Help with problem please. This is an omron plc (CP1L) cx programmer.

[Tony chacon]

In the hand position:
Pumps 1 and 2 are controlled and alternated by the hand selector switch. When Hand position is first selected, pump 1 will run, then turn off when OFF position is selected. The next time the hand position is selected, pump 2 will start and run until OFF position is selected. The pumps will alternate in this fashion. Only one pump is to be on at one time.

 

[iant]

Welcome to the site
This is normally a student question.
There are heaps of posts so please search the site.
look at the Keep function help
also consider the counter function.
as far as using a HAND selector with alternative pump use.
this would be very bad practice as you may be wanting to test that pump.
normally C/O is in AUTO only

 

[King-snorre]

If you use greather then function block you can switch between the different pumps, we did this in school a year ago and it worked very good, only problem is when one of the pumps crashes...
then it will not work.