JPH01204539A - Alarm signal supervising circuit - Google Patents

Abstract

PURPOSE:To suppress the increase in number of photocouplers and interface points by providing a circuit using a multiplexer at the side of individual communication equipment in place of a diode array circuit. CONSTITUTION:Address signals A0-A2 outputted from a CPU 7 are sent through an interface section 9 and an individual communication side employs an interface section 9' and photocouplers 11-1-11-3 to receive the signals. The signals are used for integrated circuits 10-1-10-8 for multiplexer are control signals to select the output. Then an input side alarm signal outputted sequentially from the multiplexer is selected by using a prescribed address signal. Thus, the alarm signal supervising circuit is constituted by the less number of photocouplers and interface points to improve the mount efficiency of components or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control circuit using a microcomputer, and particularly to alarm monitoring of various communication equipment used in a satellite communication earth station.

[Conventional technology]

Conventional alarm monitoring will be explained with reference to FIGS. 3 and 4.

FIG. 3 shows the alarm signal receiving section, and FIG. 4 shows the alarm signal sending section of the individual communication equipment.

In the operation of communications equipment used in satellite communications earth stations, it is necessary to monitor, if necessary, hundreds of signals for the purpose of monitoring two separate alarm signals. For this reason, conventionally, these alarm signals have been processed by using a diode array as shown in FIG. 3 and a scanning method as described below. The above-mentioned alarm signal is transmitted by the transmitting section shown in Fig. 4.Individual alarm signal lines shown in Figure 4 are 3- 1-3-6
It is connected to an alarm signal sending section consisting of a relay contact built into a communication device as shown in 4. Here, if a failure occurs in the function of the communication equipment monitored by the relay contact 3-1 of the alarm signal sending section shown in Fig. 4, an earth signal is sent to the signal line AlO2 in the interface section 1-1'. be done.

As mentioned at the beginning, Figures 3 and 4 respectively show the alarm signal capture section and the individual communication device output section.2Normally, these are connected by a cable using a photocoupler. .

As mentioned above, when an earth signal is applied to the signal line AlO2 due to the occurrence of a fault, a drive current flows through the photocoupler 6-1 in FIG. It changes to a state where it can be turned on by a DC bias applied to it.

On the other hand, address signal A is input to the decoder integrated circuit 2 in FIG. Depending on the state of T AB T A2, the outputs O6 to 07 of this decoder integrated circuit 2 are as shown in Table 1 below.
As shown in the truth table shown in FIG. A forward bias is applied between the emitter and collector of the photocoupler connected to one column of the diode array 4 because the collector is pulled up by a collective resistance. Therefore, when the output 0° of the decoder integrated circuit 2 in FIG. 3 is at the "L" level.

``Ll level is given to the input A1 of 5. Then,
A control signal "C0NT" which controls the output of this buffer integrated circuit 5 is used to connect the output to the pass line D.

An "L" signal is output, and this signal is input to the CPU, etc., and an alarm is displayed.

Margin table below 1 The above applies to all photocouplers 6-
The same can be said about 1 to 6-64. for example.

When the output 0° of the decoder integrated circuit 2 in FIG. 3 is "LI level", information on a total of eight alarm signals connected to the photocouplers 6-1 to 6-8 can be sent to the CPU 7 at the same time. Output O8-0 of this decoder integrated circuit 2
If you scan 7 by changing the "L" level sequentially, a total of 64
It is possible to send a different alarm signal to the CPU 7 using 8-bit parallel data by scanning it 8 times.

[Problem to be solved by the invention]

In the conventional circuit described above, alarm signals are monitored by applying a forward bias between the collector emitters of the NPN transistors in the photocoupler for each column of the diode array 4 shown in FIG. 3, and scanning the bias. There is. However, as mentioned above, the interface section 1-
The number of contacts to be connected between 11 to 1-8 and the interface parts 1-1' to 1-8' shown in FIG. 2 pieces are required. For this reason, in the case of the water-conductor circuit shown in Fig. 3.

64x2 (number of photocouplers x 2) = 128 interface points are required. As mentioned at the beginning,
If there are hundreds of alarm signals to be monitored, the number of interface points required is considerable. For this reason, it becomes difficult to mount components in communication devices that take miniaturization into consideration.In view of the above-mentioned drawbacks, the technical problem of the present invention is to improve photocouplers and interface points as the number of monitoring and alarm signals increases. An object of the present invention is to provide an alarm signal monitoring circuit capable of suppressing an increase in

[Means to solve the problem]

The present invention incorporates a multiplexer integrated circuit into nine individual communication devices in an alarm signal monitoring circuit for communication devices using a microcomputer.

means for controlling the selection of alarm signals of communication equipment connected to the input of the multiplexer integrated circuit;

The present invention is characterized in that it performs alarm monitoring by including means for outputting information on the status of communication equipment outputted from the multiplexer integrated circuit to a path line using a photocoupler.

In other words, in order to suppress the increase in the number of interface points due to the increase in the number of monitoring and alarm signals, the present invention replaces the diode array circuit with a circuit using a multiplexer on the side of one individual communication device. The number of interface points used is suppressed to the lowest level and the number of interface points is reduced.

〔Example〕

FIGS. 1 and 2 are block diagrams of an embodiment of the present invention. FIG. 1 shows an alarm signal receiving section, and FIG. 2 shows an alarm signal sending section of an individual communication device. , 3 and 4 are given the same numbers.

In this circuit, as shown in FIG. 1, an address signal A is output from the CPU 7. r A1 m A2 are sent out through the interface unit 9, and on the individual communication equipment side in FIG.
Receive using 3. These signals are used as control signals for selecting outputs in multiplexer integrated circuits 10-1 to 10-8 shown in FIG. Table 2 shows the truth table.

Table 2 From the truth table in Table 2, address signal A. , A1°A2 are all at "L" level,! :, A signal line Q is connected to each output of the multiplexer integrated circuits 10-1 to 10-8 in FIG. Information on the alarm signal connected to is output. For this reason.

A201 in FIG. A202. ..., A2
The information on the eight alarm signals numbered 08 is sent to the photocouplers 6-1 to 6-8 in FIG. 1, and a drive current flows for those whose signal level is L'' among them.

The hot coupler turns on. As a result, the path line D of the buffer integrated circuit 5 of FIG. A "L" level signal is sent to the path line connected to the signal line in which the hot coupler is in the on state among D7, and an "H" level signal is sent to the other path lines. These 8-bit signals are on pass line D. - The information is input to the CPU 8 from D7, and an alarm is displayed.

Similarly, the address signal in Table 2 is A. ：”H Rubel e
In the case of AI + A, @"Ll level, alarm signals connected to the signal lines Q are outputted to the outputs of the multiplexer integrated circuits 10-1 to 10-8, respectively. In this way, one embodiment of the present invention Taking the circuit configuration.

By sequentially selecting the alarm signals on the input side output from the multiplexer using the address signals in Table 2, a total of 64 alarm signals can be transmitted to the photocouplers 11-1 to 11-3 in Fig. 2, as in the conventional circuit. Monitoring can be performed using a total of 11 photocouplers, including 3 photocouplers and 8 photocouplers 6-1 to 6-8 shown in FIG. That is, as in the present invention, the output of the multiplexer is used as the address signal A. r A1 + A
Sequential selection in step 2 has the same meaning as scanning a diode array and capturing alarm signals in the conventional circuit.

As explained above, when conventional circuits are used, 2 For example, in order to monitor 64 alarm signals, 64 photocouplers are required in one-to-one correspondence, and the number of interface points is twice as many. 128 diodes were required, but with the circuit configuration of the present embodiment, two anodes and two cathodes each of the diodes of the photocouplers 11-1 to 11-3 used for sending out address signals shown in FIG. Interface points and interface part 1 in Figure 2
With only a total of n interface points A101 to A116 within ', it is possible to monitor the same number of alarm signals as in the conventional circuit.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, an alarm signal monitoring circuit can be configured with significantly fewer photocouplers and interface points than in the past, and the mounting efficiency of nine components can be greatly improved. can.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the alarm signal capture section of the present invention, and FIG. 2 shows an embodiment of the alarm signal transmission section of the present invention. FIG. 3 shows an example of a conventional alarm signal acquisition section, and the fourth
The figure shows an example of a conventional alarm signal sending section. 1, 1-1.1-1', 9.9': Interface section. 2, 2-1.2-8: Collective resistance, 3-1 to 3-64:
Alarm signal sending unit, 4: diode array, 5: buffer integrated circuit, 6-1 to 6-64.11-1 to 1l-3=
Hotokagura, 7: CPU, 8: Collective resistance, 10-1 to 1
0-8: Integrated circuit for multiplexer.

Claims (1)

[Claims] 1. In a communication device alarm signal monitoring circuit using a microcomputer, a multiplexer integrated circuit is incorporated in the individual communication device side, and means for controlling the selection of alarm signals of the communication device connected to the input of the multiplexer integrated circuit. and means for outputting status information of a communication device output from the multiplexer integrated circuit to a bus line using a photocoupler.