The ABB NAIO-03 is an analog input/output (I/O) extension module.

• Analog: Unlike digital signals which are either on or off, analog signals represent a continuous range of values. For example, voltage can range from 0 to 12 volts, and the NAIO-03 can be used to measure or control voltages within that range.
• Input/Output (I/O): The module can both accept analog signals from sensors (input) and send analog signals to control devices (output).

A PLC module, or programmable logic controller module, is a building block used to create a programmable logic controller (PLC). PLCs are industrial computers used to automate electromechanical processes, such as assembly lines, robotic devices, or any activity that requires high reliability control and ease of programming and process fault diagnosis.

• Input modules: These modules receive signals from sensors and other input devices.
• Output modules: These modules send signals to actuators and other output devices.
• Power supply modules: These modules provide power to the PLC and its modules.
• CPU modules: These modules are the brain of the PLC, and they are responsible for processing instructions and controlling the operation of the other modules.
• Communication modules: These modules allow the PLC to communicate with other devices, such as HMI (human-machine interface) panels and other PLCs.

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