3.402823E+38

)))

|38|78

The default setting of 2000 represents 2mV/V, and calibration without weights needs to set the sensor sensitivity accuracy. The sensitivity range can be set to 0~~32.767mV/V, the sensor sensitivity BFM#39 enters a negative value, and it is directly converted to 32767 for execution.

355

356

Example: Modified to 1942 means 1.942mV/V.

)))

Write:

0: do not display

1: Real-time display of current sensor feedback voltage

364

365

2: Display the zero point voltage during calibration

366

367

3: Display the voltage of the weight applied during calibration

Read:

Display the low digit of the voltage value in uV.

)))

Read:

Display the high digit of the voltage value in uV.

)))

**✎Note: **

1. O: yes;

1. X: no;

1. R: read;

1. W: write;

== **5.2 Buffer (BFM) description** ==

387

388

* **BFM0: Module code**

389

390

LX3V-2WT V3 code: 5012

391

392

* **BFM1: module version**

393

394

Module version (decimal)

**Example**

BFM1=120, means V1.2.0

* **BFM2: Polarity**

For bipolar, the signal will go through zero while it is in changing process, but unipolar will not. The result of the conversion from analog value to digital value is signed, so for bipolar signal the value could be minus.

403

404

* **BFM3: Sampling frequency**

405

406

The frequency of input signal reading, the lower the frequency is, the more stable the value it gets, and the higher the precision is, but the lower speed gets.

407

408

(% class="table-bordered" %)

409

410

|0|7.5|23.5|5|150|21.5

|1|10|23.5|6|300|21

|2|25|23|7|600|20.5

|3|50|22|8|960|20

|4|60|22|9|2400|17.5

* **BFM4: State code**

417

418

(% class="table-bordered" %)

419

|(% rowspan="2" %)**Bit No.**|(% colspan="2" %)**Description**

420

|**1**|**0**

421

|Bit 0|CH1 no-load|CH1 load

422

|Bit 2|CH1 over-load|CH1 not over-load

423

|Bit 4|CH1 stable|CH1 unstable

424

|Bit 6|CH1 uncalibrated/calibrated error|CH1 calibration successful

|(((

Bit 8

Bit 9

)))|(((

00: no error

10: The base point of the weight is too heavy

433

)))|(((

434

01: No-load calibration

11: Not calibrated

)))

|Bit 12|(((

CH1 exceeds the sensor range

440

441

Note: Determined by sensor feedback voltage

442

)))|CH1 within the sensor range

443

444

* **BFM5: Error code**

445

446

(% class="table-bordered" %)

447

448

|bit 0|K1(H0001)|Power failure|(% colspan="2" %)bit 1|K1(H0001)|Hardware failure

449

|bit 2|K4(H0004)|CH1 conversion error|(% colspan="2" %)bit 3|K8(H0008)|CH2 conversion error

450

|bit 4|K16(H0010)|CH1 write calibration parameter error|(% colspan="2" %)bit 5|K32(H0020)|CH2 write calibration parameter error

451

|Other|(% colspan="3" %)Reserved|(% colspan="2" %)BFM#45|Reserved

452

|(% colspan="7" %)**✎Note: **The data register that stores all error states. Each error state is determined by a corresponding bit. More than two error states may occur at the same time. 0 means normal and no error, and 1 means there is a state.

453

454

* **BFM6: Tare weight setting**

455

456

Set the current weight value (BFM16-17) as a tare (BFM19-20) weight. Every bit represents a different channel, which is set to 1 to mean enabled, reset to 0 after being set.

457

458

**Use CH1 as example**

459

460

The current weight is 100, after setting tare weight;

461

462

If it displays gross weight (BFM7 = 0) currently, the tare weight (BFM19-20) will become 100, the current weight is still 100;

463

464

If it displays net weight (BFM7 = 1), the tare weight (BFM19-20) will be original value + current weight value, the current weight value becomes zero;

465

466

* **BFM8: Adjust the weight command. User adjustment steps: (describe with CH1)**

467

468

There is a weight calibration:

469

470

Step1: Do not put any weight on the load cell;

471

472

Step2: #8 value is written as 0x0001;

473

474

Step3: Add standard weights to the load cell;

475

476

Step4: Write the weight of the current weight on the chassis to #23;

477

478

Step5: The #8 value is written as 0x0002.

479

480

Calibration without weight:

481

482

Step1: Do not put any weight on the load cell;

483

484

Step2: Write the maximum range of the sensor to #23;

485

486

Step3: Write the sensor sensitivity to #39, accurate to three decimal places;

487

488

Step4: The #8 value is written as 0x0003.

489

490

Modify calibration parameters:

491

492

Step1: Modify the calibration parameter values in BFM#35~~BFM#38;

493

494

Step2: The #8 value is written as 0x0004.

495

496

Remarks: After using the device monitoring to write a value to BFM#8 or BFM#48, it will automatically reset to 0.

497

498

* **BFM11: filtering strength**

499

500

The higher the filter strength is, the more stable and accurate the weight value is. But the delay time will increase accordingly, and the sensitivity will decrease.

501

502

* **BFM12: zero tracking strength**

503

504

Zero-tracking is to have a constant 0 when there’s no load. Zero tracking intensity means the weight counts 0 when it’s within the range to reduce the influence of temperature drift.

505

506

(% class="table-bordered" %)

507

|**Setting**|**Description**|**Note**

508

|0|Zero tracking OFF|Default

509

|1-200|Range of weight value|10 means ± 10

510

|Others|Reserved|

511

|(% colspan="3" %)**✎Note: **This feature can be disabled when high precision is not required.

512

513

* **BFM13:Range of Zero tracking**

514

515

Accumulated range of zero tracking, stop tracking when out of range

Table 5‑6

(% class="table-bordered" %)

520

|**Setting**|**Description**|**Note**

521

|0|Disable zero tracking|Default

522

|1-300|Range of weight value|10 means ±10

523

|Others|Reserved|

524

|(% colspan="3" %)**✎Note: **This feature can be disabled when high precision is not required.

**Example**

Setting value is 100, when the position within ± 100, it will be read as no-load.

529

530

* **BFM15: Set AD chip gain**

531

532

It can be set according to the sensor range

533

534

(% class="table-bordered" %)

535

|**BFM15**|**Voltage range**|**Sensor sensitivity**

536

|0|± 5V|< 1V/V

537

|1|± 625mV|< 125mV/V

538

|2|±312.5 mV|< 62.5mV/V

539

|3|±156.2 mV|< 31.25V/V

540

|4|±78.125 mV|< 15.625mV/V

541

|5|±39.06 mV|<7.812 mV/V

542

543

== **5.3 Function Instructions** ==

544

545

**Net weight measurement**

546

547

It can be set to measure net weight or gross weight. The Net weight means the weight of the product itself, that is, the actual weight of the product without its external packaging.

548

549

The weight of the packaging is called the tare weight. The gross weight is the total weight, namely the net weight plus the tare weight.

550

551

1. Tare weight: weight of the packaging

552

1. Net weight: the weight of the product, excluding the packaging.

553

1. Gross weight: the net weight plus the tare of the product.

554

1. Gross weight= net weight + tare weight.

**Example 1**

A product weighs 10kg and the carton contains it weighs 0.2kg, then its gross weight is 10.2 kg (net weight=10kg, tare weight=0.2kg, gross weight=10.2kg)

**Example2**

Use the measured value at CH1 as the net weight. If you know the weight of the packaging already, you can skip the step of reading tare weight.

563

564

* Read the tare weight

565

566

Step 1: Write H0000 into BFM7.

567

568

Step 2: Place the packaging on the CH1 load cell.

569

570

Step 3: Write H0001 into BFM6 to take the weight of the packaging as the tare weight.

* Set BFM7 = H00F1.

**Standstill check function**

575

576

When an object is placed on the load cell to measure its weight, you can use the standstill check function to know whether the current reading has been stabilized.

577

578

* If the measured value shifts within the range (BFM 22) of standstill check set up by the user, BFM4’bit 4 will be set to “1”.

579

* If the measured value shifts beyond the range for standstill check set up by the user, bit4 will be set to “0”. They will be set to “1” again when the range is returned to the set range.

**Example**

The measuring time is 10ms, the times of standstill check is 10, and the range for standstill check is 1,000. When the range for standstill check exceeds 1,000, the reading is considered unstable, i.e. BFM4’bit4 will be set to 0. When the measuring time is within 100ms (10 × 10ms) and the range returns to be within 1,000, BFM4’bit4 will be set to 1 again. We recommend you check if the measured value is stable enough before operating it.

584

585

* **Zero detection function**

586

587

Users can use this function to know whether the object has been removed from the load cell. If the BFM4’bit4 is 1, and the BFM4’bit0 and bit1 are 1 as well, the object has been removed from the load cell already, and you can proceed to the next step.

* **Filtering**

This setting is used to exclude noises from the readings, which are introduced by environmental factors.

= **6 Example** =

* **Current state of weight**

596

597

(% style="text-align:center" %)

598

[[image:LX3V-2WT V2.0_html_6bc45b23c2b79282.png||class="img-thumbnail" height="77" width="500"]]

599

600

Read the current state BFM4. More information, please refer to __[[5.2>>path:#_5.2_Buffer_(BFM)]]__

601

602

* **Get current weight value**

603

604

(% style="text-align:center" %)

605

[[image:LX3V-2WT V2.0_html_5f4a500276a0a3a0.png||class="img-thumbnail" height="66" width="500"]]

606

607

Write average weight value (BFM16) to D0

608

609

* **Calibrating weight**

610

611

(% style="text-align:center" %)

612

[[image:LX3V-2WT V2.0_html_c4b24548535207d3.png||class="img-thumbnail" height="252" width="500"]]

613

614

Step 1: Remove all weights;

615

616

Step 2: Write 0x0001 to #8;

617

618

Step 3: Add known weights;

619

620

Step 4: Write known weights (D2) to #23;

621

622

Step 5: Write 0x0002 to #8

623

624

*In the new version, the step 1 can be used for manual reset.

625

626

Adjustment and calibration are to make sure the weight values of module and the heavy load units of module to be consistent.

627

628

* **Tare weight and gross weight**

629

630

(% style="text-align:center" %)

631

[[image:LX3V-2WT V2.0_html_5b9b9b62d33c4a7e.png||class="img-thumbnail" height="293" width="500"]]

632

633

Set value as tare weight by writing K1 to BFM6

634

635

Set the value as Net weight by writing K1 to BFM7

636

637

Set the value as gross weight by writing K0 to BFM7

638

639

* **Filter method and strength**

640

641

(% style="text-align:center" %)

642

[[image:LX3V-2WT V2.0_html_187c088ffaacd7f1.png||class="img-thumbnail" height="194" width="500"]]

643

644

Set filtering by writing value to BFM10

645

646

Set filtering by writing value to BFM11

647

648

After setting the filtering mode and filtering strength, need to calibrate again.

* **Zero tracking**

(% style="text-align:center" %)

653

[[image:LX3V-2WT V2.0_html_9b603f9448600b12.png||class="img-thumbnail" height="196" width="500"]]

654

655

Zero tracking is used to reduce the temperature drift interference;

656

657

Set Zero Tracking Intensity to 0 to disable tracking. Set Zero Tracking Range to 0 to make it is unlimited.

658

659

* **Calibration without weights**

660

661

Calibration without weights is performed by the zero point of the sensor and the maximum range of the sensor. The accuracy is related to the sensor specifications and depends on the sensor sensitivity (mV/V).

662

663

Example: The sensitivity of LAB-B-B sensor is 2.0±10%mV/V, and there may be a maximum error of 10%, so it is best to use a sensor with a small sensor sensitivity error to use this function.

664

665

(% style="text-align:center" %)

666

[[image:LX3V-2WT V2.0_html_735f5d0ddc4d01c3.png||class="img-thumbnail" height="391" width="500"]]

667

668

(((

669

Step1: Write the sensor range in D8 to BFM23:

670

671

Example: measuring range 3kg, D8 value setting 3000

672

673

Step2: write the sensor sensitivity in D9 into BFM39:

674

675

Example: Sensitivity: 1.942mV/V, D9 value set to 1942;

676

677

Step3: write value K4 to BFM8 and confirm to write calibration parameters.

678

)))

679

680

* **Modify calibration parameters**

681

682

Step1: Write the floating point number in D10 into BFM35~~BFM36;

683

684

(((

685

Step2: Write the floating point number in D11 into BFM37~~BFM38;

686

687

Step3: Write value K4 to BFM8 and confirm to write calibration parameters.

688

689

(% style="text-align:center" %)

690

[[image:LX3V-2WT V2.0_html_592dd08d03d2ad0d.png||class="img-thumbnail" height="259" width="700"]]

691

)))

692

693

**✎Note:** BFM35, BFM36, BFM37, and BFM38 are real number types (float). Real numbers need to be input when inputting. If the input exceeds the range, BFM5 will report an error in writing calibration parameters.

= **7 Diagnosis** =

== **7.1 Check** ==

1. Make sure all cables are connected properly;

700

1. Make sure all rules regarding LX3V expansion modules are met. Such as expansion modules other than digital inputs and outputs are no more than 8 in total. The total number of digital inputs and outputs are no greater than 256.

701

1. Make sure to select the correct operating range in application;

702

1. Make sure power supply is working properly;

703

1. LX3V CPU unit is in RUN mode;

704

705

== **7.2 Check the error** ==

706

707

* If the special function module LX3V-2WT V3 does not operate normally, please check the following items.

708

709

Check the status of the LINK indicator

710

711

Flashing: The extension cable is connected correctly

712

713

Otherwise: Check the connection of the extension cable.

714

715

* Check the status of the "24V" LED indicator (upper right corner of LX3V-2WT V3)

716

717

Lit: LX3V-2WT V3 is normal, and the 24VDC power supply is normal.

718

719

Otherwise: the 24V DC power supply may be faulty. If the power supply is normal, it is LX3V-2WT V3 fault.

720

721

* Check the status of the "COM" LED indicator (upper right corner of LX3V-2WT V3)

722

723

Flashing: Value conversion is operating normally.

724

725

Otherwise: check buffer memory #5 (error status).

726

727

If any bit (b0, b1, b2) is ON, that is why the COM indicator is off. Detailed description

728

729

Please refer to "(6) BFM5: Error Code" in "5.2 Buffer Register (BFM) Description" in "Chapter 5" of this manual.

730

731

* Check the sensor and measure whether the voltage between S+ and S- is less than (5*sensor sensitivity) mv. The sensitivity of the sensor can be found on the sensor manual, and the unit is (mv/v). If the voltage at this point exceeds the range, it means the sensor Deformation or wiring error occurred. Measure whether the voltage between F+ and F- is 5V. If it is not 5V, check the sensor wiring.

Wiki source code of LX3V-2WT

Navigation

Table of Contents