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2020/09
12 Technology Modules
12.1 Counter module – BL20-1CNT-24VDC 337
12.1.1 Technical features 337
12.1.2 Diagnostic and status messages 340
12.1.3 Base modules 341
12.1.4 Wiring diagram 342
12.1.5 Operation modes 343
12.1.6 Selecting counter or measurement mode 343
12.1.7 Count mode 344
12.1.8 Main count direction 355
12.1.9 Limit values of count mode 357
12.1.10 Measurement mode 366
12.1.11 Functions and explanations 381
12.1.12 Hysteresis for digital output DO1/DO2 386
12.1.13 Resetting of status bits 390
12.1.14 Transfer of values/load function 391
12.2 BL20-E-2CNT-2PWM – 2 counter-/encoders, 2 PWM-outputs 393
12.3 RS232 interface – BL20-1RS232 394
12.3.1 Data transfer method 394
12.3.2 Data exchange 394
12.3.3 Technical data 395
12.3.4 Pin assignment 397
12.3.5 Process input data 398
12.3.6 Process output data 400
12.3.7 Diagnostic and status messages 403
12.3.8 Module parameters 404
12.4 RS485/422-interface – BL20-1RS485/422 407
12.4.1 Data transfer method 407
12.4.2 Data exchange 407
12.4.3 Technical data 408
12.4.4 Base modules 410
12.4.5 Wiring diagram 410
12.4.6 Process input data 411
12.4.7 Process output data 413
12.4.8 Diagnostic and status messages 415
12.4.9 Module parameters 416
12.5 SSI-interface – BL20-1SSI 419
12.5.1 Data transfer method 419
12.5.2 Data exchange 419
12.5.3 Technical data 420
12.5.4 Base modules 421
12.5.5 Wiring diagram 421
12.5.6 Signal types – Pin assignment SSI 422
12.5.7 Process input data 422
12.5.8 Process output data 425
12.5.9 Internal registers - read and write operations 427
12.5.10 Diagnostic and status messages 432
12.5.11 Module parameters 433
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