CPT Instruction

[outlaw9801]

I am trying to add 15 items together using a cpt instruction in logix5000. All of the items are in the same array is there a way i can type in the first tag and be able to type in like L12 and get it to add all of them up without adding every tag in.

 

[Ron Beaufort]

check out the FAL instruction instead ... it's pretty "heavy duty" for what you're trying to do - but I think that it's the answer that you're looking for ...

basic idea: you can think of the FAL (File Arithmetic Logic) instruction as something like a CPT instruction - with a built-in For-Next loop that can "cycle" through an array ...

 

[outlaw9801]

Thanks I'll Try That

 

[daba]

If the elements are contiguous within the array, you can get the SUM of them easily by multiplying the AVErage of them by the number of items.

AVE = SUM / LEN

SUM = AVE * LEN

EDIT : The -(RES)- is there so the AVE is performed every scan, and doesn't need a false-to-true rung transition to re-trigger it.

2nd EDIT : Source B in the MUL would be better as AVE_Control.LEN. Then you can manipulate the number of items to SUM, and the MUL will follow it.

 

[chavak]

If the elements are contiguous within the array, you can get the SUM of them easily by multiplying the AVErage of them by the number of items.

AVE = SUM / LEN

SUM = AVE * LEN

EDIT : The -(RES)- is there so the AVE is performed every scan, and doesn't need a false-to-true rung transition to re-trigger it.

2nd EDIT : Source B in the MUL would be better as AVE_Control.LEN. Then you can manipulate the number of items to SUM, and the MUL will follow it.

Thats a neat trick, thanks for sharing:beerchug: