From the course: Learning Industrial Automation

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Main components

Main components

From the course: Learning Industrial Automation

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Main components

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- [Instructor] The main components of a PLC system are power supply, controller CPU, I/O system, inputs and outputs, and PLC programming software. Most PLCs need one or more power supplies for the CPU, and sometimes for the inputs and outputs. Usually, all the PLC manufacturers make a compatible power supply for their PLC. Controller or Central Processing Unit, CPU, is the brain of the PLC. The CPU reads signals and follows the instruction that a programmer has stored in the PLC memory. And according to the program, the PLC turns certain outputs or field devices. The CPU has different operating modes, programming and a run mode. And usually has LEDs or marquee showing on the controller module within the PLC to show what mode is the PLC currently operating. In a programming mode, the CPU accepts and download the logic from the PC. The CPU is then placed in a run mode so that it can execute the program and…

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