PLC input and output interfaces

The programmable controller is a digital computing operation of electronic systems, specialized applications in industrial environments. It uses memory can be programmed, used in instruction execution storage logical and sequential control, timing, counting and arithmetic operations such as operations and digital or analog input (I) and output (O) through the interface, to control various type of machine or production process.
Interface Plc modules and the electrical circuit is output through the input section (I / O) to complete. plc IO module integrates the PLC's I / O circuit, the input register reflecting the input signal, the output point to reflect the state of the output latch. Input module into the electric signal into a digital signal the PLC system, the opposite output module. I / O into the digital input (DI), switching output (DO), the analog input (AI), analog output (AO) modules.