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  2. Dual loop - Wikipedia

    en.wikipedia.org/wiki/Dual_loop

    Dual-loop is a method of electrical circuit termination used in electronic security applications, particularly modern intruder alarms. It is called 'dual-loop' because two circuits (alarm and anti-tamper) are combined into one using resistors. Its use became widespread in the early 21st century, replacing the basic closed-circuit system, mainly ...

  3. Fire alarm control panel - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_control_panel

    A fire alarm control panel (FACP), fire alarm control unit (FACU), fire indicator panel (FIP), or simply fire alarm panel is the controlling component of a fire alarm system. The panel receives information from devices designed to detect and report fires, monitors their operational integrity, and provides for automatic control of equipment, and ...

  4. Standards for Alarm Systems, Installation, and Monitoring

    en.wikipedia.org/wiki/Standards_for_Alarm...

    The alarm transmission methods covered under UL 365 can be categorized under standard line security or encrypted line security. The systems are required to operate within the limits of Class 2 remote control and signal circuits as defined by the National Electrical Code, NFPA 70. [15]

  5. Passive infrared sensor - Wikipedia

    en.wikipedia.org/wiki/Passive_infrared_sensor

    When used as part of a security system, the electronics in the PIR typically control a small relay. This relay completes the circuit across a pair of electrical contacts connected to a detection input zone of the burglar alarm control panel. The system is usually designed such that if no motion is being detected, the relay contact is closed—a ...

  6. Security alarm - Wikipedia

    en.wikipedia.org/wiki/Security_alarm

    In the event of an alarm, the premises control unit contacts a central monitoring station. Operators at the station take appropriate action, such as contacting property owners, notifying the police, or dispatching private security forces. Such alerts transmit via dedicated alarm circuits, telephone lines, or the internet.

  7. Electronic control unit - Wikipedia

    en.wikipedia.org/wiki/Electronic_control_unit

    An electronic control unit (ECU), also known as an electronic control module (ECM), is an embedded system in automotive electronics that controls one or more of the electrical systems or subsystems in a car or other motor vehicle.

  8. Programmable logic controller - Wikipedia

    en.wikipedia.org/wiki/Programmable_logic_controller

    A programmable logic controller (PLC) or programmable controller is an industrial computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, machines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis.

  9. Supervisory circuit - Wikipedia

    en.wikipedia.org/wiki/Supervisory_circuit

    A thermal protection circuit consists of a temperature-monitoring circuit and a control circuit. The control circuit may either shut down the circuitry it is protecting, reduce the power available in order to avoid overheating, or notify the system (software or user). These circuits may be quite complex, programmable and software-run, or simple ...

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