Detailed explanation of the detailed steps of PLC and inverter communication-EEWORLD

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1. Find an S7-1200PLC with RS485 communication module and a V20 inverter.

2. Connect the RS485 module to the V20 inverter. The wiring method is to connect the red wire to P+ and the green wire to N-.

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3. Set the inverter parameters of V20.

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4. Create a TIA Portal project and upload the S7-1200PLC hardware configuration.

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5. Set the parameters of the RS485 module. The communication parameters of the module must be consistent with the communication parameters set in V20. I set them to 9600, 8, even.

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6. Add Modbus communication instructions.

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7. Change the mode parameter in the initialization instruction background DB to 4.

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8. Program test, motor Normal start and stop, where the modbus address 40100 is the command source, 047E is stop, 047F is forward, 0C7F is reverse, the address 40100 is the frequency source, 16#0-16#4000 corresponds to 0Hz-50Hz.

9. You can check whether the communication is successful by observing the communication indicator light of the module. If TX and RX flash alternately, the communication is successful.

1. Find an S7-1200PLC with RS485 communication module and a V20 inverter.

2. Connect the RS485 module to the V20 inverter. The wiring method is to connect the red wire to P+ and the green wire to N-.

picture

3. Set the inverter parameters of V20.

picture

4. Create a TIA Portal project and upload the hardware configuration of the S7-1200PLC.

picture

5. Set the parameters of the RS485 module. The communication parameters of the module must be consistent with the communication parameters set in V20. I set them to 9600, 8, even.

picture

6. Add Modbus communication instructions.

picture

7. Change the mode parameter in the initialization instruction background DB to 4.

picture

8. Program test, the motor starts and stops normally, where the modbus address 40100 is the command source, 047E is stop, 047F is forward, 0C7F is reverse, the address 40100 is the frequency source, 16#0-16#4000 corresponds to 0Hz-50Hz.

9. You can check whether the communication is successful by observing the communication indicator light of the module. If TX and RX flash alternately, the communication is successful.

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