COP instruction plc 5

jreyesm1988

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• Jun 15, 2016

• #1

Hello, i need help, I found this in a program that I working on it, I don't know what are they trying to do, help please

 

JohnCalderwood

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• Jun 15, 2016

• #2

looks like it is copying 500 words back one word from N7:325 to N7:324, not quite sure why...

Is there a word move into N7:325 that requires an indexing or history?
Maybe indirect addressing somewhere?

 

jreyesm1988

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• Jun 15, 2016

• #3

I look for indirect addressing but I find nothing, i just don't make sense to me

 

JohnCalderwood

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• Jun 15, 2016

• #4

In the program cross-reference, what do you have for N7:324 and N7:325?
Look for next 500 words after that too...

what are the pre-conditions that make that operation true?
Is it a step-on from a sensor, or a recipe value (HMI involved?)

 

Steve Bailey

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• Jun 15, 2016

• #5

Poor man's LIFO unload perhaps?

 

bernie_carlton

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• Jun 15, 2016

• #6

The previous rung is moving a value into n7:823, one word before the end of the group being moved by the COPY command.

 

JohnCalderwood

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• Jun 15, 2016

• #7

both rungs refer to "fall-thru" as though it is some form of index/indirect, or as you say LIFO type instruction before they were created....

 

jreyesm1988

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• Jun 15, 2016

• #8

This the complete rung

 

jreyesm1988

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• Jun 15, 2016

• #9

N12:0 is the output for a SQO instruction

 

kamenges

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• Jun 15, 2016

• #10

It is a form of tracker or data delay. The self-pulse bit will change state every time the file is scanned. So every other scan the COP is executed. The COP shifts the contents of the 500-word block starting at N7:324 down by one word every time it is executed. So something that is loaded into N7:823 will be present at N7:324 1000 scans later.

Keith

 

jreyesm1988

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• Jun 15, 2016

• #11

That's what it's, thanks a lot to all of you guys