Addressable panels are usually much more advanced than their conventional counterparts, with a higher degree of programming flexibility and single point detection.
TSIGNALING LINE CIRCUIT LOOPS
Panels usually have a number of signaling line circuit loops – usually referred to as loops or SLC loops – ranging between one and thirty. Depending on the protocol used, a loop can monitor and control several hundred devices. Some protocols permit any mix of detectors and input/output modules, while other protocols have 50% of channel capacity restricted to detectors/sensors and 1/2 restricted to input/output modules. Each SLC polls the devices connected, which can number from a few devices to several hundred, depending on the manufacturer. Large systems may have multiple SLCs, and SLCs are further divided into sub-groups through the use of fault-isolation modules.
Each device on a SLC has its own address, and so the panel knows the state of each individual device connected to it. Common addressable input (initiating) devices include:
- Smoke detectors
- Manual call points or manual pull stations
- Notification appliances (Simplex systems with TrueAlert signals only)
- Fire sprinkler system inputs
- Flow control
- Isolate Standard switches
- Addressable output devices are known as relays and include
- (Warning System/Bell) Relays
- Door Holder Relays
- Auxiliary (Control Function) Relays
- Relays are used to control a variety of functions such as Switching fans on or off
- Activating fire suppression systems
- Activating notification appliances
- Shutting down industrial equipment
- Recalling elevators to a safe exit floor
- Activating another fire alarm panel or communicator.