Can fire detectors be connected directly to the station control PLC?

In accordance with current fire protection codes, the signals from standard heat and smoke fire detectors cannot be directly connected to a PLC as a replacement for the fire alarm controller. The reasons are as follows: 1. According to the **Standard \"Design Code for Automatic Fire Alarm Systems\" (GB50116), it is clearly stipulated that smoke and heat detectors should be connected to dedicated fire alarm control devices and must undergo **mandatory certification (CCC certification). Ordinary PLCs are not specialized control devices for fire protection, nor have they undergone fire safety certification; therefore, they cannot be used directly as signal input devices for detectors. 2. Regarding whether it is possible to avoid classifying them as fire detectors, it should be noted that if what is actually installed and used are proper heat and smoke detectors that meet fire detection requirements and have obtained the CCC fire safety certification, even if you claim subjectively that they are \"only for ordinary testing,\" fire inspection authorities will generally still consider them to be part of the fire alarm system; therefore, they must be installed in accordance with fire safety standards. 3. In current practice, for purposes such as temperature and smoke detection in ordinary industrial processes (using non-professional fire detectors intended solely for industrial environment monitoring and process interlock), industrial-grade sensors that are not certified for fire protection systems can be employed. However, such devices can only be used for industrial processes; they cannot be labeled as fire detection devices for smoke or heat, and they are not suitable for use in fire safety inspections or the verification of fire protection functions. The key to determining whether it belongs to a fire alarm system is: whether it is used for fire protection purposes and whether it falls within the scope of building fire protection inspections. - Is the selected sensor a product with fire protection CCC certification? ； - If it has obvious fire detection and alarm functions, it should be considered part of the fire protection system, and must be designed in strict accordance with fire protection system standards, along with a fire alarm controller. Therefore, the approach proposed in your project will find it difficult to pass fire safety inspections and fails to meet regulatory requirements. It is recommended to follow the standard requirements by installing a dedicated fire alarm controller, which will then provide the alarm output signals to the station control PLC. .

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