Chunky said:
the Is are the ones that are normally open or closed in a ladder diagram and the Qs are the motors..
LOL, as I said, FIRST you need to learn what you have to work with and how it works.
I will be patient and explain some things, you responded earlier saying you had 2 DI and 2 DO with 24 Is and Q,s.
As I mentioned saying 2 DI means you have 2 digital inputs and 2 DO means you have 2 digital outputs; therefore the comments about Is and Qs made no sense. Your last response saying the Is were contacts in a ladder and Qs were motors also did not make sense.
Again I will try to explain. The internal programming (usually) has no limits on the number of internal contacts or coils you can use EXCEPT the limitations of memory for that plc. It may be possible that YOUR plc has these limitations BUT you need to know, understand, AND clearly state that when asking questions on a technical forum like this.
I know all this sounds harsh BUT you are in your final year before being an Engineer; shouldn't you be able to clearly state (explain) what you have, what you are going to do, and what you need?
I am not an Engineer BUT if ya can't talk the talk how will ya ever walk the walk?