JPS60154171A - Fault detection system - Google Patents

Abstract

PURPOSE:To always monitor a fault by displaying the AND output between the input of a unit monitor signal from a controller to each electronic circuit unit and the output of an in-unit normal operation monitoring circuit, and connecting fault detecting circuits successively in series through a buffer and connecting the final stage to the controller again in feedback form. CONSTITUTION:When an electronic circuit EC1 is in normal operation, the input signal A and the output signal B of the in-unit normal operation monitoring circuit 30 are ANDed by an AND circuit 40 to generates the AND circuit C; the normal operation state is displayed on a display device 50 and a normal operation signal is also inputted from a terminal OUT through the buffer 60. The next stage unit U2 receives it to perform the same operation with the unit U1 when the operation in the unit is normal, and transmits a signal to its next stage unit U3. If a fault occurs in the unit U3, the output B is not generated, so there is no output from the AND circuit 40 and the display device 50 does not turn on, so it is found that the unit U3 faults. Consequently, the faulty unit is detected easily.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a plurality of electronic circuit units l'1. This invention relates to a low-cost failure detection method that can constantly monitor the operating status of each unit in a system configured with 1 (1) and quickly detect the presence or absence of paper and select a faulty unit.

(Prior Art) Conventionally, as a method for detecting a faulty unit in this type of system, each unit 1, 2, . , , , , 11 is a dedicated signal line (11, (2), -0 (nl) for indicating normal operation of the control device cL
and (7) I had one in between. Therefore, if the number of units in the system increases, the number of signal lines will increase accordingly, and the task of monitoring the presence or absence of signals and detecting failures will also increase as the number of detection points I. Since the number of signal lines is large, it is a task that requires patience and rigor.Furthermore, the faulty unit can be selected using a display installed on the control device side, but as the number of signal lines increases, this means of display is also expensive. Become something. Furthermore, in order to detect at a low cost, there is a method of visual inspection using a display device such as a light-emitting quiato' or a lamp for each unit, but it is not always appropriate as it is necessary to check all units and there is a risk of oversight. It is hard to say that it is a suitable method.

(Invention σ month) In view of these circumstances, the purpose of the present invention is to connect the IN and OU of the UNISO J/monitoring signal line regardless of the number of UNIT/I units.
Only two ``i'' are used, and the failed unit I and subsequent ones are OU'.
J” Since all the indicators put out by the faith go out, the late l!+
, j units can be easily detected in a system consisting of multiple units I/1.

(Structure of the Invention) In order to achieve the objective of -1-1, the present invention provides a display for each electronic circuit unit to display the unit monitoring signal human power from the control device and the ant output of the unit's normal operation monitoring circuit. A failure detection circuit is provided which displays the information and outputs it to the next stage via a buffer, and the failure detection circuits are connected in series one after another, and the last stage is again explained to the control device.

(Embodiment) FIG. 2 is a block diagram showing an embodiment of the present invention, in which the fee I/hack signals between each unit of the electronic circuit unit group 10 including the failure detection circuit are shown by lines Jl1, etc. Control device 2
It is connected in a loop to the unit monitoring signal output terminal of 0. FIG. 3 shows, for example, a first
This is a schematic explanatory diagram of the failure detection circuits A and CC1, and the other electronic circuit units U2 to Un also have failure detection circuits with a similar structure. In the figure, IN is a signal input terminal, and 0IJT is a signal output terminal r- 30 is an electronic circuit (a normal operation monitoring circuit in the JL unit, 40 is an ant circuit, 50 is a normal operation indicator such as a light emitting diode, a lamp, etc.), and the electronic circuit 1'
((: When 1 is in normal operation, the input signal A and the output signal I3 from the unit normal operation monitoring circuit 30 operate the ant circuit 40 to output the AND output C, and the display 50 indicates that the normal operation is in progress. While displaying in Hatsufa 60
A constant-motion A'1 signal is output from the OUT terminal via the OUT terminal. The next stage unit [, I2 receives this and if the operation within the unit is normal, riI] performs the same operation as the unit IJ1 described above, and transmits the trust to the next stage unit U3.

However, if a failure occurs in this unit 5, there will be no output 13 from the unit's normal operation monitoring circuit 30, so there will be no output from the AND circuit 40, and the display 50 will not light up. Then, the unit U5 has a malfunction.
It turns out that there is. In addition, after the failed unit, the OU
Since the l' signal is no longer output, all the indicators are turned off, and since the unit j monitoring signal does not flow to the unit 11 and unit 7sj 20, at ib'ji; t1 + unit 7sj 20, the unit 11 It is detected that there is a late l(f,'I) in any of the unit 1, and by looking at the display 50 of each unino I, it is possible to determine which unit is the late l(+',9). It can be detected at the age of 1.

(Effects of Light) As explained below, the present invention is not concerned with the number of units.The loop-shaped unit monitoring bond has each unit connected in line with a line, and the acid 1 After the grass unit, 0111" debt will no longer appear, so all the indicators of the units after that will disappear, and the effect is that the acid 1t, +5 unit will only detect rrt1.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the conventional system, FIG. 2 is a block diagram showing the system of the present invention, and FIG. 3 is a circuit diagram showing the failure detection circuit of unit 1-. 10-1 Electric circuit unit I・No 1-'(, L, l 1~
Shib+---Name unit, A CC-m-Failure detection circuit, Li~i, n-1~--Inter-unit foot hack signal line, 20-m-Control device, 30----Inside unit 1
1: Normal operation monitoring circuit, 40---An I circuit, 50
----, i, IE'riζ operation indicator, 60 ----
Buffer, 1=]C---1 electronic circuit. Patent applicant: Tohoku Oki Electric Co., Ltd. I” Honmeyer Co., Ltd.

Claims (1)

[Claims] In a system consisting of a large number of electronic circuit units, 11-normal operation +ri displays the AND output of the human input signal and the normal operation monitoring circuit output within the unit on the normal operation indicator.
At the same time, each electric circuit unit is provided with a failure detection circuit that outputs the normal operation f'1 Goku through a buffer and does not output it in the event of a failure, and these 1(riX detection circuits are connected in sequential columns, The unit monitoring signal of the control device installed in the IS is connected to the output terminal, and the unit monitoring signal is transmitted to the loop signal line formed by this, and the normal operation indicator indicates each unit. ) A failure detection power formula characterized by detecting 1 friction because of ~.