Stig
Member
I am using one Red Lion G310C2 HMI to control 2 Idec FC5A PLC's. What I am wondering is how the HMI decides which is PLC1 and which is PLC2. Both PLC's are running basically the same ladder program for 4 ovens (2 ovens per PLC). However one is monitoring 3 freezers, and the other is monitoring 5 freezers, so the program only differs with the number of inputs monitoring the freezers. How should the PLC's be connected to ensure the proper commands from the HMI reach the correct PLC? I have already designated which PLC the commands go to on the HMI controls.
What I am thinking: HMI-RS485<-->PLC1<-->Idec FC4A-ENET<-->ethernet switch<-->PLC2
Or do I: HMI-RS485<-->PLC1<-->PLC2<-->Idec FC4A-ENET<-->ethernet switch.
Or even: HMI-RS232<-->PLC1, and HMI-RS485<-->PLC2
Eventually all of our PLC's and HMI's will be connected to a large network able to be monitored from set locations and with pass through programming.
What I am thinking: HMI-RS485<-->PLC1<-->Idec FC4A-ENET<-->ethernet switch<-->PLC2
Or do I: HMI-RS485<-->PLC1<-->PLC2<-->Idec FC4A-ENET<-->ethernet switch.
Or even: HMI-RS232<-->PLC1, and HMI-RS485<-->PLC2
Eventually all of our PLC's and HMI's will be connected to a large network able to be monitored from set locations and with pass through programming.