What is the difference between the return line of the fire control module and the normal opening of the controlled device?
Often open, also known as: dynamic combination; often closed, also known as: dynamic broken, is for buttons, electromagnetic relays, electromagnetic contactor and other electronic devices.Normally open, understood as "usually disconnected," or "broken under normal conditions"";Normally closed is understood as "usually closed," or "normally closed."";
They are normally open, and there are few normally closed points. Because most of the module answers are often open answer.
Normally open, that is, under normal conditions, for the channel. When the fire alarm is abnormal, the switch is switched off, and can be used as a cut-off trigger switch of the power supply system;Normally closed, that is, in normal condition, is a circuit breaker. When the fire alarm is abnormal, the switch is turned on, and can be used as the trigger switch of an alarm system or an opening signal of a fire fighting system.
The electromagnetic relay is connected and disconnected, which is the state of the contact, and when the coil is energized, the relay is pulled in: the normally open contact is connected, and the normally closed contact is disconnected. 2, the output device such as a relay, the normally open contact of the relay, but the device is energized, the relay pull in, the normally open contact is connected with the output; it is normally closed contact of the relay, but the device after power relay is broken.
