A complete guide to wiring PLC and remote I/O modules for inputs and outputs, whether they are AC, DC, or relay, with either sourcing or sinking operation. Wiring diagram for PLC modules and remote I/O terminals. Click on the image to see a high-res (printable 11x17. Digital input/output (I/O) modules are essential for factory and process automation, providing vital connections to a wide range of sensors and actuators. On the input side, they connect to simple push buttons, proximity switches and high-speed digital encoders. Every sensor reading, every motor start, every valve movement — all of it passes through the PLC's input and output modules. Understanding DI DO AI AO in PLC systems is the foundation of all PLC programming and automation. PLC and DCS control systems Wiring Diagrams for Digital Input (DI), Digital Output (DO), Analog Input (AI), and Analog Output (AO) signals. I/O Modules can be broadly classified into two groups: Those.
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