Selector Switch With Multiple CLICK Programs.

Hello, beginner here.

We have a mobile cart at the plant I am interning at. Right now it has a single program on the CLICK PLC. They want it so that you can use a selector switch (Still needs installed) to switch between two different programs. I know I will have to combine them into a single program but I am not sure exactly how to do it. Would each program be a different subroutine? What would the main routine look like?

Thanks in advance!

There are several ways... but if they are small, just use bits a the start of the rungs, so for example your switch (X002) will make C2 true or false, so by adding C2 to each rung you can have that rung be true or false, then when you flip the switch to the other position C2 will open and if you used a normally closed C2 on your other program then it now would be true

One question would both programs be using the same I/O? if yes then you would need to have two subroutines and call them with the position of the switch

Something to add... It is a four position selector switch. We want to be able to switch between the two programs (Position 1 and Position 2), and have Position 3 disable the part locking mechanism of the first program. Sorry if my wording is confusing.

These are my current subroutines: http://prntscr.com/jzis6o

Whats in your main program? thats where you should call your Sub's from

Be careful with conditional subroutines. If you stop calling a subroutine, it will not turn off "coils" that were set to "1" during the previous scan and so there will usually be some extra steps required to make it work.

Conditional subroutines can make sense and be the right way to go, but in my experience, it is pretty rare that conditional routines make for the best fit.

Depending on the differences between the 4 "programs" you might find a cleaner solution by simply selecting different source data for a sequencer or control algorithm.

OkiePC said:

Be careful with conditional subroutines. If you stop calling a subroutine, it will not turn off "coils" that were set to "1" during the previous scan and so there will usually be some extra steps required to make it work.

Click to expand...

The way I have done it in the past is to have all the outputs in the main (not in the sub's) and have a first scan setup to set everything back to 'zero' when the switch changes states (turned to another position)