JPH0644256B2 - Information communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is used in the field of digital information communication.

The present invention relates to a terminal and a computer system connected to a CPU system composed of at least one CPU via a communication line, and more particularly to an information communication system capable of automatically checking the state of the communication line. .

〔Overview〕

The present invention provides an information communication system including a CPU system, a terminal connected via a bus of the CPU system, and a communication processing device for controlling a computer system, and each CPU constituting the CPU system and the CPU. A diagnostic device is connected between the buses, respectively, and periodically when the user program means in the CPU is not accessing the communication line or when the user program means inputs a message from the communication line, the terminal and When the line status is changed without reducing the processing capacity of the entire system by checking the line status by sending and receiving a test message to the computer system and modifying the line usage management table in the CPU based on the result. The status can be immediately notified to the user program means. That.

[Conventional technology]

FIG. 7 is a block diagram showing an example of a conventional information communication system. In FIG. 7, 100 is a CP including user program means 101 and input / output service means 102, respectively.
CPU system composed of U300 and 301, 107 is a communication control unit, 108 and 109 are modems, 110 is a terminal,
111 is a communication line, 112 is a computer system, and 120 is a bus.

Conventionally, in the CPU system 100 composed of this kind of multi-CPU, the trigger for checking the state of the communication line 111 is only at the time of message input / output from the user program means 101. Therefore, at the time of input, in the case of a line failure, no message was input and the user program means 101 was in a waiting state. That is, the change in the line status was not immediately notified to the user program means 101.

[Problems to be solved by the invention]

The terminal 110 and the computer system 112 which are connected to the above-mentioned conventional CPU system 100 through the communication line 111.
In the above, since the user program means 101 regularly checks the state of the communication line 111, the access from the user program means 101 to the communication line 111 becomes high, and by extension, the processing capacity of the entire system composed of the CPU. There was a drawback that caused the decrease of.

Moreover, there is a drawback that the user program means 101 is not immediately notified of the change in the line state.

It is an object of the present invention to eliminate the above-mentioned drawbacks so that the line status can be inspected without deteriorating the processing capacity of the entire system, and the change of the line status is immediately notified to the user program means. The purpose of the present invention is to provide an information communication system capable of performing the inspection.

[Means for solving problems]

The present invention includes a user program means for storing a user program and performing control based on the program, and an input / output service means for processing a line input / output request from the user program means, commonly connected to one bus. An information communication system including a CPU system configured by at least one CPU, and a communication control device for controlling a terminal or a computer system connected to the bus via a communication line, Includes a line management table means for storing and managing a line management table for managing the availability of the communication line, connected between the bus and the CPU, and when the status of the terminal or the computer system is online, the terminal or the Check by sending and receiving test messages periodically with the computer system, Characterized by comprising a diagnostic device for correcting the serial line management table.

[Action]

The diagnostic device sends a terminal test message to the terminal (including the computer system) in response to a terminal monitoring request output when the input / output service means receives an input request from the user program means, and a response from the terminal is sent. Check the line condition to see if the message is valid. This inspection is repeated at regular time intervals by, for example, timer means. If the line status changes, the user program means is notified by correcting the line management table means in the CPU so that it cannot be used.

Therefore, the line status is inspected regularly by the diagnostic device when the user program means is not accessing the terminal and the computer system or when a message is input from the line. It is possible to notify the user program means immediately when the line state changes without causing a decrease.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

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

In this embodiment, a user program means 101 for storing a user program and controlling it, and an input / output service means for processing a line input / output request from this user program means.
Two C's including 102 and commonly connected to one bus 120
CPU system 100 composed of PU300 and 301
In the information communication system including the terminal 110 and the computer system 112 connected to the bus 120 and the communication line 111 via the modems 108 and 109, the CPUs 300 and 301 communicate with each other. Line
A line management table means 103 for storing and managing a line management table for managing the availability of 111 is connected between the bus 120 and each CPU 300 and 301, and the state of the terminal 110 and the computer system 112 is online when the terminal 110 and A diagnostic device 105 is provided for performing inspection by periodically transmitting and receiving a test message to and from the computer system 112, and correcting the line management table according to the result.

In FIG. 1, 106 is a timer for notifying the diagnostic device 105 of the inspection time at regular intervals.

The feature of the present invention is that the line management table means 103 and the diagnostic device 105 are provided in FIG.

Next, the operation of this embodiment will be described with reference to FIGS. 2, 3, and 4.
This will be described with reference to FIGS. 5, 5 and 6 (a), (b), (c) and (d). Here, FIG. 2 is a block configuration diagram showing line connection, FIG. 3 is input from a terminal, FIG. 4 is a line state transition, and FIG.
(a) is a flow chart showing the operation of FIG. 2, (b) of FIG. 3, (c) of FIG. 4 and (d) of FIG. 5, respectively.

2 to 5, the CPU system is shown.
Reference numeral 150 indicates a case where one CPU 250 is used.

[Connection of line] As shown in FIG. 2 and FIG. 6 (a), the user program means 101 communicates with the input / output service means 102 through a communication line.
A connection request 111 is issued (step S11). Based on the request, the input / output service means 102 checks the line status in the line management table means 103 (step S12). If the line status is available, the terminal 110 is switched to C through the communication control device 107.
Connect to the PU system 150 (step S13). If it cannot be used, return to the previous step. Input / output service means 102
Sets the connection result of the terminal 110 in the line management table means 103 on its own CPU 250, and at the same time notifies the user program means 101 of the completion (step S14). After that, in the case of a multi-CPU system composed of a plurality of CPUs 250, the line management table means 10 in each CPU
In order to measure the consistency of 3, the input / output service means 102 requests the diagnostic device 105 to transmit the line state information (step S15). However, in FIG. 2, the CPU is 1
Since it is a stand, the diagnostic device 105 uses the line status information for other CPUs.
Do not send to diagnostic device 105.

[Input from Terminal] As shown in FIGS. 3 and 6 (b), the user program means 101 issues an input request to the input / output service means 102 (step S21). Based on the request, the input / output service means 102 issues a terminal monitoring request to the diagnostic device 105 (step S22). Next, the diagnostic device 105 sends a test message to the terminal 110 through the communication control device 107 (step S23). The diagnostic device 105 receives the response message from the terminal 110 and checks whether the response message is valid (step S24). If appropriate, diagnostic device 105
Issues a periodic clock request to the timer 106 to obtain the next inspection timing (step S25). If it is not valid, go back to the previous step. After that, the diagnostic device 105 periodically checks the state of the terminal 110 by the timer 106 (step S26).

[Line state change] As shown in FIGS. 4 and 6 (c), the diagnostic device 105
Receives a start request from the timer 106 periodically (step S31). As a result, the diagnostic device 105 checks the state of the communication line 111 in the line management table means 103 (step S32), and if it is available, the terminal is passed through the communication controller 107.
A test message is transmitted to 110 (step S33).
If it cannot be used, return to the previous step. At this time, as shown in FIG. 4, when the communication line 111 becomes unusable due to a failure, the communication control unit 107 knows that the state of the communication line 111 has changed, and the diagnostic device Notify 105 of the state change of the communication line 111 (step S3
Four). The diagnostic device 105 checks the line shift from the notification, and disables the line state in the line management table means 103 of its own CPU 250 (step S35).

[Disconnection of line] Finally, as shown in FIGS. 5 and 6 (d), the user program means 101 requests the input / output service means 102 to disconnect the terminal 110 as shown in FIG. Is output (step S41). Based on the request, the input / output service means 10
2 issues a terminal monitoring end request to the diagnostic device 105 (step S42). Then, the input / output service means 102
The terminal 110 is transferred to the CPU system 15 through the communication control unit 107.
It is separated from 0 (step S43). And then the diagnostic device
105 requests the timer 106 to cancel the periodic clock request (step S44). Input / output service means 10
2 returns a normal end notification to the user program means 101 (step S45).

By the above series of flow, the status inspection of the terminal 110 and the computer system 112 is automatically performed when online.

〔The invention's effect〕

As described above, according to the present invention, in the information communication system including the terminal connected to the CPU system via the communication line and the terminal connected to the computer system via the communication line and the computer system, the user program means is provided. When the communication line is not being accessed, or when the user program means inputs a message from the communication line, the entire system is checked by periodically sending and receiving a test message to and from the terminal and the computer system. Without degrading the processing capacity of
When the state of the line changes, there is an effect that the state can be notified to the user program means.

Further, since the user does not need to create the line diagnostic program, there is an effect that the program development cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is an explanatory diagram showing the connection of the line. FIG. 3 is an explanatory view showing an input from the terminal. FIG. 4 is an explanatory diagram showing the line state transition. FIG. 5 is an explanatory diagram showing the disconnection of the line. 6 (a) to 6 (d) are flow charts showing the operation. FIG. 7 is a block diagram showing a conventional example. 100, 150 ... CPU system, 101 ... user program means, 102 ... input / output service means, 103 ... line management table means, 105 ... diagnostic device, 106 ... timer, 107 ... communication control device, 108, 109 ...... Modem, 11
0 ... terminal, 111 ... communication line, 112 ... computer system, 120 ... bus, 250, 300, 301 ... CPU, S11
-S15, S21-S26, S31-S35, S41-S45 ... Step.

Claims (1)

[Claims] 1. A user program means (101) for storing a user program and performing control based on the program,
A CPU system including at least one CPU (300, 301) commonly connected to one bus, including an input / output service means (102) for processing a line input / output request from the user program means; An information communication system comprising a communication control device for controlling a terminal or a computer system connected to the bus via a communication line, the CPU stores a line management table for managing the availability of the communication line. Line management table means for storing and managing (10
3), which is connected between the bus and the CPU and inspects the state of the terminal or the computer system by transmitting and receiving a test message periodically with the terminal or the computer system when online, An information communication system comprising a diagnostic device (105) for correcting the line management table according to a result.