Interpretation Ladder schema (flow direction)

[jpam 0]

Hi, i want to know if in this schema the inputs "enclav" and "pe" will set the output "Tpm_Eq" or only will reset the "Boc_aut" Output. I think the current flow in ladder goes from left to right, but I´m not sure, can anyone help me?

[PLCRune 2]

This will also set Tpm_Eq" You are correct. It reads the program from rleft to right

[drx 2]

Hi, Absolutely not. For Enclav being true, Boc_Aut will be reseted without having Tpm_eq set. This is a usual trick used with these PLC, and the evaluation of the rungs are from top left, to bottom right, as if reading traditionnal japonese, where eval is for evaluation : eval 1 ; eval 4 ; eval 7 eval 2 ; eval 5 ; eval 8 eval 3 ; eval 6 ; eval 9 So there is no backtracing evaluation, you can consider it evaluating left to right if you wanna think it the easy way, but what you have here (line 57) needs a right to left evaluation that cannot happen. Good luck. Edited 21 Oct 2013 by drx