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The terms software and firmware both refer to digitally stored programs and data structures that are read and written by computers. In the PLC world, software is usually reserved for computer applications that allow the logical creation, monitoring, and troubleshooting of a PLC program. One example of PLC software is the RSLogix program developed by Allen-Bradley for use with their controllers. Firmware can be referred to as the actual Read more…

The operation of a PLC is very simple. The processor makes decisions based on a ladder logic program written by the user. In order to use the program properly, the PLC must communicate with the various field devices it is tasked with monitoring and controlling. It then compares the actual conditions of the field devices with what the program instructs them to do, and updates the output devices accordingly. Read more…

PLCs

Programmable logic controllers, or PLCs, are used to automate processes in industry. In the 1960s, the computerized processor replaced the relay logic control system. With the widespread use of PLCs in today’s Read more…