REF542 ModbuS and AC800M

HI,

- Is it possible to connect ABB AC800M (PM866) to ABB REF542 plus directly trough Modbus (com3 of CPU PM866) or it is only possible with CI853 ?
- Do we need any type of conversion between AC800M&REF542plus -like RS232/RS485- or not ?

Thanks in advance for your help.

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MAHBOUB-MANAF Rank: 1405

Asked 8 months ago

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Answers

Hi，

Com3 port on the cpu base is an RS232C serial port.In order to communicate with an RS485 slave，you must use an RS232 to RS485 converter.

Please check answer in below link for more details.

https://forum-controlsystems.abb.com/...

Regards
Rahil

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