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Old December 20th, 2017, 02:16 AM   #3
willxfmr
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willxfmr is offline
 
Join Date: Nov 2013
Location: Wisconsin
Posts: 269
My first question would be what HMI software are you using FactoryTalk SE would make this pretty simple. Well... As easy as FactoryTalk makes anything else. But I agree with cjd1965. An HMI in a central location for monitoring, and as many as need to handle the local changes at the vats would be my first choice. Each HMI would be used to display information from, or give information to the PLC. All of the control programming should be handled in the PLC.

A type J thermocouple should work fine. If you want to bring the signal back as 4-20 you could use an RTD with a converter built into the unit. There may well be such a device for the thermocouple as well, but I'm not aware of one.

Bubba.
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“Now will come the nay-sayers with all the reasons why you shouldn't do this. Some of them are teachers, and some of us are doers. Besides, you have got to let the smoke out of this equipment every now and then, or it starts to clog up the chimney.”
~Lancie1
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