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ZigBee Application – Emergency Alarm System

PACTECH / ICP DAS (EN17W35_07, by YY Chang)

An emergency alarm system is often used in the MRT, buildings, schools, or hospitals, as well as other public places where security management is required. If an accident occurs, you can press the alarm to immediately notify the relevant personnel. At the same time, the security control center will be informed of the location of the event and send staff to take immediate action. However, implementing this concept has difficulties that many people are seeking solutions to deal with.


Using a traditional system in campus security management as an example, an alarm is installed in a restroom entrance, and is only linked to a buzzer. However, if an emergency is encountered, the staff at the security center are not immediately and efficiently notified as the emergency message is not transmitted to the security center.
To transmit messages, you will need to pay more for the wiring from multiple locations to the security center. If these locations are far away from the security center or if they are spread across different buildings, the costs are often quite high.

Based on the application described above, ICP DAS provides a ZigBee wireless solution that can be installed to solve the difficulties and problems related to wiring development, as well as reducing the cost.

The ZT-IOG System is Perfect for Emergency Bell Systems

The ZT-IOG system can automatically update the status of the DIO channel and notify the message center (ZigBee Coordinator) via wireless communication. The message center will then synchronize the status of all DO channels in the ZT-IOG network. This synchronization of the change in DO state may function as an “emergency alert” to trigger an alarm.

ZigBee Network Alarm Bell System

Description of the Application Architecture

An emergency alarm may be installed in many places, and every alarm should be able to actively notify the security center of an event. The architecture of a ZigBee network of ZT-IOG modules is a multi-to-multi I/O Pair-connection, so the message center will be notified of an event triggered from any alarm.

The architecture of the ZT-IOG network is also a multi-to-multi I/O Pair-connection, so it will link the mapping of the DO channels for all ZT-IOG modules in the network if any alarm is triggered. By applying “Pulse Mode” control logic, you can install the alarms in many locations and link the warning devices for these locations. For example, link the alarms or video devices in multiple locations to multiple security control centers.

ZigBee Network Alarm Bell System Architecture

Event Triggering Modes

When implementing ZT-IOG modules in different applications, you can install different triggering devices depending on the event mode of the application.

(1) “Edge Mode” can be applied to a “Momentary Button” in a lighting control system, so that multiple lights can be simultaneously turned on or off.

Momentary Button

(2) “Level Mode” can be applied to a “Push Button” in a fire safety alarm system, so that the emergency alarm can be triggered and released in the same location.

Push Button

(3) The “Emergency Button” locks on when pressed, and require a key to reset it. This attribute ensures that it cannot be restored easily. Therefore, it can be used as an alarm trigger if an emergency occurs, and you will not be concerned that the alarm has been intentionally disabled.

Emergency Button

Related Products


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ICP DAS was established in 1993 and strongly focuses on innovation and the enhancement of industrial automation technology. ICP DAS continuously endeavors to develop a comprehensive selection of products ranging from remote I/O controllers, distributed I/O modules, I/O data acquisition boards, programmable automation controllers, industrial communication modules, web-related products, motion control systems, SCADA/HMI software to automation solutions for applications critical to energy management, motion automation, smart factories, intelligent buildings, and smart cities. Our ambition is to provide a wide range of high-quality products and versatile applications, together with prompt and efficient services, that can be implemented to assist in the continued success of our clients worldwide.

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