ControlLogix5563 scaling

Mtech · Aug 6, 2011

Hello,
I noticed that the controllogix doesn't have a SCP instruction. I would like to scale a value similar to how this instruction works. Does anyone know of a way too do this? I found a SCL but its in function block which I don't have. Bummer. Thanks.

Bob O · Aug 6, 2011

They provide an SCP AOI [Add On Instructions] in the samples that load with your software.
This assumes you had it load the samples and your version of 5000 allows AOI

Mickey · Aug 6, 2011

It might help if you understand exactly what that instruction (SCP) does. See links below

http://www.ronbeaufort.com/y=mx+b_part1.pdf

http://www.ronbeaufort.com/y=mx+b_part2.pdf

bernie_carlton · Aug 6, 2011

The derivation of slope and intercept is an exercise in elementary algebra. The application of the derived parameters takes two basic math operations. Why do some freak out if pre made function isn't available?

Ron's efforts cited are a great help.

Mtech · Aug 6, 2011

Thanks. That was what I was looking for. Now hopefully I can retain it. I'm sure I'll mess it up a couple times.

Ron Beaufort · Aug 6, 2011

if you can't get it worked out, just post the entries that you WOULD use if you did have an SCP available ...

we'll work out the equivalent formula and post it for you ...

(and thanks Mickey and Bernie - for the kind compliments) ...

Operaghost · Aug 6, 2011

bernie_carlton said:
Why do some freak out if pre made function isn't available?

I understand Bernie, but you know how it is, you get used to using the SCP in the SLC and you move to the 5000 and suddenly you don't have it anymore.

It's kind of like, sure I could work out the math manually but my pencil needs sharpening so I'll just use this nice calculator to do it for me. We get used to the tools we have.

OG

504bloke · Aug 6, 2011

The SCP is a really nice command, i miss it in many other plc makes, you just have to roll your own out and either cut and paste or add it to a library as a block

And Ron is the Guru

Mtech · Aug 6, 2011

Please, Here is the data I am wanting scale. Scale 1: Input min 80,Input max 105, Scaled min 0,Scaled max 32767. The other one is Scale 2:Input min 80,Input max 111,scaled min 0,Scaled max 32767. Thanks for the assistance.

Mickey · Aug 6, 2011

Here's the formula.

(((Scaled Max-Scaled Min)/(Max Raw Input-Min Raw Input))*(Raw Input-Min Raw Input))+Scaled Min = Scaled Value

Mickey · Aug 6, 2011

ControlLogix5563 scaling

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