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Modbus communication with ABB CMS-600

7/25/2018 1:22 PM	Rate (0)
ransu Posts: 2 Rating: (0)	I'm looking for advice on how to debug an ABB CMS-600 modbus communication any further. I'm using a Siemens S7-1200 PLC (1212 fw v4.2) with an RS485 module (CB1241) to read current values from CMS-600 via RS485 modbus-RTU. Reading the CMS-600 manual I have sent it the sequence of bytes it requires and confirmed by measuring the signal from the wires using an oscilloscope: This is what is sent to it: 01 03 00 00 00 01 84 0A 01 = address of CMS-600 03 = function for reading static registers 00 00 = reading sensor 1 00 01 = reading one register value 84 0A = CRC However the CMS-600 does not respond at all to this. Siemens error code status is 80C8 Slave not responding. However I can see that there is no response also with the oscilloscope The RS485 bus wires are only 10cm long, twister and terminated. I've tried different bus speed and parity setting but nothing works. Has anyone gotten this CMS to work with Siemens PLCs ? Attachment t2.png (84 Downloads)
ransu Posts: 2 Rating: (0)
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7/25/2018 2:16 PM	Rate (1)
Kaulquappe Posts: 3093 Rating: (324)	Hello ransu, possible reasons for error 80C8 are: - wrong baud rate / paritiy - wrong slave address and when using RS485: - wrong wiring (change R(A) and (B) to check it) Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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This contribution was helpful to 1 thankful Users Duris_I

7/26/2018 8:46 AM	Rate (0)
Duris_I Diamond Expert Joined: 4/28/2015 Last visit: 2/24/2025 Posts: 10832 Rating: (836)	Hello, maybe one test you can make completelly without termination.
	With best regards... Ivan Duris Flight: OMICO
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7/26/2018 9:13 AM	Rate (0)
ransu Posts: 2 Rating: (0)	Resolved. For some reason the wiring needs be to Siemens --- ABB T/RA --- B T/TB --- A Then it works.
ransu Posts: 2 Rating: (0)	Last edited by: ransu at: 7/26/2018 9:14:04 AM
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This contribution was helpful to 1 thankful Users Kaulquappe

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