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Arun Opto 22

Analog Scaling in RSLogix 5000

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I have a CompactLogix PLC with an 1769-IF8 AI Card. My level transmitter is a 4-20mA, and my tank level can be between zero and 35 gallons. In RSLogix 5000 I see what is called "Engineering Units" for the card configuration simply is 4,000 to 20,000....this to me in a sense is still "counts" - because in ladder I'd still have to do something to match 4,000 to 0 gallons and 20,000 to 35 gallons, right? What should I use in Ladder? I've read in the forum for a similar question that someone recommended a CPT block. I'm not sure how I'd use that to do my scaling. Any suggestions on specifics for the CPT block or another way to do my scaling? I have to imagine this is done everyday by a lot of you out there (I'm new to A-B). Thanks. Arun

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Slight Improvement. Add two checks to this CPT LES TankLevel 0 Mov 0 Tanklevel GRTTankLevel 0 Mov 35 Tanklevel The 1769-IF8 actually goes 3200 to 21000 when in 4 to 20 mode. Anything under 3.2 ma reports as 3.2 and anything over 21 reports as 21.

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Be careful, clamping signal can give the illusion that level sensor is perfectly calibrated at all times.

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Thanks Guys. Awesome. One last follow up question: If I had a ControlLogix with a 1756 AI...I wouldn't need to do this, right? It looks like perhaps you can take care of this at module configuration in RSLogix 5000...? Thanks, Arun

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