METHOD AND APPARATUS FOR STABILIZING OUTPUT OF PROGRAMMABLE LOGIC CONTROLLER IN POWER TRANSITION AND MALFUNCTION OF CPU

METHOD AND APPARATUS FOR STABILIZING OUTPUT OF PROGRAMMABLE LOGIC CONTROLLER IN POWER TRANSITION AND MALFUNCTION OF CPU

PURPOSE: A method and a device for stabilizing the output of a PLC(Programmable Logic Controller) in the power transition and malfunction of PLC are provided to secure stabilization and soundness of a nuclear safe system by supplying a fail safe function of a digital/analog output by operating a PLC...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: NO, YOUNG HUN, LEE, YOUN SANG, KIM, JUNG HUN, YOO, KWAN WOO
Format: Patent
Sprache:eng ; kor
Schlagworte:
NUCLEAR ENGINEERING
NUCLEAR PHYSICS
NUCLEAR REACTORS
PHYSICS
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Beschreibung
Zusammenfassung:PURPOSE: A method and a device for stabilizing the output of a PLC(Programmable Logic Controller) in the power transition and malfunction of PLC are provided to secure stabilization and soundness of a nuclear safe system by supplying a fail safe function of a digital/analog output by operating a PLC according to the definition after defining the status of the PLC. CONSTITUTION: A hot swap device(200) increases the power output of a PLC according to the power increase of the PLC if a circuit board is mounted on a safe class PLC. A hardware reset unit(210) generates a hardware reset if the power output of the hot swap device is increased according to the power increase of the PLC. A CPU initializing unit(220) initializes a CPU and resets software. A power fail sensor senses the off of the safe class PLC. A power fail processor(240) inactivates the digital/analog output of the safe class PLC and stores final data operated by the CPU of the safe class PLC in a preset memory. The power fail processor turns off the hardware of the PLC after stopping the operation of the PLC.