JPS62295535A - Transfmission control system - Google Patents

Abstract

PURPOSE:To attain the transmission control system rich in the maintenability and expanding performance of the system while improving the line efficiency by providing a means confirming the rationality of its own station address and a sent data and a supervisory section having a means initializing the inside of its own station as required, stopping the data transmission and reporting the fault detection to a master station into a slave station. CONSTITUTION:The supervisory section 7 uses an address rationality discriminating means 8 to confirm the operation of a transmission start section when a destination address of a call signal from a master station is coincident with it of its own station and to confirm the inoperation when dissident thereby discriminating the rationality of the processing to a destination address. Thus, the erroneous transmission is detected in advance. A sending data rationality discrimination means 9 supervises the sending data before transmission to detect the sending of a fault data in advance. An initializing discrimination means 10 initializes a slave station to suppress the increase in the processing load by the master station and to minimize the data transmission quantity due to the sending of transmission stop release command if a slave station is faulty. A transmission discrimination means 11 controls the switch 6 to inhibit the data transmission forcibly in response to the result of discrimination of the means 8, 9, 10 and uses the means 12 to report the occurrence of the slave station falut to the master station instead.

Description

[Detailed description of the invention] 3. Detailed description of the invention [Industrial application field] The present invention relates to a transmission control method for a data transmission system.

Particularly suitable for controlling abnormal orders in slave stations.

This paper relates to a transmission control method. 21
1 [Prior Art] Conventionally, in this type of data transmission system, the master station is the main station.

The slave station sends a call @ signal with the address of the slave station to be called to the slave station, and the slave station constantly monitors the destination address of all the call signals flowing on the line and calls the slave station address as its own slave station. The destination address of the signal.

When a match is detected, data is sent to the master station.

The method is to send out the following information.

There are obstacles in such data transmission systems.

Abnormal transmission by the slave station where this occurred and this abnormal transmission 11.
(1) Prolonged system down time (In cases where slave stations are scattered in remote areas, maintenance personnel visit each station in turn to discover failures and problems.) i in Japanese Patent Application Laid-Open No. 127452/1983 as a means for solving various problems such as

Count the number of transmissions within the specified time period as stated.

Counting circuit and timer for counting and also for sending.

Added a holding control section to forcibly stop the force.

By doing so, a certain number of times or more within a predetermined period of time.

A layer that considers the above transmissions to be abnormal and stops the transmission from the master station.

Forcibly stops transmission until a deletion command is received.

The method is known.

[Problem that the invention seeks to solve]

However, in this conventional system, no consideration has been given to countermeasures against failures that occur simultaneously in a plurality of slave stations, and measures against system expandability in which the number of connected slave stations changes. That is, the above-mentioned conventional technology takes into consideration the simultaneous occurrence of failures in multiple slave stations and system expandability.

There were problems as shown below. 1O(
1) Abnormal data will be sent on the line from the time the faulty slave station starts abnormal transmission until it is forcibly stopped. This may be the case when the master station has to receive important system operation data from other slave stations and multiply it by 15 times, even if it is only for a short time. When failures occur continuously in the slave station.

In this case, the line efficiency will decrease.

Therefore, the time period during which the line is occupied by abnormal transmission is:

It needs to be further shortened. 2゜(2
If a failure occurs in the recognition unit of a slave station, it is possible that the station will not be able to recognize the destination address in the paging signal and will start abnormal transmission, resulting in a transmission stop message.

A transmission stop sent from the master station to restore the status.

Transmission suspension for a specific slave station is canceled because it is not possible to recognize which slave station the suspension cancellation command is directed to.

Multiple defective slave stations respond to the command and restart transmission, which makes it difficult to localize the cause and location of the fault.゛(3)
Considering the expandability of the system, the number of slave stations connected to the master station via the transmission line is not fixed (preferably variable 1f+). However, in the conventional system, when the number of slave stations is made variable. In this case, a normal transmission may be regarded as an abnormal transmission.In other words, the number of slave stations changes and the number of slave stations temporarily changes.
If only the slave station is to be connected to the master station, all ringing signals sent from the master station will normally be connected to the only one.

This is a signal addressed to the slave station, and the slave station responds to this signal.

It is a normal process to send data from to.

However, the timer and counting circuit are fixed.

211. Continuous transmission beyond the threshold transmission circuit.
3. The feed is forced to stop. this.

Therefore, the system must be operated every time the number of connected slave stations changes.

interrupt and change the settings of the timer and counting circuit.

Moreover, the system has poor expandability. (The question is whether the abnormality that occurred in the slave station 41 is caused by a failure in the hardware 5 of the slave station or not on the transmission line.

Temporary data abnormalities (data errors due to noise).

It is difficult to determine whether the abnormality is caused by
Receives transmission stop cancellation command from normal pressure master station.

Otherwise, it will be impossible to restart the operation, leading to an increase in the IO processing load on the master station and a decrease in line efficiency. - An object of the present invention is to provide a transmission control method for a data transmission system that solves the above problems and has improved line efficiency, system maintainability, and system expandability.
15 [Means for resolving the problem] A function to confirm that the bureau is being implemented.

7. The data sent by the slave station is transmitted by the master station, other slave stations, and the transmission amount. .

Make sure that the data does not cause any abnormality in the line.

The function to confirm that the nuclear station has fallen into a failure state.

In this case, send a transmission stop cancellation command from the pressure master station.

data on the processing load tank and transmission line of the master station.

A function for initializing the slave station 5 in order to suppress the amount of transmission to the necessary minimum, and a result of the above-mentioned functional operation.

Data and nuclear pulses that the slave station is trying to transmit.

If it is detected that the operation is abnormal, data transmission is forcibly prohibited and an abnormality occurs in the slave station instead.

This can be achieved by providing a monitoring section with a function of reporting to the master station.

[Effect]

Among the above-mentioned problems, item 11 is caused by the operation of the counting unit and timer allowing the transmission of abnormal data within a certain period of time, and this is caused by the monitoring unit installed in the +1i slave station. address rationality determination function.

Therefore, the destination address of the received paging signal corresponds to the destination address.

When the address matches the slave station address, the transmission activation section operates.

Make sure that the call signal is received in reverse.

When the destination address does not match the nuclear slave station address, a.

Make sure that the transmitter is not working.

Since it becomes possible to determine the rationality of processing for the destination address of the paging signal, abnormal transmission can be detected in advance.

In addition, by monitoring the data that the transmitting unit is about to transmit using the transmission data 5 rationality determination function of the monitoring unit installed in the slave station, it is possible to detect abnormal or abnormal data transmission in advance. . - This functions effectively when the type and range of transmission data is determined in advance according to the purpose of the system.

By adding these functions, abnormal data.

This eliminates the above-mentioned problem (1).

Among the above problems, item (2) was provided within the slave station.

The address rationality determination function doubles the determination operation for the destination 1° address of the paging signal.

Re-address recognition errors are avoided and eliminated. .

Problem number 5 (item 51 is the abnormal operation determination method).

Rather than counting the number of transmissions within a certain period of time, the child.

Each control of the station will be constantly monitored by the monitoring unit. .

This increases the number of slave stations connected to the master station.

Even if changes occur, system operation will be interrupted and reconfiguration checks will be performed.

This problem can be solved by making the work unnecessary.　　.

Among the problems mentioned above, item (4) was provided within the monitoring section.

The initialization determination function allows the nucleons to initialize themselves and recover from failures such as data errors.

If it can be done and it cannot be recovered by initialization, do the following.

It can be identified as an air problem and will be resolved.

〔Example〕

Hereinafter, an embodiment of the present invention will be explained with reference to FIG. 2 identifies whether or not the destination address of the paging signal is addressed to the slave station, and after predetermined processing in the processing unit 3, operates the transmission activation unit 15 to send out the master station busy data. The transmission starting unit 4 causes the transmission.

The communication section 5 is activated and predetermined data is sent via the transmission line.

and send it to the master station.

Among these series of processes, reception is performed in reception s1.

The destination address of the paging signal is monitored by the monitoring unit 7, and it is determined that the destination address is 1°.7. even though the paging signal is addressed to the slave station.

If the transmission activation unit does not operate, disconnect the transmission switch 6 (connected to the output side of the monitoring unit) and initialize the slave station.

become However, each time this initialization is performed, the number of times is stored in the monitoring unit 7, so that the number of times that data errors may occur on one transmission line is determined.

Allows initialization up to a number. During this time, it was the parent station.

It is also assumed that the initialization of the nucleons is reported. And if the number of initializations exceeds a predetermined value.

11′ between nucleons, rather than a failure due to data errors.
It determines that it is a hardware failure and reports it to the master station.

As a result of the transmission data rationality determination, if the monitoring unit 7 detects that the slave station is about to transmit abnormal data, it similarly performs initialization processing and reports to the master station. . Child station processing and monitoring unit processing in this embodiment.

An outline of the operation is shown in Figure 2.

According to this embodiment, the monitoring section is a microprocessor.

The number of parts can be realized with software.

The reliability of the system can be improved by reducing the
・ ８ ・ It is possible to improve the monitoring of each part of the slave station.

By adding a software function, it is possible to send information to the master station about whether a failure has occurred in the slave station, improving maintainability.

It has the effect of being able to

〔Effect of the invention〕

According to the present invention, there are the following effects.゛(1
) The abnormality report from the monitoring unit makes it possible to isolate the problem even when multiple slave stations are experiencing simultaneous failures.

The maintainability of the system is improved. II+
(2) In the case of a failure due to a data error on the transmission line, it can be recovered by initializing the monitoring unit, and there is no need to send a command for recovery from the master station, improving line efficiency. This will improve the economic efficiency of the system.

(3) System expandability is improved because the number of slave stations connected to the master station can be made variable. .

(The status of each part of the 41 slave station is monitored by the monitoring unit, and any abnormalities are detected.

This caused problems with continuous system use due to constant data being sent.

I wonder if it will improve the reliability of the system. 1

[Brief explanation of drawings]

FIG. 1 is a block diagram of the Nth machine according to an embodiment of the present invention.
The figure shows a slave station and a slave station in an embodiment of the present invention. This is an overview of the operation of the internal monitoring unit. 1... Receiving section 2... Recognition section
56... Processing s 4... Transmission starting section
. 5... Transmission section 6... Transmission switch
. 7...Monitoring unit 8...Address rationality determination. 9...Transmission data rationality 10...Initialization judgment 11...Transmission judgment
l1112... Abnormality report 13... Counting unit 14... Timer 15... Holding control unit, 11.

Claims (1)

[Claims] 1. In a transmission control method of a data transmission system configured to determine a slave station paging signal transmitted from a master station and to send data from the slave station to the master station if the call is addressed to its own address, A means for confirming that the local station address is correctly recognized in the slave station and a means for confirming that the transmitted data does not cause abnormality in other slave stations or the transmission line is provided, and an abnormality is confirmed by these means. A transmission control method characterized by initializing the slave station, stopping data transmission, and reporting abnormality detection to the master station when the abnormality is detected.