Theuns

Thank You Gambit i am quite new to profybus and only used it twice on the Q series plc , i had a look in both programs and i found the relevant bits that they use over the profy network. Thanks a lot. 

Hi aakash device memory is used when there is a power failure etc set by the developer for the program or lets say process  etc. to continue when power is restored if u made a backup of the program for reasons unknown like plc failure etc that would be fine. If however u want to reload the program lets say while halfway trough process or such situation u will have to set the relevant bits etc manually

if i am understanding you correctly you want to use a word or double word to turn on or off outputs ?