IO module, also known as the PLC control module

plc IO module is also called a control module, can be output when the control request signal or a switching signal to plc communication module‍ operation of the controlled device, and may receive a feedback signal from the device to the host to report to the fire alarm system linkage important part of the input and output modules on the market can provide a pair of passive normally open / normally power supply module plc‍ contacts for controlling the controlled device, some manufacturers of modules through parameter setting, set to active output (eg Bay GST-LD-8301), there are also double the corresponding input and output modules, the input and output modules, and so more.