Dum question but!!!!

mer

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• Feb 3, 2010

• #1

i have direct soft5 software and was needing to know? if the condition in a rung is false what is the instruction to make the output true..thanks Dave...

 

bernie_carlton

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• Feb 3, 2010

• #2

It's the NOT instruction. But not all CPUs have it. the 130, 230 and 240 CPU's don't. Check your help file in DS5

 

TConnolly

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• Feb 3, 2010

• #3

In the absence of a NOT operator (INV on some AB PLCs) you can apply DeMorgan's theorem to invert your logic.

http://sites.google.com/site/automatedmanufacturingsystems/Home/boolean

 

Brian123

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• Feb 3, 2010

• #4

Or just change your output to an internal coil and add a rung with a STRN (store not, aka normally closed) and OUT to the original output.

Brian

 

TConnolly

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• Feb 3, 2010

• #5

Brian123 said:

Or just change your output to an internal coil and add a rung with a STRN (store not, aka normally closed) and OUT to the original output.

Brian

Click to expand...

Where's the fun in that?

 

bernie_carlton

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• Feb 3, 2010

• #6

OK MER you have at least 3 choices. Flip a three sided coin and have at it.

 

mer

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• Feb 3, 2010

• #7

Thanks all!!!

But wouldn't you knon it 230 cpu is what i got....