FIELD: security systems.
SUBSTANCE: invention relates to managing security systems or to process control systems (I&C systems). Control unit comprises a threshold unit consisting of an input digital pulse counter, a clock generator, a timer digital pulse counter, a threshold RS-trigger, configured to generate a control signal when the value of the input frequency signal of the threshold frequency is exceeded, wherein the control signal is intended to transmit it to actuating or processing equipment, and the control unit of the operating mode of the actuator or the process equipment comprises a node for determining the device malfunctions that converts the physical parameter acting on it into a frequency signal.
EFFECT: technical result of the claimed invention is to increase the reliability of the threshold control unit and the safety of the controlled process object.
6 cl, 2 dwg
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