Thursday, September 1, 2011

Secret Modbus Port on ABB Drives

Modbus communication is available built in standard on the ACS550. It is also available on the ACS355 with the FMBA-01 module added. But did you know there is an additional Modbus port available under the keypad on both drives?

With the keypad removed, the RJ45 port can be wired up to an RS232 Modbus master. (This connection is used for monitoring only and not start/stop control)


You can wire up the RJ45 port according to this diagram:


Serial settings such as station ID, baud rate and parity can be found in the Parameters section of the manual under Group 52. Valid messages as well as error messages can also be found in this section.




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