SU1191887A1 - Device for checking indication elements - Google Patents

Abstract

A DEVICE FOR CONTROL OF INDICATION ELEMENTS, containing a pulse generator, a first delay element connected to the inputs of control units of monitored display elements, and an input to a setup input to a single trigger state, the output of which is connected to the first control display element, and zero trigger state - output of the fault detection block connected by inputs to the first inputs of the device, the second inputs of which are connected to the outputs of the corresponding control block No controlled display elements, characterized in that, in order to expand the functionality of the device by determining the numbers of the faulty monitored display elements, the first AND element, the second delay element, the first OR element and the number of second inputs of the device are entered into the device, and the block fault detection contains the second element And, the start node, the switch, the second element OR, the counter and the second control display elements connected to the outputs of the counter and the control inputs of the switch connected by the information inputs to the inputs of the malfunction detection unit and the inputs of the second element And connected by the output to the output of the error detection unit, the gate input of the switch is connected to the output of the first delay element, and the output of the switch is connected to the first input of the second element OR, connected by the second input to the output of the startup node W, and the output to the counting input of the counter, the limiting resistors are connected to the second inputs of the device, the generator output and The pulses are connected to the first input of the first OR element connected by the second input to the output of the first AND element, the first input of which is connected to the trigger output, and the second input to the output of the second delay element connected by the input from the output of the first delay element connected by input 00 00 to the the output of the first element OR.

Description

The invention relates to automation and computing and can be used in information boards, control panels of electronic computers, devices with digital readout.

The purpose of the invention is to expand the functionality of the device by determining the numbers of faulty monitored display elements.

FIG. 1 shows a diagram of the device; in fig. 2 and 3 are time diagrams illustrating his work.

The device contains a pulse generator 1, the first and second elements OR 2 and 3, the first delay element 4, the second delay element 5, the first and third elements AND 6 and 7, the control blocks 8 of the monitored display elements that can be performed on the elements OR 9, And 10 and NOT 11, trigger 12, monitored display elements 13, limiting resistors 14, first control display element 15, fault detection unit 16 consisting of a switch 17 made, for example, on elements AND 18 and element OR 19, start node 20 including trigger 21, buttons in “O and“ 1 and differentiating chain 22, counter 23, decoder 24, second control elements 25 of the display and second element I 26.

The device works as follows.

The pulse generator 1 generates short polling pulses with a duration of tr with a large period of following T (Fig. 2 and 3). The polling pulse arrives through the first OR element 2 at the input of the delay element 4 and the first input of the trigger 12, putting it into a single state. From the output of the delay element 4, the polling pulse delayed by time tj is fed to the inputs of the control units 8. Due to this, the AND 10 element is closed, and a single signal from the output of the delay element 4, having passed through the OR 9 elements of all the control blocks 8, appears at their outputs. In this case, all elements 13 should light up for the duration of the pulse. In this case, a voltage drop is created on the resistors 14, which is perceived by the fault detection unit 16 (second element AND 26 and switch 17) as a single signal. With the health of the elements 13 on all inputs of the block 16 fault detection - code "1. At the same time, a single signal is also generated at the output of block 16, which sets trigger 12 to the zero state. Timing diagrams illustrating the operation of the device when all the monitored elements 13 are in good condition are shown in FIG. 2. Thus, trigger 12 is in a single

state during the delay time tjj of the polling pulse by the delay element 4. During this time, the first control element 15 of the display is lit. Since the polling pulses arrive with a period T, the control element 15 lights up for the same time period t, informing the operator about the operability of the monitored elements 13 and the control circuit itself (first control element 15, trigger 12, fault detection block 16, pulse 1 generator ow, the first element 4 delay). The operation of the switch 17, the elements of AND 7 and OR 3, the node 20 launch, the counter 23, the decoder 24 and the second control elements 25 thus does not affect the operation of the device.

In case of failure (burnout) of at least one of the monitored elements 13, the periodic ignition of the first control indicator element is absent, since the signal through the monitored is output from the corresponding control unit 8. element (for example, due to a filament break) and the corresponding resistor does not pass. This level is perceived by the fault detection unit 16 as the code "O. Fault block 16 does not generate a signal to return trigger 12 to a zero state. The first control element 15 is lit continuously, signaling from the unreliability of information displayed on the monitored elements 13. At the same time, using a counter 23, a decoder 24 and a switch 17, a signal from one of elements 13 is sent to the input of element 7 (each state of counter 23 and therefore , each output of the decoder 24 is assigned to one of the elements 13). If it is “1, then it enters through the element OR 3, and the contents of counter 23 are incremented by one. The delay element and the element 6 cause the generation of the next pulse at the output of the first delay element 4 through the time tjj + tji from the time of the beginning of the previous one (Fig. 3). This allows the indication of the failed indication element to be detected. Each pulse from the output of the first delay element 4 is supplied to the control units 8. Due to this, the contents of counter 23 are changed for each pulse, if the code "1" arrives at the input of element 7 from the output of switch 17 (i.e. if the corresponding element 13 is operational). As soon as the counter is in the state corresponding to the failed element 13, the code "O" appears at the output of the switch 17. Element AND 7 is closed and the state of counter 23 does not change. Using the control elements 25, you can determine which number of controlled element 13 failed. To

to determine all failed monitored elements 13 (if several of them fail at the same time) the launch node 20 is used. By successively pressing the buttons "O and" 1 of the trigger 21, a single pulse is generated at the output of the differentiating circuit 22, which increases the counter state by one. Under the action of pulses from the output of the delay element 4, the counter changes its state until the next failed element is connected to the input of the element 7. Determining the number of the failed element 13 is especially important in the case when the elements are significantly separated from one another.

When the control circuit itself malfunctions, the first control element 15 is also not flashing, the first control element 15 either lights continuously or does not light up at all (depending on the nature of the fault). Both of these states of the first control element 15 are signaling unreliability of the information displayed on the elements 13.

The duration of the polling pulses tj., Generated by the generator 1 pulses,

It is recommended to choose as short as possible (on the order of units of microseconds or less) based on the speed of the device elements, the polling pulse period T is longer (on the order of one or several seconds). The delay time should be selected on the basis of the possibility of the control element 15 to light up during this time.

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Claims (1)

DEVICE FOR MONITORING INDICATOR ELEMENTS, comprising a pulse generator, a first delay element connected by an output to the inputs of the control units of the monitored display elements, and an input to the input to the unit in the single state of the trigger, the output of which is connected to the first control indication element, and to the unit input to zero trigger state - the output of the fault detection unit, connected by inputs to the first inputs of the device, the second inputs of which are connected to the outputs of the corresponding control unit to controlled display elements, characterized in that, in order to expand the functionality of the device by determining the numbers of faulty controlled display elements, the first AND element, the second delay element, the first OR element, and limiting resistors by the number of second inputs of the device are introduced into the device, and the detection unit The malfunction contains a second AND element, a start-up unit, a switch, a second OR element, a counter and second control indication elements connected to the outputs of the counter and control to them the inputs of the switch connected by information inputs to the inputs of the fault detection unit and the inputs of the second AND element, connected by the output to the output of the fault detection unit, the gate input of the switch is connected to the output of the first "delay element, and the output of the switch is connected to the first input of the second OR element, § dintered by the second input with the output of the “start” node, and the output with the counter input of the counter, the limiting resistors are connected to the second inputs of the device, the output of the pulse generator is it is connected to the first input of the first OR element connected to the output of the first AND element by the second input, the first input of which is connected to the trigger output, and the second input to the output of the second delay element connected by the input to the output of the first delay element connected by the input to the output of the first OR element .