The ABB DSTA155 is a connection unit used in the ABB S100 programmable logic controller (PLC) system.

It acts as an interface between the PLC and its input/output (I/O) devices.

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.

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