I am using Rslogix 5, and Rslogix 500 PRO With 500 PRO I am able to use (logic trace) In Rslogix 5 std I do not have this function. Does anyone know if there is an add-in, that I can purchase or download, that can be used with Rslogix5? Question 2; Can someone show me or illustrate how to write a macro that will do the same function as logic trace? LOGIC TRACE= back space or forward to previous position. This is a very handy tool while troubleshooting. Thanks