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How to write a PLC step sequence program

Define a machine's control modes, main cycles and sequence steps before a program is written, or you'll just write scatter code and confuse others

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Many programmers in the automation industry struggle with what is the best way to write a PLC program for machine automation. There are also many programmers who know the best way or right tool to use and proceed to use many of the IEC 61131 programs on a single machine. Whether it's the inexperienced or the experienced writing the PLC program, simple ladder logic and a step sequence is often the best solution. No doubt there are arguments for using a variety of programming methods to control a machine, but breaking down a machine cycle into modular pieces of code and defining the automatic sequence steps before writing a single line of code is a great starting point.

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