JPH0637729A - Remote supervisory system - Google Patents

Abstract

PURPOSE:To allow a subordinate station equipment to supervise a fault information as to transmission block differently from usual alarm information in the system where a host station equipment supervises alarm information from the subordinate station equipment. CONSTITUTION:A subordinate station equipment 20 is provided with a 2M highway interface block 21 that detects an alarm of a message transmission block 22 itself, changes a bit of a time slot and sends the resulting slot to a host station equipment 10, and the host station equipment 10 is provided with a 2M interface block 12 that extracts a time slot of a subordinate station from a 2M ground line, with a shift register circuit 13 outputting a bit for alarm report of the message transmission block 22 from the time slot and with a message reception block 11 recognizing respectively output information from the shift register circuit and usual alarm information from a subordinate station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring system, and more particularly to a remote monitoring system improved in a system for monitoring alarm detection of a message transmission block of a lower station device of a communication line by a higher station.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, this type of remote monitoring system has a message transmission block 22 of a lower station device 20.
The alarm in the device detected at 2M Highway
A message signal is sent to the upper station apparatus 10 in one time slot determined by the interface block 21. In the upper station device 10, the 2M highway interface block 12 extracts the message signal from the same time slot and sends it to the message receiving block 11. Next, the message receiving block 11 analyzes the message signal to detect an alarm in the lower station device.

[0003]

In this conventional remote monitoring method, when an abnormality occurs in the message transmission block of the lower station apparatus, it becomes impossible to transmit a message to the upper station apparatus. However, there is a defect that the abnormality of the message transmission block of the lower station apparatus and the alarm of the lower station apparatus cannot be detected.

[0004]

According to the remote monitoring system of the present invention, a higher station apparatus is connected by a terrestrial circuit transmitting a digital signal having a plurality of time slots for remotely monitoring alarm information of a lower station apparatus. In the remote monitoring system, the lower station device sends alarm information in the first time slot and allocates a bit in another second time slot for alarm detection in order to send the alarm of the message transmission block. Means for sending to the device, means for outputting the ALM detection bit from the first time slot in the upper station apparatus, and means for detecting an alarm of the message transmission block of the lower station apparatus based on the information of the second bit Is equipped with.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a signal format for explaining the operation of this embodiment. Figure 1
In the upper station apparatus 10, the digital signal from the lower station apparatus 20 is received by the 2M highway interface block 12, separated for each time slot, and output to the message reception block 11 and the register circuit 13. The output of the shift register circuit 13 is input to the protection circuit 14, and the output of the protection circuit 14 is monitored by the message reception block 11. An alarm monitoring line for monitoring an alarm of each block in the lower station device is connected to the message transmission block 22 which monitors the alarm in the lower station device, and the 2M interface block 2
1 is connected to a message transmission line and a message transmission block alarm monitoring line 23 which is an output of an alarm signal of the message transmission block 22 itself. As shown in FIG. 2, which is the signal format of the terrestrial line between the upper station apparatus 10 and the lower station apparatus 20, the first bit of time slot 0 is assigned for alarm detection of the message transmission block 22.

Next, the operation of this embodiment will be described. In FIG. 1, when the message transmission block 22 of the lower station device 20 detects an alarm in the device, the 2M interface block 21 sends an alarm report message to a determined time slot, for example, time slot 1
In step 6, it is transmitted to the higher station apparatus 10. In the higher station device 10,
2M highway interface block 12 extracts time slot 16 and message receive block 1
Send to 1. In the message reception block 11, an alarm in the device other than the message transmission block 22 can be known from the transmitted message. When an abnormality occurs in the message transmission block 22, the message transmission block alarm monitoring line 23 becomes "0". This is detected by the 2M interface block 21, and the bit of the time slot different from that of the message is used. For example, the second bit of the time slot 0 is set to "0" and sent. On the contrary, if the message transmission block 22 is normal,
The second bit is always "0". Upper station device 10
Then, the time slot 0 is constantly extracted by the 2M highway interface block 12 and sent to the shift register circuit 13. The shift register circuit 13 outputs the second bit of the time slot, and the output when the message transmission block 22 is abnormal is "1". This output is input to the protection circuit 14 and outputs "1" to the message receiving block 11 when "1" is detected consecutively N times.
This is a circuit for preventing chattering. From the output of the protection circuit 14, the message reception block 11 of the upper station device 10 can detect the alarm of the message transmission block 22 of the lower station device 20.

[0007]

As described above, according to the present invention, when the upper station apparatus remotely monitors the message transmission block of the lower station apparatus, a bit of a certain time slot is allocated and transmitted for alarm detection. By monitoring the bit, the upper station apparatus has an effect that the abnormality of the message transmission block itself of the lower station apparatus, which could not be known until now, can be accurately detected by the upper station apparatus. Here, the 2M terrestrial line has been described as an example, but other terrestrial lines, such as 1.5M, have the same effect.

[Brief description of drawings]

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

FIG. 2 is a signal format of this embodiment.

FIG. 3 is a block diagram of a conventional example.

[Explanation of symbols]

10 Upper Station Device 11 Message Reception Block 12, 21 2M Highway Interface Block 13 Shift Register Circuit 14 Protection Circuit 20 Lower Station Device 22 Message Transmission Block 23 Message Transmission Block Alarm Monitoring Line 24 Alarm Monitoring Line

Claims (2)

[Claims] 1. In a remote monitoring method, in which a higher station apparatus is connected by a terrestrial line transmitting a digital signal having a plurality of time slots for remotely monitoring alarm information of a lower station apparatus, the lower station apparatus transmits a message. In order to send an alarm of a block, means for sending alarm information in the first time slot and allocating a bit in another second time slot for alarm detection, and sending it to the upper station apparatus, and in the upper station apparatus, A remote monitoring system comprising means for outputting an ALM detection bit from the first time slot, and means for detecting an alarm of a message transmission block of the lower station apparatus based on the information of the second bit. . 2. The upper station apparatus transmits the message transmission block information of the lower station apparatus transmitted by the information of the second bit to the message reception block for detecting normal alarm information and transmits the message of the lower station apparatus. The remote monitoring system according to claim 1, wherein an abnormality of the system itself is recognized.