Plant air system

[thiagan]

Need to write a program to operate two compressors to compress air to one receiver with one pressure switch one stop switch and one start button, air to be compressed once you press the start button and thes motors to run alternatively and indefnitly using only the very basic ladder logic. timers / counters etc.
Ta

 

[Tom Jenkins]

You want alternator logic. Search the site - I think this has been done before here.

 

[leitmotif]

See other post here
Using 4 to 20ma output transducers w/h PLC

Dan Bentler