3 phase motors sample code

[jeffellis1 0]

I have some questions about the sample logic for the 3 phase motors sample code. 1. Rung 2, I:2/15, PB_STOP, which is a normally closed pushbutton, shouldn't this be a NO? I am trying to figure this out. Sorry if the answer is right in front of me. This is how we learn. thanks, Edited 18 May 2006 by jfls41

[Smoke 0]

When working with PLC logic think of the contacts as true's and not true's. yes its not on or yes it is on. 1. The physical push button is N.C. The logic is looking for it to be open to stop the system or "true its not closed". When the operator pushes the N.C. button it will then be open and the system will stop. 2.When the system is not running and you push the start button B3:0/0 latches and motor 11starts. When M11 has ran for 1 sec. then M10 start etc. until M1 starts. After M1 starts the system running bit B3:0/1 is latched and the system start request is unlatched. I hope this helps Edited 18 May 2006 by Smoke