WORKING WITH [FX2/FX2C]

[STORMRIDER]

I JUST FIGURED OUT THAT WHEN I WANTED TO MAKE SOMETHING HAPPEN, I PUT EVERYTHING IN PARALLEL AND THEN I HAD AN OUTPUT FOR WHAT I NEEDED. I STILL DIDN'T GET IT WORKING, BUT I GOT FARTHER THAN I WAS WHEN I GOT ON THE DANG THING. I UNDERSTAND MORE ABOUT AB, AND HOW TO MAKE IT WORK WITH TIMED OUTPUTS, THANK YOU FOR ALL THE INPUT. Edited November 6, 2005 by STORMRIDER

[Crossbow]

You cannot turn the same output on from 3 different rungs of ladder. The PLC processes the program from the top down. At the beginning it reads it's inputs, then it runs the program, and then it updates it's outputs. If you write this: -||-----() X0 Y0 -||-----() X1 Y0 The last one processed in the program will be the actual state of the output. So if X0 was on and X1 was off, Y0 would be off. If X0 was off and X1 was on, Y0 would be on.

[Guest Guest_STORMRIDER]

THANK YOU! I HAVEN'T HAD MUCH PRACTICE WITH A MITSUBISHI AND EVERYTIME I TRY TO DO SOMETHING I GUESS I THINK IT'S THE SAME AS ALLEN BRADLEY.

[Crossbow]

AB should process the same way, so I don't know why there would be a difference. Most PLCs process the program top down and then update the outputs. Same for Modicon, Mitsubishi, Siemens, and Omron. I odn't know a ton about AB, but the couple times I've written in RSLogix I know it doesn't like using the same output more than once either.