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S7-1200 Modbus RTU With Inverter

7/8/2013 2:47 PM	Rate (0)
Juan.Mechatronic Posts: 98 Rating: (6)	Hey all, I'm trying to conect a S7-1200 with CM 1241 RS 422/485 Module, I have to make a communication with an Mitshubishi Inverter FR D700 They have to conect with Modbus RTU protocol, the thing is that I'm making some test without success. I took this 2 examples as reference: https://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=en&objid=47755811&caller=view https://support.automation.siemens.com/es//llisapi.dll?func=cslib.csinfo&objId=63696870&nodeid4=34677186&load=content&lang=en&siteid=cseus&aktprim=4&objaction=csview&extranet=standard&viewreg=US I don't know if there's something wrong. From hot line I receive this Pin conections : S7 1241 -- FR-D700-EC PIN 2 T(B) -- PIN 6 R(B) PIN 9 T(A) -- PIN 3 R(A) PIN 3 R(B) -- PIN 4 T(B) PIN 8 R(A) -- PIN 5 T(A) PIN 5 GND -- PIN 1 / PIN 7 Some ideas wath can be happening? Hardware configuration? Hope someone can help Thanks In Advanced
Juan.Mechatronic Posts: 98 Rating: (6)
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7/8/2013 3:11 PM	Rate (0)
SolutionFinder Posts: 559 Rating: (87)	Check your baudrate settings, Parity, Done bit Etc. Also check the address in drive.
SolutionFinder Posts: 559 Rating: (87)
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7/8/2013 3:29 PM	Rate (0)
Juan.Mechatronic Posts: 98 Rating: (6)	SolutionFinder Check your baudrate settings, Parity, Done bit Etc. Also check the address in drive. I cheked Baud rate, parity, done etc, but without succes The drive's address are ok I'm using the adress number 2,3...to 10 'cause i have many inverters to test. But there's no answer, the leds indicators show that CM module try to send data and busy status change true but the "Done" bit never change true. I'm trying at least read holding registers (40001,40002, etc) but doesn,t seems to success I wonder if there's something special with Data_PTR on MB_MASTER FB
Juan.Mechatronic Posts: 98 Rating: (6)
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8/6/2021 11:26 AM	Rate (0)
Phan van linh Advanced Member Joined: 7/21/2018 Last visit: 6/23/2022 Posts: 53 Rating: (0)	Hi Friend! you use pin 3 and 8.. frd700 pin6 +pin4 and pin3+pin5 Linh

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8/6/2021 3:36 PM	Rate (0)
danw Gold Expert Joined: 3/28/2010 Last visit: 3/21/2025 Posts: 1126 Rating: (219)	Is the Mitshubishi Inverter FR D700 RS-422 or RS-485?

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