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Old February 13th, 2018, 05:31 AM   #14
sparkie
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sparkie is offline
 
Join Date: Nov 2014
Location: KS
Posts: 748
The reason I can't just use a Click as a modbus gateway is because these tanks will be grouped by 10's, and they will be adding tanks in off numbers, such as 3 or 4 at a time as they get them up and running and expand. So I feel the best route would be to keep each RS-485 network separate, and use a modbus gateway at each group of tanks. Then the PLC and SCADA systems can use eithernet. This enables me to significantly reduce the amount of wire that must be pulled to each panel. We can, for instance, use a single 20A circuit for power at each set of tanks and an ethernet wire to the gateway. Everything else is local to the tanks.

However, you are on to something. If I use a small click panel at each set of tanks, I have less distance to run instrument wire, and can use the click as the gateway. I would have to set up the polling times for info, and work a little handshaking magic, but that might be the best way to go.
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