PLC Intro with codesys Software
small computers, dedicated to automation tasks in an industrial environment. Function Block Diagram (FBD) Sequential Flow Chart (SFC) Ladder Diagram (LD) Structured Text (ST) Instruction List (IL) Elementary Data Types Components of a PLC Inputs CPU Memory Outputs PLC Inputs and Outputs Analog, Discrete or Digital Protected by Optoisolators Sourcing and Sinking Communications PLC Operation Scanning is the process of running the PLC program Cycle time is the total time for one loop. Ladder Logic Compare a circuits diagram to a ladder logic diagram Ladder logic uses a variety of programming symbols Power always flows from left to right Output devices are in the ON state if power flows through them Contacts Contact programmed normally open Contact programmed normally closed
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