SCP for Logix 5000

highvoltage8471

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• Mar 18, 2014

• #1

What does Logix 5000 use for the SCP instruction(Scale with Parameters) other than in Function Block or Structured Text. Is there any instruction for ladder? Or is there another way to scale some analog sensors that I am receiving through device net into the processor?

 

Donnchadh

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• Mar 18, 2014

• #2

Hi

There is an Aoi for ladder it's in the ab web site for download I think it's n the sample code section


Donnchadh

 

Mickey

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• Mar 18, 2014

• #3

Do the math..

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

 

widelto

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• Mar 18, 2014

• #4

Go to:
http://search.rockwellautomation.co...ie=UTF-8&ud=1&exclude_apps=1&site=sample_code

SCP AOI.

 

daba

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• Mar 18, 2014

• #5

HV8471 - You only said it was Logix5000, you didn't say which platform, ControlLogix, CompactLogix, FlexLogix, DriveLogix, or SoftLogix.

If it is ControlLogix, then you can put the analog channel scaling directly on the module, and they will then interface to your control system in Engineering Units without the need for any supporting code.

 

highvoltage8471

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• Mar 19, 2014

• #6

Thank you all for the options

 

mrsoliveira

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• Mar 20, 2014

• #7

Mickey said:

Do the math..

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

Click to expand...

Hi!

This sample can be used with negative Scaled range?

For example
Input: 7186
Input Min: 4000
Input Max: 20000

Scaled Min: -1.0
Scaled Max: 4.0

Scaled Value:???

Thanks for help!
Oliveira

 

Mickey

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• Mar 21, 2014

• #8

This sample can be used with negative Scaled range?

Click to expand...

Yes. Test it.

 

daba

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• Mar 21, 2014

• #9

mrsoliveira said:

Hi!

This sample can be used with negative Scaled range?

Click to expand...

Yes, Mickey wants you to test it, but I'll state that it is the same math as used internally in the SCP instruction itself.

The four parameters lock the conversion straight-line, which will stretch "to infinity" both ways, and "doing the math" will allow any input value, even if it is outside of the min/max range.

The SCP instruction behaves in exactly the same manner, give it an input value outside of the min/max input range, and the output will be outside the Eng Units min and max values.

 

Mickey

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• Mar 21, 2014

• #10

Here is a useful tool created by John Soltesz

 

The Plc Kid

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• Mar 22, 2014

• #11

Kinda surprised Rockwell has not added this in as logix has been out so many years.

In some cases I would like it better than on module scaling. Also it would help when doing conversions from PLC5 AND SLC 500 Systems.

Something I will hit up the Logix 5000 product managers with at this years RS Tech Ed.

 

jerry.carter@smithse

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• Jun 22, 2018

• #12

I realize this thread is very old but maybe someone can help. I'm a novice logix5K user and now have to convert some antiquated micrologix 1500's to Compactlogix. The SCP instruction is not available in 5K and I am attempting to use the AOI. My question is: What goes in the first entry box?

 

OkiePC

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• Jun 22, 2018

• #13

You need to create tags of the data type "SCP". When you imported the AOI, Studio 5000 should have also created the UDT (User defined data type) called SCP, so it should appear among the choices when creating tags.

 

AMarks95

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• Mar 25, 2022

• #14

jerry.carter@smithse said:

I realize this thread is very old but maybe someone can help. I'm a novice logix5K user and now have to convert some antiquated micrologix 1500's to Compactlogix. The SCP instruction is not available in 5K and I am attempting to use the AOI. My question is: What goes in the first entry box?

Click to expand...

SCP is now an AOI, so it requires an instance to run. The first box is your instance tag. This is the most annoying inconvenience of it being an AOI instead of an instruction.

 

Operaghost

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• Mar 25, 2022

• #15

AMarks95 said:

SCP is now an AOI, so it requires an instance to run. The first box is your instance tag. This is the most annoying inconvenience of it being an AOI instead of an instruction.

Click to expand...

I don't understand your annoyance...if I create a timer instruction, I have to create a timer tag. If I use an AOI I have to create the AOI tag type. Right-click, new tag, give it name, done. The AOI isn't any easier or more difficult to use than a timer.

OG