JPS62111545A - Terminal equipment supervisory system for data transmission system - Google Patents

Abstract

PURPOSE:To detect a fault in a terminal equipment by informing a data representing the own equipment to be effective from a terminal equipment to a central unit or the like so as to discriminate an effective address without undesired data transmission. CONSTITUTION:When terminal equipments 8-10 are in the mode state, an initial data including the own address is sent to the central unit 1. When a supervisory control section 7 uses a reception section 5 to detect the initial data, the terminal equipment address at that time is registered in a table 6. Then the transmission/reception of a supervisory data is executed periodically between the central unit 1 and the terminal equipment having an effective address registered in the table 6. If malfunction takes place in any of the terminal equipments 8-10, the reception section 5 and the control section 7 detect it and it is processed by interruption. Thus, runaway of the CPU 2 due to an erroneous data or the destruction of data in a main memory 3 is prevented.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a monitoring method for a terminal device (17) in a central device or relay device of a data transmission system, and is particularly suitable for monitoring and storing effective addresses specific to each terminal device. This invention relates to a monitoring method for terminal devices.

[Background of the invention]

In a system in which data is transmitted between a central device or a relay device and multiple terminal devices that are branch-connected via a transmission concave side and each has a unique address, the maximum number of terminal devices is determined at the time of system construction for targeting purposes. The address capacity of the central device or relay device is determined accordingly. However, it is rare to connect terminal devices to the maximum address capacity, and there is often a large difference between the number of connected terminal devices and the number of address capacities.

Therefore, a challenge in this type of system is to efficiently separate addresses to which a terminal device is connected (hereinafter referred to as valid addresses) and addresses to which no terminal device is connected (hereinafter referred to as invalid addresses).

As a countermeasure to this problem, Japanese Patent Application Laid-Open No. 59-127448
The conventional terminal device monitoring method proposed in the issue will be explained with reference to FIGS. 3 and 4. Figure 3 is a system configuration diagram,
The central side 1 includes a CPU 2, a king memory 3, and a superstition section 4 connected to these. Receiving section 5. Consists of address table 6 and address counter 11, no rice bag fit 8
, '9, and '10. So(-, 4th
As shown in the figure, each address transmitter is sent from a solid device (or medium-sized device) 1, and in response, each terminal device 8
In ~10, by retransmitting the received address of the own terminal device, the central device or relay device stores addresses that do not respond as invalid addresses IJH, and stores data only about the valid addresses separated in this way. Sending and receiving. According to this, the central device or the relay device can respond to the Ruse of the terminal device without changing the address capacity each time, and can eliminate invalid addresses without any intervention such as manual operation. A central device or a relay device can be expected to have great effects in terms of improving maintainability and standardization. However, this conventional system has the following problems.

(1) Address transmission must be performed even for invalid addresses, and the proportion of wasted time increases as the number of valid addresses is smaller compared to the address capacity.

(2) If a response cannot be returned to the address sent from the central device or relay device due to malfunction or abnormality of the terminal device, the central device or relay device will judge this as an invalid address and will not be able to send or receive data. Not only is this not performed, but the address is simply determined to be an invalid address, and the failure cannot be recognized, which poses a problem in terms of performance. The problem of not recognizing a failure as a failure may result in the transmission line itself being adversely affected by the influence of the failed terminal device, and in this case, the system may go down for unknown reasons.

(3) In general, considering the purpose of this system (measurement, monitoring, etc.), it is unlikely that the number of terminal devices or addresses will change from moment to moment, and therefore, each time data is sent and received, the address is valid or invalid. It is useless to judge.

[Purpose of the invention]

The purpose of the invention is to provide a terminal device monitoring method that can effectively determine a valid address without sending unnecessary data in a data transmission system, and can detect when a terminal device failure occurs. It is about providing.

[Summary of the invention]

In order to achieve the above object, in the present invention, in order for the intermediate address or the relay device to know the valid address, data indicating that the self is valid is made known to the central address or the intermediate device from the terminal device. composition.

In addition, we will constantly monitor the addresses that have been determined to be valid by the central copy:β or by the relay device 711.
Monitoring redata is sent and received between the central device or relay device and the terminal device.

Therefore, for example, if the monitoring section is realized by a microprocessor, it becomes possible to process the recording data and supervise the data for Q self-addresses 1 from each terminal device. In addition, if the microprocessor's weight is lighter, it becomes possible to decentralize the processing of transmission and reception control in the central unit or relay equipment, which was previously performed by the main processing unit, and it is possible to improve the performance of the system as a whole. become.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. In this embodiment, the solid device 1 (the same applies to the relay device, so the description thereof will be omitted) includes a CPU 2 that performs processing and system control as a solid device, a main memory 6 used by the CPU'2, and each other. A transmitting unit 4 that transmits data to the terminal devices 8.9 to 10, a receiving unit 5 that receives data from each terminal device 8.9 to 1o, an address table 6 that stores the address of each terminal device, and each terminal device. -1118,9
10 and a monitoring control section 7 that monitors each terminal device address and controls transmission and reception.

In this embodiment, when each terminal device 8.9 to 1o enters the mode state by turning on the power or performing a mode setting operation, first, as shown in FIG. 2, initial data including its own address is sent to the central gt1. do. When the monitoring control unit 7 detects this initial data in the receiving unit 5, it treats this as an interrupt process and registers the terminal device address at this time in the address table B. Thereafter, monitoring data is periodically sent and received between the terminal device having a valid address registered in the address database and the middle mounting unit 1t1, and this is monitored by the monitoring control unit 7. Terminal device 8.9-10
If a malfunction abnormality occurs in any of the above, the monitoring control unit 7 detects this in the receiving unit 5 and handles it by interrupting. At this time, by detecting the abnormal data in the receiving section 5, the CP
This prevents U2 from running out of control and data in the king memory 5 from being destroyed. When the abnormality in the terminal device is recovered, the monitoring data also returns to normal, so that the monitoring control unit 7 continues to monitor the terminal device at Celsius again. This is also monitored by the monitoring control unit 7 when the power of the terminal device is turned off or when the local mode is set.
Detect and process. The monitoring side 011 unit 7 controls transmission and reception between the center i1 and each terminal terminal 8, 9 to 100, except for interrupt processing based on the terminal 5A position monitoring.

According to this embodiment, the transmission and reception processing between the terminal devices 8.9 to 10 and the solid device, which was conventionally performed by the CPU 2, can be distributed to the processor of the monitoring + flJ control section 7. This has the effect of reducing the processing load on the CPU2, thereby improving the processing performance of the entire system.

〔Effect of the invention〕

According to the present invention, there are the following effects.

(1) Since unnecessary address data etc. are not sent from the relay device to the terminal device, unnecessary line occupancy is eliminated and each terminal device also has its own address data for data more than necessary. There is no longer a need to check whether or not 1 liter is present, which reduces the processing load on the entire system and improves performance.

(2) Transmission times [Co., Ltd.] by Shioda similar to (1) above
can be operated more efficiently in terms of time, and the pillar ≠ property is improved.

(3) Addition and deletion of addresses, etc. are programmable, and there is no need to interrupt system operation and reconfigure, improving maintainability and expandability.

(4) Reliability and stock availability are improved because address deletion and failure detection of terminal devices can be performed without human intervention.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram according to an embodiment of the present invention, and FIG.
The figure shows an operation flowchart of the terminal device and the solid device monitoring and control unit in the first embodiment shown in the first column, FIG. 3 is a configuration diagram of the conventional method, and FIG. . 1...Solid device 2...CPU3...Main memory 4...Transmitter 5...Receiver
6...Address table number? fork

Claims (1)

[Claims] Branch connected to the central device or relay device and on the transmission line,
In a data transmission system that sends and receives data between multiple terminal devices having unique addresses, each terminal device is provided with a function to send its own address when the power is turned on, and to send and receive monitoring data during operation, A terminal device monitoring method for a data transmission system, characterized in that a central device or a relay device is provided with a monitoring control unit for managing registration and deletion of terminal device addresses, detecting terminal device failures, and controlling transmission and reception.