15 MIN ON, 45 MIN OFF Timer - ML1400

rustydud · Sep 2, 2015

Hello all,

I am relatively new with using timers.
I need a timer that will cycle x minutes on and x minutes off while my program is active. Example - the timer is 15 minutes ON and 45 minutes OFF.
I am programming a Micrologix 1400 using RSLogix 500.
Is there a single timer that I can utilize for this function? If so, tips on how to make it work?

Thanks.

Mickey · Sep 2, 2015

Do you just want a timer to cycle 15 min on 45 min off? Or do you want an output (internal bit) to cycle off and on?

Have a self resetting timer with a 3600 second preset. Use limit instruction to turn on an output for 15 mins ( between 0-900 sec).

Search "Flasher"

http://www.theautomationstore.com/allen-bradley-plc-flasher/

Midwest Maverick · Sep 2, 2015

Logix Sample for 45min off 15 min on timer. Use timer1.dn bit to control whatever you're controlling.

rustydud · Sep 2, 2015

Ended up doing the attached.
Haven't tested it yet, however.
I think it works.
It's designed to have B99:1/0 turn on for 900 seconds, off for 2700 seconds, on for 900 seconds...etc

Firejo · Sep 2, 2015

Just for my curiosity, what is the goal of the application? It looks like you are starting a process that you want to run for 15 minutes, go off for 45 minutes, back on for 15, etc… If that’s the case I’d do it this way.

rustydud · Sep 18, 2015

Firejo said:
Just for my curiosity, what is the goal of the application? It looks like you are starting a process that you want to run for 15 minutes, go off for 45 minutes, back on for 15, etc… If that’s the case I’d do it this way.

Took me awhile to reply but this helped. Thanks!

15 MIN ON, 45 MIN OFF Timer - ML1400

rustydud

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