Rockwell Automation Analog Input Card Scaling Engineering Units

[@ShaneWelcher]

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[@gcinangidi4736]

This was very helpful. Thank you so much!

[@ShaneWelcher]

@@gcinangidi4736 Glad to help

[@TheLattimer35]

I have a question on a current problem. I have a program on v32 studio. It has scalable engineering units from the HMI, but they don't change the scaled value. They do change (write) to the low and high eng unit (in controller tags) in the PLC which is strange. Is it possible with a 1756-IF8H that is is only configurable from the module and downloaded? I've never seen this before... your video got my attention but this one doesn't quite fall into that...Ive created programs that eng units are changed on the fly and scaled value changes without issue....Thanks for any feedback. Reply

[@ShaneWelcher]

Depends on which system you are using on the HMI although yes, you can open the PLC program an change it in the I/O configuration very easily

[@TheLattimer35]

@@ShaneWelcher yes , it was an old SLC program that was migrated to contrologix. The problem was the old program had tags that were changing the Scaling and parameters block in program...it was never setup, so they were doing nothing...changed it on module just fine

[@yashwanthgowda6832]

I am using a 1756-IF16 module. From the field side, I am getting 4.01 mA (I checked at the module wiring and am getting 4.01 mA there as well), but the program value is showing 4.38 mA. What might be the reason for this.

[@ShaneWelcher]

@@yashwanthgowda6832 Depends on your meter or the card calibration

[@yashwanthgowda6832]

@ShaneWelcher any other way to know that

[@ShaneWelcher]

@yashwanthgowda6832 try a different meter

[@Jase877]

I’d add with scaling it’s normally off of what instrument you have connected, so if it was a temp or pressure instrument the 4-20ma would then represent the 0-10bar press or -50 to 1000degC temp.

[@ShaneWelcher]

Correct, that is why I am showing this simple setup. Scaling depends on the devices used & setup. Hope all is well.

[@Futbolnews12]

Thanks a lot for your videos Shane, What if we need to scale any mathematical value just like we used to with SCP (Scaling with partameters) with rslogix 500. That instruction is gone with Logix 5000. Any suggestion about scaling an analog value without SCP or SCL like the old times?

[@ShaneWelcher]

The SCL instruction is in function block in Studio 5000. You can also use it structured text. As far as Scale with parameters, that is a natural function of the I/O card so there is instruction for that. Then use a CPT instruction for anything you want to scale. Example of rate: (Scale_Max-Scaled_Min)/(Input_Max-Input_Min) If you prefer a one time use then you can make an Add on instruction

[@timkloehn9887]

The 1756 analog cards are the best because they give you more options in terms of diagnostics, alarm and clamping structure in the module defined structure. My 1794 analog remote module doesnt have those features.

[@ShaneWelcher]

They vary based on the rack used or part number like you stated. A 1756 chassis is generally the best the use. Although, all others will setup based on how they are ordered, example, either 4-20ma to 10 volts. Based on the chassis or rack used

[@Futbolnews12]

Got it!

[@ShaneWelcher]

Glad to help