Introduction to PLC Programming and Implementation (11)


Program coding is the process of translating a logic or relay diagram into PLC ladder program form. This ladder program, which is stored in the application memory, is the actual logic that will implement the control of the machine or process.

Ease of program coding is directly related to how orderly the previous stages (control task definition, I/O assignment, etc.) have been done. Figure 21 shows a sample program code generated from logic gates and electromechanical relay diagrams (internal coil 1000 replaces the control relay). Note that the coding is a PLC representation of the logic, whether it is a new application or a modernization. The next sections examine this coding process closer and present several programming examples.

to be continued………….


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