All, This is a bit off topic here, but I hope I am not the only one who takes an interest in old process control systems. On 9/22/05, Ntec Solutions <ntec at btconnect.com> wrote: I can't say I have come across any Westinghouse programmable logic controllers yet and google isn't showing me anything enlightening. So all my advice is going to be quite generic. What are you replacing the PLC with? Have you tried contacting Westinghouse to see if it is possible to obtain the PLC programming software? Does the customer have any other documentation that may indicate the algorithms that are implemented in the PLC? Depending on what you are replacing the PLC with and even with the proper Westinghouse software, you may end up just being able to open the files on the customers backup and print them out. You are not guaranteed any equivalence of functionality by copying the program. If you are desperate to find the contents of the PLC program, use a hex editor or a simple ASCII editor (notepad) to open the file. Some of the older PLC programming software packages kept all their files in ASCII format. You may be lucky. Last suggestion. I am guessing you are upgrading the PLC for some reason, presumably with something a little more powerful than the original Westinghouse PLC. You may want to change the control algorithms to provide a better control of your process. Good luck. Simon -- ------------------------------------------------------------------------ "Well, an engineer is not concerned with the truth; that is left to philosophers and theologians: the prime concern of an engineer is the utility of the final product." Lectures on the Electrical Properties of Materials, L.Solymar, D.Walsh