JPS6323433A - Supervisory equipment - Google Patents

Abstract

PURPOSE:To transmit the state of supervised point correctly by judging whether a selection signal is normal or not, outputting the supervised signal as a fetched supervisory signal only when it is normal and outputting an abnormal signal when not normal. CONSTITUTION:An input selection circuit 4 uses a selection switching command signal CS to bring a selection signal S1 to logical '1' and to bring other selection signals S2-Sn to logical '0', they are outputted and a gate G of a multiplex switching circuit 1 corresponding to the selection signal S1 is turned on to output supervised signals I11-I1n to an input switching circuit 2. Then an input control circuit 3 outputs a switching signal CI to input the selection signals S1-Sm via the input switching circuit 2, thereby confiming only the selection signal S1 to be logical '1' and other selection signals S2-Sm to be logical '0', it is judged that the operation of the input selection circuit 4 is normal, the switching signal CI is switched to fetch the supervised signals I11-S1n from the input switching circuit 2. The fetched supervised signals I11-S1n are subject to processing such as parallel/serial conversion and the result is outputted as a supervisory signal Vs. On the other hand, when it is judged not normal, the fetch of the supervised signal of the group is stopped and an abnormal signal is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a monitoring device, and more particularly to a monitoring device that monitors the status of a large number of monitored points provided in a wireless device of an unmanned wireless station.

[Conventional technology]

Conventionally, this type of monitoring device is as shown in FIG. !
The monitored signals I11 to 1 of the monitored points provided in the monitored device 10, such as a line device, are first transferred to the multiplex switching circuit 1.
Then, the selection signals 81 to Sm are used to switch and output each group divided into n groups. This output signal engineer 1~In
are input to the input control circuit 3a, and each of these output signals 1
1 to In are subjected to processing such as parallel/serial conversion, and the monitoring signal V'
Output as s.

Further, the input control circuit 3a outputs a selection switching instruction signal C8, and the selection switching instruction signal C8 causes the input selection circuit 4 to output selection signals SI to Sn+.

[Problem that the invention seeks to solve]

As mentioned above, the conventional monitoring device is configured such that only the output signals 1 to In of the multiplexing switching circuit 1 selected by the selection signals S1 to Sm are input to the input control circuit 3a. 4, a failure etc. occurs and the selection signals S, ~Sm
If this is not output, the state of the monitored point will not be correctly input to the input control circuit 3a, resulting in a disadvantage that the state of the monitored point cannot be correctly monitored.

Further, at this time, it is impossible to detect a failure in the input selection circuit 4, and there is a drawback that the reliability of determining whether the state of the monitored point is good or bad is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a monitoring device that can detect failures in input selection circuits and can accurately communicate the status of monitored points.

[Means for solving problems]

The monitoring device of the present invention includes a multiplexing switching circuit that switches and outputs a plurality of monitored signals for each group divided into a predetermined number by a selection signal, and an output signal of this multiplexing switching circuit and the selected an input circuit for switching between signals, an input circuit that outputs the switching signal and a selection switching instruction signal, and inputting an output signal of the input switching circuit so that the selection signal is a normal signal in accordance with the instruction of the selection switching instruction signal. converting the output signal of the multiplexing switching circuit from the input switching circuit into a monitoring signal and outputting it when the input switching circuit is normal;
It has an input control circuit that outputs an abnormal signal when an abnormality occurs, and an input selection circuit that outputs the selection signal in response to the selection switching instruction signal.

〔Example〕

Next, an actual tJ@ example of the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

The multiplexing switching circuit 1 is provided in the monitored device 10.
Monitored signals from multiple monitored points■1□~Imn
are divided into m groups of n groups, and selection signals Sl to Sm
Accordingly, each group is sequentially switched and output via each gate G.

The input switching circuit 2 receives the output signals of the multiplexing switching circuit 1, that is, the selected signal to be monitored, ~In, and the selection signal SI~Sm.
are input, and these monitored signals 11 are input by switching signal CI.
-In and selection signals 81-Sm are switched and output.

The input control circuit 3 receives a switching signal CI and a selection switching instruction signal C.
According to the instruction of this selection switching instruction signal C8, it is determined by inputting the output signal of the input switching circuit 2 whether the selection signals 81 to S11 are correctly transmitted to each group, and if it is normal, the input switching is performed. Monitored signal from circuit 2■, ~
In is subjected to processing such as parallel/serial conversion and outputted as a monitoring signal Vs, and if it is abnormal, an abnormal signal is output without taking in the monitored signals 11 to In.

The input selection circuit 4 outputs selection signals 81 to S for selecting a predetermined group from the grouped monitored signals Ill to I+in according to the selection switching instruction signal C8.
Outputs 11.

Next, the operation of this embodiment will be explained.

For example, when selecting the monitored signals ■1□ to Inn, the input selection circuit 4 sets the selection signal Sl to "1" and the other selection signals S2 to Ss to "0" according to the selection switching instruction signal C8.
The gate G of the multiplexing switching circuit 1 corresponding to the selection signal S1 is turned on, and the monitored signals III to Inn are output to the input switching circuit 2.

Next, the input control circuit 3 outputs the switching signal CI, and inputs the selection signals 81 to Sm through the input switching circuit 2. Only the selection signal S1 is "1", and the selection signals 82 to SI are "0". ”
It is determined that the operation of the input selection circuit 4 is normal, and the switching signal CI is switched to the monitored signal Iz~
Inn is taken in from the input switching circuit 2.

Similarly, when selecting monitored signals Im4 to Imn,
The selection signals S1 to Sm with only the selection signal Sm set to "1" may be output, and the input control circuit 3 may monitor the states of the selection signals SI to Sm.

Monitored signals III to Inn taken into the input control circuit 3
etc., processing such as parallel/serial conversion is performed and the monitoring signal V5
is output as

On the other hand, if it is determined that there is an abnormality, the acquisition of the monitored signal of that group is stopped and an abnormal signal is output. If this abnormality signal is also incorporated into the monitoring signal ■s, it is possible to monitor not only the status of each monitored point but also the operation of the input selection circuit 4, etc., by simply monitoring the monitoring signal ■s.

〔Effect of the invention〕

As explained above, the present invention switches between a selection signal for selecting a monitored signal for each group and a monitored signal of a selected group by an input switching circuit and inputs it to an input control circuit, and checks whether the selection signal is normal or not. By determining the status of the monitored point and outputting the monitored signal as a monitoring signal only when it is normal, and outputting an abnormal signal when it is abnormal, the status of the monitored point can be correctly transmitted, and the input This has the effect of being able to detect failures in the control circuit.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a conventional monitoring device. DESCRIPTION OF SYMBOLS 1-- Multiplexing switching circuit, 2... Input switching circuit, 3゜3a... Input control circuit, 4-- Input selection circuit, 10
...-Monitored device, G-...Gate. 7. Agent in PA Patent attorney Uchihara d-↓ Man1 old story 2I ¥1

Claims (1)

[Claims] A multiplexing switching circuit that uses a selection signal to switch and output a plurality of monitored signals for each group divided into a predetermined number; and an input switching circuit that uses a switching signal to switch between the output signal of this multiplexing switching circuit and the selection signal. outputting the switching signal and the selection switching instruction signal, inputting the output signal of the input switching circuit and determining whether the selection signal is a normal signal according to the instruction of the selection switching instruction signal; an input control circuit that converts the output signal of the multiplexing switching circuit from the input switching circuit into a monitoring signal when it is normal and outputs an abnormal signal when it is abnormal; A monitoring device comprising: an input selection circuit that outputs an output.