Please help!

I am wondering if anyone can help? I am working with an AB pico mini plc. I want to make the output relays normally closed( open on an input fault condition)

Thanks!

Turn on the output when there is NOT a fault condition.

What does it look like?

Can you show it for me?

For the Allen-Bradley Pico PLC, it would look like this: (Notice the line right above the I01 input, which indicates a "Break" contact (on when physical input is off).

Maybe you could help with the whole project? I have five inputs. Four of them have the same function. If any of these four inputs "open", then I would like the output Q1 to open as well. In addition, I would like to display a text descriptor for each input when in fault. The fifth input will open outputs Q1&Q2, as well as display a text descriptor. I want the outputs to latch open until the I8 contact is mOmentarily closed ( reset button).
The outputs must be closed until an input is opened

Can you show it for me?

You have almost fully described the program in "pseudo-code".

I suggest that you replace the terms "open" and "closed", which might apply to physical switches, and use "True" or "False", which apply to the Boolean data types for both inputs and outputs.

Describe exactly what you mean by "text descriptor"; are you talking about a text object on the Pico (is it a GFX model ?) or something else ?

It would help to post the whole part number of the Pico controller and which software you're using with it. That way if somebody posts a Pico program in its native format (not a screenshot) you can open it correctly.

One thing you'll find here on the Forum when learning (and especially when doing homework) is that the help you get is proportional to the effort you display. Go ahead and post a screenshot of how *you* think the logic might look.

I am using a pico 1760-L12BWB. By text descriptor I mean using a text display that is shown on the display of the pico.
I am just posting with my I-phone so I can't post what I have so far...

Thankyou for any and all help!

My contribution: here's how I would latch a "fault detected" marker bit M1 in the event of any of the I1 through I5 inputs going false.

You'll need another rung to detect I5 going false itself, since that has a separate meaning.

And you'll need one rung each to control Q1 and Q2.

I got it!!!!

Thanks for all your help!!!