Hii Steve, Thnks for the quick response. I have some queries though. Like I have to perform ethernet communication(redundant). So can u tell me what would be the communication protocols that i have to use.....like i/o device type, port, board and other parameters which come when we click on the communication tab in the CITECT SCADA. Also like GE PLCs have addressing in the form of %R00010, but when writing it in CITECT it gives error on compilation.......it is not taking that address it takes address like I1, Q1, AI1 or AO1. So can you explain if this would work. I have not been able to start work on it or test it as we need a permit and it wld take some time but i wld like to clear all my doubts before starting the work........ Once thnks for quick reply.......