Find Maximum/Minimum Integer

[obi1987]

I assigned different values to pump(1,2,3) and these numbers I assigned to pump is status of pumps.Now i want to do which comes in first will first off.So how i can find the Maximum and Minimum of Pump states?

 

[daba]

You didn't mention what your PLC make and model is.

Without that information, it is hard to advise the best method.

 

[obi1987]

I am using Compact logix and software is Rslogix5000

 

[TConnolly]

Max := Pump1
If Pump2 > Max then Max:= Pump2
If Pump3 > Max then Max:= Pump3.

Do the same for minimum.

For large quantities in an integer array you can use a SORT. Then the min and max are at each end of the array.