The ABB SC513 is a Temperature monitoring relay.

A Programmable Logic Controller (PLC) is an industrial computer that is designed to control machines and processes in a factory or other industrial setting. PLCs are ruggedized and built to withstand the harsh conditions of an industrial environment, such as extreme temperatures, humidity, and vibration.

• Central processing unit (CPU): The CPU is the brain of the PLC. It is responsible for processing instructions, performing calculations, and making decisions.
• Input/output (I/O) modules: I/O modules allow the PLC to interact with the physical world. Input modules receive signals from sensors and switches, while output modules send signals to actuators and other devices.
• Power supply: The power supply provides power to the PLC and its components.
• Programming device: The programming device is used to create and edit the PLC program. The program is a set of instructions that tells the PLC what to do in response to different inputs.

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