We're just looking at setting up a redundant ControlLogix chassis pair. The pair communicate to a single I/O rack via Ethernet/IP, and we will also have a SCADA system talking to the redundant chassis.
All the examples I've seen for redundant pair show 2x EN2T cards in the controller chassis. One card for the connection to the I/O rack. A separate card for connection to the SCADA/HMI.
Is this really necessary? or just 'best practice'?
I would've thought you could have just one EN2T card in each controller chassis. Then connect everything (SCADA, I/O rack, controller chassis) to a managed switch sitting in the middle. SCADA and I/O comms can be separated via VLAN.
Would this work, or have I missed something?
All the examples I've seen for redundant pair show 2x EN2T cards in the controller chassis. One card for the connection to the I/O rack. A separate card for connection to the SCADA/HMI.
Is this really necessary? or just 'best practice'?
I would've thought you could have just one EN2T card in each controller chassis. Then connect everything (SCADA, I/O rack, controller chassis) to a managed switch sitting in the middle. SCADA and I/O comms can be separated via VLAN.
Would this work, or have I missed something?