RS485 Connection to AC800F ABB DCS

A

Thread Starter

Anil

Hi.

Could anyone let me know why the RS485 have to be terminated? In the DCS there are 3 options: a) Internal Termination, b) External Termination with internal supply, c) External termination with external supply.

Plz let me know which has to be choosen & why.

Cheers
Anil
 
Hello

Each bus system needs to be terminated.

This all to exclude reflections on the bus cable. which can cause communication loss on the bus system
 
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