I am having a problem fully understanding the MOV instruction..I wrote a program once with a start and stop(the stop being the DN bit of the timer) circuit on a 15 min timer turning on one output....I did it on one rung..Another guy did it similar but used a MOV instruction....I was wanting to know how did he do it...That will help me understand the MOV instruction better.....(RSLogix500).....Thanks

Without having more information on what was trying to be acomplished, it will be hard to answer this question. Generally I would not think of a mov instruction as something that would be used for turning outputs on and off. I guess it could be used that way... but why? Maybe it will help to talk about the MOV instruction. Probably the best way to get info about it is to add one into your program, put your cursor on it and press F1 for help. That will bring up the instruction help for the MOV instruction. It is a pretty simple instruction. It moves a register value from one location to another. So you could move the value in N7:0 to N7:1. If you put some logic in front of it, you can control when it moves that information. If you mov N7:0 to O:1 then you would be moving the value from the N7:0 register into an output word and could control outputs that way. Depending on which bits were set in the 16 bit N7 word, the corresponding outputs would come on. This is not an acceptable way to control your outputs in most cases.

Thanks for the reply.................... The program is for a water timer that shuts water on and off...You push input button i:0/1and it starts the 15 minute timer that is hard latched to output O:0/1..When the DN bit sets from the timer it drops out the latch to the input....Now can someone explain to me how would you use a MOV instruction in this very simple program and it still work....I have seen it done before...I just want to understand how it was done...Thanks