reseting timers

Hojland · Jul 11, 2007

I have 5 timers. When the first one is finest, it starts the next one. But in which oder shut they reset one and other. I mean the fist one is started by an input. the second one is stated by the first.and so on. Shut the second on reset the first one. They shut just go over and over again. Pleas help fast

dchartier · Jul 11, 2007

Hello Hojland;

Please specify the model of PLC and software you are using, each manufacturer has his own special way of programming his timers. That way you will probably get help from someone here who works with your brand of PLC.

But generally a timer can be reset as soon as it has completed its timing period, making sure that the trigger is also not active at that moment.

Hope this helps,
Daniel Chartier

RoTaTech · Jul 11, 2007

Is this relay logic? PLC logic? Which PLC?
What is it SUPPOSED to do?

I envision it as:

IF input AND NOT timer2, THEN timer1

IF timer1 AND NOT timer3, THEN timer2

etc.

Is this correct?

Ken Moore · Jul 11, 2007

Don't know which platform you are using, but in AB land, you would have the fifth timers not done bit in the logic for the first timer. Then when the fifth timer times out, it would reset the first timer, the first timer's done bit would go false, which would reset the second timer, and so on.

Here's an example of four cascading timers:

The done bit in ladder 0000 shoud be T4:3.DN

Hojland · Jul 11, 2007

sorry guys. it is a micrologix 1100 and rslogix software

atifplus · Jul 11, 2007

could you plz post you logic or program screenshots and requirements .

Hojland · Jul 11, 2007

Thanks guys. I will try doing the same as Ken.

atifplus · Jul 11, 2007

Ken Moore said:
Don't know which platform you are using, but in AB land, you would have the fifth timers not done bit in the logic for the first timer. Then when the fifth timer times out, it would reset the first timer, the first timer's done bit would go false, which would reset the second timer, and so on.

Here's an example of four cascading timers:

The done bit in ladder 0000 shoud be T4:3.DN

So it is like a one big timer made of small timers .. ?

bernie_carlton · Jul 11, 2007

Ken - shouldn't the conditioning contacts in rungs 1-3 by XIC instead of XIO?

rsdoran · Jul 11, 2007

Wondering about that. If the timers should sequence then start the sequence over then Ken's method is the easiest, here is another way to do it. NOTE: Either way what ever starts the timing sequence must stay true to maintain the sequence.

nettogrisen · Jul 11, 2007

If you're having trouble explaining your problem in engilsh, shoot me a mail on [email protected] and I'll help you

Ken Moore · Jul 11, 2007

bernie_carlton said:
Ken - shouldn't the conditioning contacts in rungs 1-3 by XIC instead of XIO?

Good catch, I threw that together really fast, and didn't catch it.

keithkyll · Jul 11, 2007

atifplus said:
So it is like a one big timer made of small timers .. ?

A better term is Sequencer. In some programming packages, they have an instruction called 'Drum'. It simulates the timer in your washing machine, dishwasher, etc.
Automation DIrect has a Drum instruction if you want more info. Without a Drum, you need to cascade timers to make a sequencer.

reseting timers

Hojland

Member

dchartier

Member

RoTaTech

Member

Ken Moore

Lifetime Supporting Member

Hojland

Member

atifplus

Member

Hojland

Member

atifplus

Member

bernie_carlton

Lifetime Supporting Member + Moderator

rsdoran

Lifetime Supporting Member

nettogrisen

Lifetime Supporting Member

Ken Moore

Lifetime Supporting Member

keithkyll

Member

Similar Topics