problem with rs485 network


Thread Starter


I have an emergency problem with my network communication.

I have 4 HMI (DELTA brand) and one cpu (same brand SV type) and I want to make network to control my process line. (each HMI can send some commands to PLC)

is it possible to use RS485 for them or not? if yes or no what is the topology.

I thought it should has one master and other must be slave just to show events or messages but I want to send commands from each HMI panel.