CHANDRU, If you're company doesn't have any PLC's and you are going to be putting in your first one I would recomend that you DON'T use AB PLC's at all. I've been programing AB's for about 15 years now and its been VERY costly for everycompany that I've worked for. You almost need a liscence for each PLC type!! The cost is too high for the software and hardware in my opinion. There are a lot of other PLC's that are just as reliable that can do the job such as Keyence, Automation direct, CTC, Mitsubishi, and much more. There are also company's that sell PC I/O boards with Ladder logix software INCLUDED you just have to know some VB.Net or VC.Net. Besides AB PLC's stay aways from Omron, and Siemens.