hello,

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Split from CM1241 Modbus RS-485 crash?.

 You should check the Modbus Address for the drive. I think address is a WORD. So you may need to access the right bit in this WORD for the drive to start. You can also try using a PC Modbus software and verify the command whether it works or not?

nedjm

hello,

I have a question about the communication between a module CM 1241 RS422 / 485 and a speed controller ABB ACS550, I made the parameters of drives following the manual and I wrote a program with zero error (16 # 0000) and the leds of the module CM1241 blinks (ie there is a communication) but the problem is that I made a MB-Master to control the Start / Stop of the drive, so I wrote MB_ADDR 1 and MODE 1 and DATA_ADDR 40001 and DATA_LEN 1 and DATA_PTR DB_on (on = bool), when I made the connection and I went to the DB and I forced the value of "on" in TRUE, it does nothing

I think the trick is at the address level, your help please