AC500 as Modbus RTU Slave with multiple masters
We have multiiple modbus masters(3 nos. AC800PEC and some 3rd party Controllers).
and an AC500 PLC as slave.
as we know AC500 CPU has 2 COM ports and each can be configured as modbus rtu slave.
I want to know that can we add any additional slave module with AC500 CPU and how can we assign and read memory address individually for each master?
Is it possible or we do have multiple AC500 CPU as modbus RTU slave?
Voted best answer
It is posible to add a communication module called CM574-RS. This module has 2 extra com port which can be configured as modbus.
There are 4 communication slots and 2 seriel slots so for the PM57x and higher you can have up to 10 modbus rtu slaves on 1 cpu.
Each slave can configures so it has different memory areas which can be write protected. Then you are sure that you dont write in a wrong place.