Remote I/O refers to input/output (I/O) modules that are located remotely from the central control system, often a PLC or other controller. These modules gather data from sensors and control actuators in the field and communicate this information back to the central controller over a network, such as Ethernet, serial, or wireless connections. This allows for distributed control and monitoring of processes, reducing wiring costs, and enabling control of equipment located in remote or hazardous locations. Common uses include monitoring and control of water treatment plants, oil and gas pipelines, and industrial automation systems where sensors and actuators are spread over a large area.
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