Time Based Outputs

racbdlovr · Dec 4, 2013

I am running RSLogix 5000 and I need to program outputs to trigger every 90 minutes. I have 7 production lines that stagger their start times. I need to write a program that reads the clock of the processor and triggers an output every ninety minutes after the production line starts. I have no idea where to start. Any help I can get on this will be much appreciated.

robertmee · Dec 4, 2013

I personally wouldn't use the Wallclock time. It would involve math/conversions to handle second, minute, hour and day rollovers.

Why not just use a 90 minute timer (TON)? Pretty basic logic, where a starting event turns on a timer with a preset of 5400000 msecs. The timer can be latched in with the Timer.TT bit, and the .DN bit fires your output and starts the next timer if needed.

rdrast · Dec 5, 2013

Go ahead and use the wallclock time.
Put a DTR instruction on the Minutes register, and use that to drive a counter (or just an ADD 1 SomeRegister SomeRegister), then use the counter current value to trigger your starts:
EQU SomeRegister 90 OTE GoOne
EQU SomeRegister 180 OTE GoTwo
etc.

VictorBit · Dec 5, 2013

robertmee said:
I personally wouldn't use the Wallclock time. It would involve math/conversions to handle second, minute, hour and day rollovers.

Why not just use a 90 minute timer (TON)? Pretty basic logic, where a starting event turns on a timer with a preset of 5400000 msecs. The timer can be latched in with the Timer.TT bit, and the .DN bit fires your output and starts the next timer if needed.

I would have done the same

Time Based Outputs

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