JPS62181536A - Transmission state supervisory equipment for communication line - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a fault in advance by outputting a fault signal and informing the fault while it is taken as the fault or a state causing easily the fault when a rate of a voltage level outside of the setting range is a set value or over such as the decrease in a voltage level. CONSTITUTION:A rectangular transmission signal A is fetched in a supervisory equipment 4 via a line insulation section 5, a voltage level is compared with a set voltage at comparison sections 11, and when the voltage exceeds the set voltage, an H level output is outputted. A logic circuit section 12 outputs the H level output when the voltage is within the set range based on the comparison output from the section 11. A pulse is generated in response to the H level output and the number of pulses is measured to count the time when the voltage level is within each setting range. The rate of the time with respect to the unit time of the voltage level in a range causing a fault easily is obtained among the measured times and at the time of the time rate exceeds the set rate, a fault signal is outputted to activate a fault notice means 8.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a monitoring device that monitors whether or not an abnormality has occurred in a communication line between a main device and a communication device.

(Prior art and its problems) In conventional devices of this type, communication is actually carried out between the main device and the communication device, and it is checked whether data is accurately transmitted from the main device to the communication device using sampling. I was checking.

However, in the case of a conventional example with such a configuration, if data is being transmitted, it is determined to be normal, and if it is not, it is determined to be abnormal. had the disadvantage that it was not possible to detect the abnormality.

Also, since it only looks at the transmission results, whether normal or abnormal, even if the data transmission is normal,
However, in the past, there was a drawback that it was not possible to prevent the occurrence of an abnormality because it was not possible to know such a situation.

(Object of the Invention) The present invention has been made in view of the above circumstances, and does not aim to continuously monitor the transmission status and prevent abnormalities from occurring. (Structure and Effects) In order to achieve the above object, the present invention provides a voltage level measuring means for continuously measuring the voltage level of a transmission signal in a communication line, and a voltage level measuring means for measuring the voltage level measured by the voltage level measuring means. Based on the above, an abnormality detection means detects a proportion of voltage levels outside a set range within a unit time and outputs an abnormal signal when the proportion exceeds a set value, and detects an abnormality in the transmission status in response to the abnormal signal. and an abnormality notification means for notifying.

According to this configuration, when the ratio of voltage levels outside the set range is higher than the set value, such as when the voltage level drops, an abnormal signal is output as an abnormal state or a state where an abnormality is likely to occur, and an abnormal signal is output. The notification means can notify abnormalities and prompt maintenance and inspection.

Therefore, data transmission status can be constantly monitored, abnormalities can be detected well, and even when data transmission is being performed normally, it is possible to know when an abnormality is likely to occur. Because it can be done, based on that,
It is now possible to appropriately repair defective parts that may cause abnormalities in advance, prevent abnormalities from occurring, and improve the quality and reliability of communication systems when they are configured.

(Description of Examples) Hereinafter, the present invention will be described in detail based on examples shown in the drawings. FIG. 1 is a block diagram showing the configuration of a transmission status monitoring device according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a communication system. In these figures, l is the main device, 2 is a communication device, and 3 is a two-wire communication line connected from the main device 1 to the communication device 2. It is designed to communicate.

Reference numeral 4 denotes a monitoring device, which is connected to the communication line 3 via a line insulator 5 in an electrically insulated state.

As shown in FIG. 1, the monitoring device 4 is equipped with a voltage level measuring means 6, an abnormality detecting means 7, and an abnormality-3=notifying means 8.

The voltage level measuring means 6 includes a voltage level comparing section If, which is composed of a comparing section 9 and a voltage level setting section 10, respectively.
. . . and the voltage level comparison section 11 . . . A logic circuit section I2 that outputs an output at the "I" level when the voltage level is within the set range is provided, according to the output from each of the voltage level comparison sections 11. The voltage level of the transmission signal on line 3 is continuously measured.

The abnormality detection means 7 includes a counter section I3 and a timekeeping section 14.
and an arithmetic unit 15.

The counter section I3 is equipped with a pulse generating section 16 and a gate section 17 that receives pulses from the pulse generating section 16, and has seven "
In response to the H" level output, the gate section 17 is opened and a pulse output is produced.

The timer section 14 is equipped with a timer section I8 and a gate section I9 that receives a time signal from the timer section 18, and opens the gate section 19 in response to the pulse output from the counter section (3). , it is designed to output time output.

Based on the time output from the clock section 14, the calculation section 15 has the following functions:
a first detection unit 20 that determines a voltage level outside a set range as an abnormality within a unit time and detects the abnormality ratio;
A first setting section 21 that sets a predetermined ratio, and a first detection section 2
A first comparing section 22 is provided which compares the abnormality ratio detected at 0 and the ratio set by the first setting section 2I, and outputs a first abnormality signal when the abnormality ratio is equal to or higher than the setting. ing.

The calculation unit 15 also includes a second controller that detects the contention rate within a unit time, that is, the collision of transmissions between the plurality of communication devices 2, 2, based on the time output from the timer I4. a detection unit 23 and a second setting unit 2 that sets a predetermined ratio
4, and a second comparison unit 25 that compares the abnormality ratio detected by the second detection unit 23 and the ratio set by the second setting unit 24, and when the contention ratio is equal to the setting part "2". A second abnormality signal is outputted.

The abnormality notification means 8 includes a first abnormality notification means 26 that responds to the first abnormality signal by lighting or flashing a lamp, or uses a buzzer to notify an abnormality in the ratio of the voltage level, and a first abnormality notification means 26 that responds to the second abnormality signal. In response, a second abnormality notification means 27 is provided which similarly reports an abnormality in the contention ratio by lighting or blinking a lamp, or by using a buzzer.

Next, the operation of this embodiment will be explained using the time chart shown in FIG.

A rectangular transmission signal A is taken into the monitoring device 4 via the line insulator 5, and is compared with a set voltage (for example, aV, bV, where aV<bv) in the voltage level comparator 11. (aV or more) and -aV
The comparison output less than -bv is defined as B1, and the comparison output greater than -bv and without a groove is defined as B. ) outputs an “H” level output.

Based on the comparison output from this voltage level comparison section II, the logic circuit section 12 determines that the logic output when the voltage level is greater than or equal to aV and less than bv, and less than -87 and greater than or equal to -bv is defined as C0. At some point, it outputs a "T-1" level output.

In this way, logical outputs are output for each setting range set in multiple stages. A pulse is generated in response to the "H" level output, and the number of pulses is measured. Of these measurement times, the ratio of 4 times per unit time of the voltage level in the range where an abnormality is likely to occur is calculated, and when this time ratio exceeds the set ratio, an abnormality signal is generated. is output to activate the abnormality notification means 8 to notify that the abnormality is in an abnormal state or in a state where an abnormality is likely to occur.

The contention is whether rectangular waves from multiple communication devices 2.2 are superimposed or cancel each other out, and the signal voltage level when contention is not occurring is c(V).
), then it becomes 2 c (V ) or 0 (■), and the percentage of voltage levels exceeding the setting range (for example, more than bv) and the percentage of voltage levels below (for example, -bv less than g)
It is determined that the voltage levels are the same and are distinguished from the abnormality of the voltage level.

In the above embodiment, the monitoring device 4 is provided separately from the communication device 2, but it may be incorporated within the communication device 2.

The present invention includes a second detection unit 2 for detecting the contention ratio and notifying when the contention ratio is higher than a setting.
3. The second setting section 24, the second comparison section 25, and the second abnormality notification means 27 may not be provided.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a transmission status monitoring device according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a communication system, and FIG. 3 is a time chart. 3... Communication line, 6 Voltage level measuring means, 7...
Abnormality detection means, 8... Abnormality notification means.

Claims (1)

[Claims] (1) A voltage level measuring means that continuously measures the voltage level of a transmission signal in a communication line, and detecting a voltage level outside a set range within a unit time based on the voltage level measured by the voltage level measuring means. A transmission status of a communication line, comprising an abnormality detecting means for detecting a ratio and outputting an abnormal signal when the ratio is greater than a setting, and an abnormality reporting means for notifying an abnormality in the transmission status in response to the abnormal signal. Monitoring equipment.