This is a continuation of the series about Turning on PLC Outputs in Sequential Order. In the previous lesson, we refreshed your memory on the logic that we had written as well as the general idea of how we want the program to function. In this lesson, we are going to delete a little bit of code in order to take us back a little and get our program to the point when many started asking questions. We will then place the simulator into the single scan mode and rung by rung, troubleshoot the code and answer those questions for the RealPars audience. Let’s get started, shall we?
There may come a time in your career when you are called to investigate a malfunction in an existing control system that someone else has written. The field device documentation may be scarce or even nonexistent and you don’t know what field device belongs to which address. You could press each s...
In this lesson we are going to show you how to modify a value in the PLC. You are working on a new plant and you have a line of logic that is looking for a particular field device to be true before the logic will solve true but that field device isn’t yet installed. Let’s say that you need a valv...
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