Operation and command failure monitor

Details Operation and command failure monitor Operation and command failure monitor

1977-10-11

1979-09-04

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular system function

340517, G08B 1900

Patent

active

041670035

ABSTRACT:
A device for monitoring equipment failures within a process plant. The device determines the following condition of a two-state contact (1) Normal; (2) Off-normal due to an abnormal condition; and (3) Off-normal due to a normal condition and functions to alert a plant operator or automatically initiate a corrective action whenever a device, piece of equipment or an electrical motor has abnormally stopped or failed to complete a commanded operation without being operator initiated or initiated by some other normal function.
In the preferred embodiment the device comprises an alarm module of the type having a memory circuit connected to a logic circuit which is connected in parallel to at least two alarm circuits. The alarm circuits comprise a flasher circuit and a time delay circuit with a third output of the device comprising a driver circuit. The flasher circuit is designed to transmit a pulsating output signal alternating between a high and a low state. The time delay circuit is designed to transmit a time delayed steady output signal. The driver circuit is designed to transmit a steady output signal which is a repeat or complement of one of the input signals.

REFERENCES:
patent: 3665399 (1972-05-01), Zehr et al.
patent: 3949356 (1976-04-01), Fuzzell et al.

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