Little help please

CraigJ · Sep 19, 2017

Hi all, looking for some assistance in how to write a small prog using CCW. I have a signal which pulses approximately every 1.5s for about 0.2s and i want it to switch on and latch an output with every other pulse. Any help would be appreciated.

Craig

Dirt · Sep 19, 2017

I don't know CCW but something like this? Would be easy to translate to ladder. Or STL.

CraigJ · Sep 19, 2017

Thanks but that doesn't seem to work. The output only pulses on and doesn't latch.

damica1 · Sep 19, 2017

If you don't need any timing of the output (just on every other time) then here is a simple way. I have not tested, but it may help get the upstairs thinking about different ways to solve a problem.(It is in CCW)

Dirt · Sep 19, 2017

Worked for me

Every odd pulse latches and every even pulse unlatches. It's important with the Edge-trigger. Can you post what you did?

damica1 · Sep 19, 2017

If you needed it to actually latch this should work for you.

CraigJ · Sep 19, 2017

Thanks, that works great. It was an up counter i was trying to use before i came begging here but was struggling with the reset. Thanks again.

Dirt · Sep 19, 2017

if Pulse and not Pulse_old and not Output then
Output:= true;

elsif Pulse and not Pulse_old and Output then
Output := false;
end_if;

Pulse_old := Pulse;

Also works

Little help please

CraigJ

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Dirt

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CraigJ

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damica1

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Dirt

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damica1

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CraigJ

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Dirt

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