In these modern times, the manufacturer's use of the PLC PC Software for PLC programming. The most commonly used is called ladder programming logic. The use of symbols and not of relay contacts logic words to simulate control logic PLC, which is the Legacy of the story. These symbols to indicate the Interconnection Lines (eg through contacts and relays of Coil Current) .With the passing of TWO Years, increased the number of symbols, and provide a high level of functionality.
To complete the program It looks like a ladder, but in truth it represents a circuit. Instruction guide Or the positive power supply and grounding. Among the various cascade connection components which, in the case of PLC, all components are in the CPU in the Virtual world.Therefore, if you are able to understand the principle of operation of a basic circuit, you can understand the logic of Ladder.
The simplest example (for example, the Digital Input card turned On at the first position of the button) to open a UMA output, Power Indicator Light.
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