carry flag

[renrut]

In Omron PLC programming I continuoulsy run across a cf?? input that needs to be turned on/off depending on situation. I have looked over the program and see no place that will trigger said input. Can anyone tell me what controls a carry flag.

Thanks

 

[Skogsgurra]

The obvious answer is: A mathematical operation. Like adding two numbers and the result is greater than the numerical range covered by the processor.

But there are other answers, too. Like you have a counter that overranges. Or anything like that. Have a look in the manual - it usually covers these things.

Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[renrut]

Maybe I am misunderstanding the concept here. Looking thru the instruction sheets on CX-Programmer I see a (CY) as a Carry Flag denotation. I am looking for a description of a (CF) input command. Nothing in these sheets that I can find. Could someone explain please?