What is the fire in a single-input \ single output modules?

This plc module is used for a variety of live action and a motion signal output passive devices such as: exhaust valves, send valve, dampers and other access to the control bus.
This module uses electronic encoder to encode in the small plc has a pair of normally open, normally closed contacts. Module has a 24V DC voltage output for the relay contacts connected to the active output to meet the different needs of the scene. Another module also has a switching signal input for the switch contacts and the field devices connected to the field devices to confirm whether the operation. It should be noted that the module should not be directly connected to AC control loop contact, to prevent damage to the module strong AC interference signal or control equipment.