Hi everyone,

I want to start off by saying I'm new to PLC logic/programming. I have programmed a lot in JS, PHP etc and have some basic arduino experience, but zero PLC

I have found an old LOGO! 0BA5 and decided it is time to try out some stuff.

What I want to do is this:

* I have two 24V solenoid valves to shut off compressed air to two different parts of my warehouse.

* I want to have three pushbuttons: one to control solenoid A, one to control solenoid B and one to control them both (eventually I will put a timer on this)

* The logic of the third button should be as follows: when A and B are open, shut them both, if they are both shut, open them both. If only one of them is open, shut down that one, leave the other one shut.

* The third button will not be in the same location as the other two, so I need the third button to have control without having to go to the other buttons.

* I want to have a simple LED indicatorlight to show if valve is open or shut

I have tried some messing around with flags in logo soft in a FBD, but I can't seem to figure out how the flags work. I see the logic in my head in programming form, but just can't translate it to a FBD.

Could one of you direct me in the right direction, because resources about flags are sparce online.

Thanks in advance

Thank you very much! This is exactly what I need. I will spend the remainder of the day working out the logic behind this so I get a better understanding of FBD's.

Thanks again