Skidood

OK awesome..thanks...I think I will be good.

I think that as the program executes, and travels along its merry way, any one output is never controlled by another part of the program but I am adding a potential crash, since I am wanting to command an output that may already be unlatched by some other program step. 

Hmmm..you lost me at  "that changes the memory location in the output table"    The program has about 25 instances of this 1 particular output being latched or unlatched under certain conditions or parts of the execution cycle..the machine runs a very elaborate program for being in a 1200.   The rung I am adding monitors a float switch during the whole program execution and has to activate an output (actually 2 not 1)  whenever  the float switch input is OFF.  I'm an amateur...so...I assume the attached graphic depicts a latched output.   (oops there is supposed to be a "L" in the brackets below)   

Hi,  I have a MicroLogix 1200 and an existing program. I need to add a rung where one of the outputs gets energized when a certain input is ON, (its a float switch)  and de-energized when the input is OFF. However, the same output is being latched OFF  by other instructions in the program at certain  times.  What would happen if I add my rung which may at times command this output ON while it is currently unlatched  by another part of the program?   Will the program  execution fault out/hang?