Abstract: A plurality of fire, smoke, security or other detectors of the type which respond to the existence of a predetermined condition are each connected to an input circuit. Each input circuit is connected to one indicator circuit and when a detector is triggered, the input circuit associated with that detector generates a signal which in turn actuates and latches on the corresponding indicator circuit. The indicator circuit remains latched on even after the detector returns to an untriggered condition and the input circuit signal is removed. A first release circuit is provided to release all indicator circuits which have been latched on. When a predetermined number of detectors simultaneously respond to their respective predetermined conditions, an alarm signal generates an input to by-pass the first release circuit, thus precluding the first release circuit from releasing the plurality of indicator circuits.

Abstract: A shut-down and first-out annunciator device comprising sensor switches that change condition when a fault occurs. Logic and display circuits provide a digital readout indicative of a fault condition. Shut-down means are responsive to a shut-down signal produced by the logic circuit and produce a latching signal for the display. A first power supply powers all sections during normal operation and a second power supply powers the display and shut-down circuits after shut-down.

Abstract: A system condition indicator for monitoring a number of interlock switches and fuel valves to detect what event first occurs to shut down a burner control system. The monitoring circuitry is periodically strobed once each cycle of the power line signal and is only responsive to an abnormal interlock switch or fuel valve during the strobe time. The present invention does not respond to an abnormal condition for a predetermined time after burner operation is initiated, to allow the system parameters to go to their operational values. The present invention includes circuitry for monitoring the pilot fuel flow and the main fuel flow and for providing an indication if either flow is abnormally terminated to shut down the furnace system. When the furnace system is shut down in response to an abnormal condition, an indication is provided of the first interlock switch or fuel valve to open, allowing a determination to be made of what caused the furnace failure, either during start-up or during normal operation.

Abstract: A shut-down and first-out annunciator device comprising sensor switches that change condition when a fault occurs. Logic and display circuits provide a digital readout indicative of a fault condition. Shut-down means are responsive to a shut-down signal produced by the logic circuit and produce a latching signal for the display. A first power supply powers all sections during normal operation and a second power supply powers the display and shut-down circuits after shut-down.

Abstract: A warning system for a printing press to warn the operator upon the exceeding, or departure from, a desired set of running conditions which includes a plurality of remote condition transducers which, in the simplest form of the invention, are in the form of switches. Coupled to the transducers are respective signal generators each of which generates an acoustic signal which has a distinctive quality as compared to all of the other acoustic signals. A loudspeaker common to all of the signal generators is audible at the control station. The distinctiveness of the signal serves to promptly inform the operator which of the running conditions has been exceeded so that corrective action may be taken. In a second embodiment of the invention the transducers produce output control signals which vary in magnitude with the condition, and the corresponding acoustic signal generator produces a signal having a distinctive first quality when the control signal exceeds a threshold level.

Abstract: A conditions monitor circuit for repetitively displaying the condition of a plurality of sensors which recognize different conditions includes a plurality of gates that are divided into groups which specify conditions for their respective sensors. The gates in each group are connected to a particular sensor and there is a clock for sequentially enabling each group of gates. The enabling clock pulse for each group of gates is also connected to a driver circuit to indicate which sensor is being interrogated. The gates in each group are connected to all of the conditions indicating driver circuits through diodes. There are display means connected to the driver circuits for indicating both the particular sensor being scanned and the condition of that sensor.

Abstract: A plurality of sensors are provided each sensing a different condition occurring in a motor vehicle. Each sensor supplies a signal to a converter which converts the signals into a four-digit binary coded signal. A plurality of condition indicating panels, each bearing up to four projections, sequentially move past a stationary switch arrangement to open at least one of four normally closed switches to produce further binary coded signals. A digital comparator compares the four-digit binary signal from the converter with those developed by the switches. The comparator produces an output to drive an electric motor to continue movement of the indication panels when the compared signals do not coincide. When coincidence occurs, the output from the comparator changes to stop the motor thereby displaying the selected indication panel.

Abstract: The present invention is a display device with a memory which stores the order of reception of actuating signals from a plurality of terminal units. When one of the terminal units produces a signal a first counter causes the outputs of all the terminal units to be scanned. Each terminal unit is connected to a resettable one shot circuit which is scanned under the control of the first counter. When the signaling terminal unit is scanned, the resettable one shot is triggered to advance the count of a second counter. Then the number in the first counter, which corresponds to the specific signaling terminal unit, is stored in one of a plurality of memory means which corresponds to the order of reception stored in the second counter. The resettable one shot circuits prevent the number of a specific terminal unit from being stored in a second memory means due to a continued or repeated signal.

Abstract: A series of signals are derived from respective transducers, fault detection switches, cubicle door interlock switches and the like at appropriate places in an industrial plant or apparatus. The signals are taken to a system which monitors them for the presence of a fault indicating signal or other signal of interest. The system has a series of scanner devices which are controlled by a logic circuit so as to scan the signals one after the other in a repetitive sequence. Since the transducers, switches and such may be linked one with another so that, when one is producing a fault signal, others later in the sequence may also produce such a signal, the logic system operates so that when a fault signal is located, a further scanning sequence is gone through so that there is located the first transducer or switch in the sequence which is producing a fault signal. This transducer or switch is then identified by a numeric or alpha-numeric display device.