Output on until Input is off

[tony gast]

If you have a PLC make it the master of the universe.....making a robot wait.....that means money lost in cycle time
Put ALL logic in the PLC......Programmable LOGIC Controller
A PLC can latch a Pulse from the robot and remember.......you wont loose any signals unless the plc code is bad
The robot should only Wait for OK to go at any pick or entry points and
PULSE I am done...at drop and exit points....
I have done it many ways on many robot.....And to me.....That is the best, safest, easiest to debug....
why chase logic around in multiple machines.....

[flatcurve]

I agree. But like I said, my PLC guy is stuck in his ways, be they right or wrong.

[flatcurve]

I can't tell it to turn off an output once an input is off, or false in other words. Unless there's an elegant way around this that I just haven't seen yet. Ideas?

wait, I think I figured this out...

1: R[1]=1
2: IF (DI[1]), R[1]=(0)
3: IF (R[1]), DO[1]=(OFF)

That should work, right?

This doesn't work. Syntax error. Variable type mismatch.  

Trying again with flags instead of registers.

[flatcurve]

Okay, flags work. This is the solution to my original problem:

1: F[1]=(ON)
2: IF (DI[1]), F[1]=(OFF)
3: IF (F[1]), DO[1]=(OFF)

however it would appear that BG logic programs don't support Multi-lng remarks... Bummer.