What am i doing wrong?

jeepmadmike · Aug 23, 2006

I am just attempting to de-bug a new program with a analogue out (4-20mA)and i cannot get the value above 4mA.
The instruction im using is SCP and the output is scaled between 6242min and 31208 max for a input 0min 100max. what ever value the integer valve the o/p value remains at 6242

Ps its a AB micro logic plc and thanks for reading the post!

rPraveenkum · Aug 23, 2006

1.Controller in run mode?
2. Input condition is true?

Mickey · Aug 23, 2006

Zip your .RSS file and post it here (if you can) and someone will take a look

jeepmadmike · Aug 23, 2006

PLC is running and Rung is true!

Mickey · Aug 23, 2006

What ladder file is the SCP instruction in. If in something other then ladder 2, are you calling that subroutine.

jeepmadmike · Aug 23, 2006

it is in a different ladder does that cause problems?

rPraveenkum · Aug 23, 2006

program containing SCP Inst shoud be called using JSR INST

jeepmadmike · Aug 23, 2006

I see i just moved the rung to ladder 2 and it now works. thanks for your help guys. i must find the time to go and study PLC's in depth

Ken Moore · Aug 23, 2006

It makes sense to place different sections of code in different ladder files to make trouble shooting easier. I use unconditional sub routines all the time, just for that purpose. Ladder file 2 is usually very small with many sub routine calls.

Here's an example of an unconditional call:

The U:4, will call ladder file 4.

Hope this helps.

What am i doing wrong?

jeepmadmike

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rPraveenkum

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Mickey

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jeepmadmike

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Mickey

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rPraveenkum

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Ken Moore

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