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Connecting more than one modbus slave over Panel Ethernet


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When I try to create two Modbus TCP/IP slaves I get the following error:

"Both Slaves have been set to the same communication protocol. Slave1 may be set to TCP/IP, while Slave2 is set to RS485"

I don't understand why it gives an error if I have different IDs for each slave.

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It´s a normal behavior.

If you want your PLC act as slave (named server in Modbus TCP), you configure it under PLC Communications | Protocols | MODBUS | Slaves, either Ethernet or RS485. Then, it will be another slave in the network.

If you want your PLC act as a master (named client in Modbus TCP), you must configure all your slaves under PLC Communications | Protocols | MODBUS | Masters, either Ethernet or RS485. Then, it will be the master in the network. All slaves must have unique IP (Ethernet) or ID (RS485).

 

 

 

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