SU824211A1 - Device for testing indication elements - Google Patents

Description

The invention relates to automatic KB and computing and can be used in information boards, control panels of digital computers, in devices with digital readout. A similar device is known comprising a control unit, indicator elements, a non-operable detection unit, and a control indicator element l. However, in the known device, it is not possible to determine promptly which particular indicator element is faulty. And, moreover, in case of malfunction of the malfunction detection unit or the control indicator element, the operator will not be timely notified of reading false information, which reduces the reliability of the display. Closest to the proposed technical entity is a device for monitoring indicator elements, comprising a pulse generator, a control unit, the outputs of which are connected to the inputs of indicator elements and the corresponding inputs of the fault detection unit, and the first input is the device input, and the control indicator element 2 . A disadvantage of the known device is that in the known device the information is read by the operator on the basis of the absence of the control indicator element, since it is assumed that this means the health of all the display elements. But the burning of the control indicator element will be absent even if the control circuit itself malfunctions (the pulse generator, the malfunction detection unit, the control indicator element), has a certain probability of failure. In this case, the known device does not actually perform the task of timely notifying the Operator of reading false information. All this significantly reduces the display readability, leads to the possibility of errors, which can remain undetected for a long time and the cost of which can be quite large. The purpose of the invention is to expand the scope of the device 3M

increasing the range of fixed faults.

The target is achieved by the fact that the device contains a trigger, the setup input of which is connected to the output of the pulse generator, the reset input to the output of the fault detection unit, and the output connected to the control indicator input, and a delay element whose input is connected to the output of the pulse generator, and the output is connected to the second input of the control unit.

The drawing shows a block diagram of a device for monitoring indicator elements.

The device contains a control unit 1, indicator elements 2, a control indicator element 3, a unit

4 fault detection, 5 pulse generator, delayed element b, trigger 7.

The device works as follows.

The pulse generator 5 generates short polling pulses with a duration t and a large period of time T. The polling pulse arrives at the first input of the trigger, drives it into the On state, and at the input of the delayed element b. From the output of the delayed element b, the polling pulse delayed by time t ;, goes to the inputs of the control units 1, closing them. All indicator elements 2 are turned off. When the indicator elements 2 are healthy, the signals from the outputs of the control blocks 1 are fed to the inputs of the fault detection block 4. The signals coincide in time with each other, the duration of which is equal to the pulse duration at the inputs of the control blocks 1. In the presence of signals, from each of the control units 1 at the output of the fault detection unit 4, a signal is generated that arrives at the second input of the trigger 7 / returns it to the state. Disabled. Thus, the trigger 7 is in the On state during the delay time t of the polling pulse of the delayed element b. During this time, the control indicator element 3 is lit. Since the interrogation pulses arrive with a period T, the control indicator element 3 does not light up on the same period. t ,,, inform the operator about the health of the indicator elements 2 and the control circuit itself {control indicator element 3, trigger 7, fault detection unit 4, generator

5 pulses, element 6 delay).

If at least one indicator element 2 malfunctions, the control indicator element does not periodically light up, since no signal is received from the output of the corresponding control unit 1, therefore, the fault detection unit 4 does not generate a signal to return the trigger 7 to the Disable state. The control indicator element 3 is lit continuously, the signal / 1 of the error of the information displayed on the indicator elements 2. .

In case of failure of the cxeNM Conrol itself, the flashing of the control indicator element 3 is also absent. The control indicator element -3. Either lights continuously or does not light at all (depending on the nature of the fault). Both of these states of the control indicator element are signaling unreliability of the information displayed on the indicator elements 2.

If it is necessary to specify a fault, a control signal is supplied to the control unit 1. In this case, in block 1 of the control, independently of 6 tons of information signals coming from sources of information, all indicator elements 2 are turned on. Non-burning indicator element 2 is faulty. In the absence of non-firing indicator elements 2, the control circuit itself is faulty.

The duration of the polling pulses t generated by the generator of 5 pulses is recommended to choose as short as possible units of microseconds n less, based on the speed of the device elements. The polling pulse tracking period T should be taken for as long as possible in the order of one or several seconds. The delay time t-is selected from the calculation of the possibility of the control indicator element 3 being lit at the selected time.

Thus, in the device, the health of the control circuit and indicator elements 2 during operation of the device is constantly monitored by the periodic flashing of the control indicator element 3, the information read by the operator from the indicator elements 2 has high accuracy. -. .

The economic effect is determined by the cost of error when the operator reads false information from the display elements, the probability of which is significantly reduced when using the device.

Claims (2)

Invention Formula The control device of the indicator elements, containing a pulse generator, a control unit, the outputs of which are connected to the inputs of the indicator elements and the corresponding the inputs of the fault detection unit, and the first input is the device input, and the control indicator element, characterized in that, in order to expand the field of application of the device by increasing the range of fixed faults, it contains a trigger, the installation input of which is connected to the output of the pulse generator, the input reset to the output of the fault detection unit, and the output is connected to the control input indicator element, and the delay element, the input of which is connected to the output of the pulse generator, and the output is connected to the second input of the control unit. e Sources of information taken into account in the examination . 1. USSR author's certificate  432483, cl. General F 3/14, 1972. l 2. USSR author's testimony  545996, cl. General K 15/18, 1975 (prototype). O-L-HE