How to control the switch of normally open steel fire door?

Normally open fire door is a normally closed movable fire door with a normally open fire door release device. The normally open controller outputs DC24V working voltage to the electromagnetic door stopper release device of the fire door, so that electromagnetic door stopper can attract the door leaf of the fire door to locate and keep the door in a normally open state. In case of fire, the controller is often turned on after receiving the fire linkage signal or smoke detector signal, so that the electromagnetic door stopper is cut off and the door body is released. The left and right doors of the controller are powered off respectively (the delay is about 6 seconds), and the left and right doors of the fire door are closed in turn under the action of the fire door closer. At the same time, the controller feeds back the release action signal, and if it is necessary to feed back the fire door closing signal, the door collision switch is added. Function: The fire door is always open, which is convenient for people to pass, ventilate and light, and can be automatically closed in case of fire, thus playing the role of smoke prevention and fire prevention. Therefore, the inconvenience caused by the normal closing of the fire door to the passage of people and the man-made damage caused by the frequent opening and closing of the fire door are completely solved, and the fire safety is ensured at the same time.