JPH0778108A - Method for error processing by intermediate device for reference input/output interface - Google Patents

Abstract

PURPOSE:To improve the performance of an error processing method when an error occurs on an I/O device side in respect to an error processing method by a system provided with a channel device and 1st and 2nd intermediate devices for setting up the remote distance of an I/O interface for connecting plural I/O devices. CONSTITUTION:The 2nd intermediate device 31 detecting an error generated on the I/O device side executes selective reset operation for selectively resetting an I/O device 2 held at an error state prior to the operation of the channel device 1, inputs information indicating the generation of the error to a queue generated from the 1st intermediate device 30, and then connects the I/O device 2 to the channel device 1 by RQI connection issued based upon a connection request from the device 2 to inform the generation of the error to the device 1 by 'disconnect in' (DISCIN) indicating the disconnection of the current connected state instead of the report of 'status in' (STI).

Description

Detailed Description of the Invention

[0001]

[Industrial application] With the recent spread of data processing by computer systems, computerization of clerical work is progressing even in rural areas. In this case, an expensive computer system is not installed in rural areas, and terminal devices are not used. Only the (printer device, etc.) is connected and the central computer system is connected by a line.

With the recent rise in land prices, a computer system is constructed by placing a terminal device in the center of expensive land prices and placing a main unit in a rural area where land prices are low. This is due to the fact that high-speed lines have become available with the progress of line technology. However, a specified tag signal is sent and received to the input / output interface that connects the channel device and input / output device of the computer system. However, there is a problem in that the connection distance is not extended even if the above high-speed line is used.

Therefore, conventionally, a long distance communication system has been developed in which an input / output interface signal for connecting a channel device and a plurality of input / output devices is converted into a serial signal and an intermediate device for extending a connection distance is provided. However, in extending the communication distance, the number of responses of the input / output interface signals between the channel device and the input / output device appears as a product of the delay times, which is a factor that greatly reduces the installation distance.

Under such circumstances, the reason why a long-distance control method of a standard input / output interface that can extend the installation distance is required.

[0005]

2. Description of the Related Art FIGS. 2 and 3 are views for explaining a long-distance communication means of a conventional standard input / output interface.
FIG. 2A shows an example of connection configuration, FIG. 2B shows an example of exchange of input / output interface signals at the time of connection request (RQI) from an input / output device, and FIG. 3 shows an operation time chart of standard input / output interface signals of
(d) shows the conventional error handling method of the standard input / output interface. Further, FIG. 4 is a diagram for explaining the improved conventional long-distance communication means of the standard input / output interface, for example, showing the concept of the advanced control method of the standard input / output interface by the RQI connection of the input / output device, Figure 5
FIG. 9 is a diagram illustrating a conventional error processing method of an intermediate device during advance control of a standard input / output interface.

Conventionally, intermediate devices 30 and 31 for converting an input / output interface signal for connecting the channel device 1 and a plurality of input / output devices 2 and extending a connection distance are known, and FIG. Are connected as shown in. Here, the intermediate device on the side of the channel device 1 is called a first intermediate device, and the intermediate device on the side of the input / output device 2 is called a second intermediate device.

In this case, between the channel device 1 and the first intermediate device 30, or between the second intermediate device 31 and the input / output device 2, for example, an 8-bit bus line and a plurality of lines are provided. And the parallel line of the first intermediate device.
It is converted into a serial signal in 30 and sent to a predetermined high speed line, converted into an original parallel bus signal and a tag signal in the second intermediate device 31, and exchanged with the input / output device 2. It was

FIG. 2B shows an example of transmission / reception of an input / output interface signal from the input / output device 2, for example, when a connection request (RQI) is issued. First, the input / output device
From 2, the attention request by pressing the enter key, the connection request accompanying the device end (DE) at power ready,
Request input from the input / output device 2 due to a connection request etc. accompanying the device end (DE) when the data transfer is completed.
When (RQI) is activated, in response to the above request-in (RQI) from the channel device 1, the select-out (SLO) for recognizing the machine number of the transmitting device of the request-in (RQI).
When the input / output device 2 receives the select-out (SLO), the request-in (RQI) signal is dropped,
Operational Inn to show that you are connected
(OPI) and address-in (ADI) indicating that the machine number data is being output on the I / O interface bus, and the above machine number was received and recognized as a response signal from channel device 1. Command output (CMO) indicating that the I / O device 2 drops the address in (ADI) and outputs the data indicating its own state on the I / O interface bus in response. Send the indicated status in (STI).

The status in (STI) channel device 1
Is received, the response is Select Out (SLO)
The status of the above-mentioned input / output device 2 is received from the channel device 1 which has dropped, and a service out (SVO) instruction or the like indicating that an operation such as termination is to be performed is output.
The input / output device 2 which recognizes that 1 has dropped the select-out (SLO) drops the operational in (OPI) signal and performs the operation corresponding to the instruction from the channel device 1.

As described above, in the standard input / output interface, while the channel device 1 sends out the select out (SLO) and the input / output device 2 sends out the operational in (OPI) signal, the input / output with the channel device 1 is performed. Output device 2 is connected.

FIG. 3C shows the I / O device 2, the second intermediate device 31, the line, and the first intermediate device when the request-in (RQI) signal is sent from the I / O device 2. Device 3
0 schematically shows transmission / reception of the input / output interface signal between 0 and the channel device 1.

In the conventional method, as shown in FIG. 3 (c), each input / output interface signal is transmitted to the channel device 1
Between the input / output device 2 and the input / output device 2 via the first intermediate device 30 and the second intermediate device 31.

Therefore, as described above, in order to extend the communication distance, the number of responses between the channel device 1 and the input / output device 2 appears as a product of delay times proportional to the communication distance, and the installation distance is It is a factor that greatly reduces.

Specifically, for example, in the channel device 1, after receiving a request-in (RQI) signal from the input / output device 2, a timer (not shown) is started and a service-out (SVO) signal is output. The time until the completion is counted, and there is a problem that a timer-out error occurs if the communication distance between the channel device 1 and the input / output device 2 is long.

Further, if the occupation time of the input / output interface per one input / output device 2 increases, other input / output devices
The process of 2 could not be performed, which was also a factor that deteriorates the performance of the computer system.

In the conventional long-distance communication means of the input / output interface, when a failure occurs on the input / output device 2 side, as shown in FIG.
Channel device 1 outputs the disconnect in (DISCIN) signal output from 2 indicating that the current coupling state is released.
The channel device 1 which has sent out the disconnection (DISC IN) signal to the channel device 1 selectively resets the I / O device 2 in the fault state in order to disconnect the I / O device 2 in the fault state. Will be sent.

In such an input / output interface process, since the first intermediate device 30 and the second intermediate device 31 are connected over a long distance, the failure notification may be sent for several tens of ms, for example. I needed time.

Therefore, the applicant of the present invention has proposed a control method of a standard input / output interface by request-in (RQI) of an input / output device, which can economically eliminate the delay time due to the connection distance. 04-221
No. 803 “Preceding control method of standard input / output interface by RQI of input / output device”.

FIG. 4 shows the advanced control method of the standard I / O interface by the RQI of the improved I / O device. Specifically, channel device 1 and multiple I / O devices 2
First for long-distance installation of input / output interface for connecting to
In the intermediate device 30 and the second intermediate device 31 of the second intermediate device 31, the second intermediate device 31 requests the connection request (RQI) from the input / output device 2.
The input operation of the status of the input / output interface is started prior to the operation of the channel device 1, and the contents of the status are judged by the second intermediate device 31,
Only its status in (STI) is the first on the channel device side.
Channel device 1 and the first intermediate device 30 which have received the status-in (STI), and the second intermediate device 31 terminates the preceding interface work. The status of the input / output interface is fetched based on (STI), and the channel device 1 sends only the service-out instruction for the status-in (STI) to the second intermediate device 31, and the channel device 1 sends the service-out instruction. Based on the service out instruction, the second intermediate device 31 and the input / output device 2 are adapted to fetch the input / output interface.

FIG. 5 is a diagram for explaining a conventional error processing method of the intermediate device of the standard input / output interface. Figure 4
In the preceding control method of the standard input / output interface by the RQI of the input / output device, when the failure occurs in the input / output device 2, the disconnection (DISC IN) described above is sent to the second intermediate device 31. When an abnormality is notified by a signal, or when the second intermediate device 31 detects an abnormality of the input / output device 2, for example, a timeout or a sequence abnormality (for example, generation of an invalid tag signal), The second intermediate device 31 is connected to the input / output device 2
That a failure has occurred in the first intermediate device 30 is inserted into a predetermined failure frame and transferred to the first intermediate device 30, and the event that the I / O device 2 has failed is not shown in the first intermediate device 30. Put in the queue and connect to the channel device 1 by the above RQI connection.

Between the first intermediate device 30 and the channel device 1, the first intermediate device 30 and the channel device 1 are exchanged by the exchange of select-out (SLO) and operational-in (OPI) signals by the sequence processing described in FIG. Command out sent from channel device 1 when device 1 is connected
In response to (CMO: 00), instead of sending back the status in (STI), it sends back the disconnect in (DISC IN) using the failure information put in the queue.

Upon detecting the DISC IN signal, the channel device 1 recognizes the abnormality of the input / output device 2 and sends a selective reset signal in an attempt to repair the input / output device 2 in the abnormal state. To do.

[0023]

Therefore, in order for the signal of the selective reset to reach the input / output device via the first intermediate device 30 and the second intermediate device 31, the input / output device 2 is required. , It takes several tens of ms after sending out the DISC IN signal, during which the I / O device 2 remains in the fault state and remains connected to the second intermediate device 31, The second intermediate device 31 is also the first intermediate device.
Until the selective reset signal is received from 30, the failure event is held and the first intermediate device 30, the second intermediate device 31, the input / output device 2 during the period indicated by the diagonal lines in the figure. Is a faulty state, other operations cannot be performed, input / output processing from the preceding other channel device 1 cannot be accepted, and other preceding input / output device is not accepted. 2 or, there was a problem that the request from the new input / output device 2 could not be accepted.

In view of the above-mentioned conventional drawbacks, the present invention comprises a channel device, a first intermediate device for long-distance installation of an input / output interface connecting a plurality of input / output devices, and a second intermediate device. It is an object of the present invention to provide a method for improving the processing performance in the telecommunications system when an error occurs in the input / output device side in the error processing method in the system.

[0025]

FIG. 1 is a diagram showing an embodiment of the present invention. The above problems can be solved by the error processing method of the intermediate device of the standard input / output interface configured as follows.

An input / output device in a system including a channel device 1, a first intermediate device 30 for long-distance installation of an input / output interface for connecting a plurality of input / output devices 2, and a second intermediate device 31. In the second intermediate device 31, which has detected the error on the I / O device 2 side according to the error processing method data generated in 2, the error operation of the channel device 1 is preceded and the selective reset described above is executed. Is sent to the queue of the first intermediate device 30, and then the channel device is connected by the RQI connection described above.
Instead of combining with 1 and reporting status in (STI), disconnect in (DISC IN)
Configure to report error occurrences to 1.

[0027]

Function: That is, the channel device 1 and the plurality of input / output devices 2
First for long-distance installation of input / output interface for connecting to
In the telecommunications system including the intermediate device 30 and the second intermediate device 31 described above, for example, when the input / output device 2 requests the RQI connection, as described in FIG.
Prior to the standard I / O interface operation between the channel device 1 and the first intermediate device 30, the I / O device 2
And the second intermediate device 31, the preceding I / O interface operation (RQI → SLO → OPI, ADI → CMO → STI) is performed, and the status in ( STI), paying attention to transmitting the status of the RQI, in the present invention, in the preceding operation, the occurrence of a failure on the side of the input / output device 2 indicates that the input / output device 2 is When the second intermediate device 31 is notified by the aforementioned DISC IN,
Alternatively, when the second intermediate device 31 detects an abnormality in the input / output device 2 due to a time-out, a sequence abnormality, etc., the second intermediate device 31 precedes the error processing in the channel device 1. , The selective reset signal described above is returned to the input / output device 2,
Is released from the error state and, for the channel device 1, via the first intermediate device 30, the aforementioned RQI
Instead of a response at the status-in (STI) at the time of request, information indicating that an abnormality has occurred in the above I / O device is inserted in the fault frame and sent out, and a frame of information indicating that the fault has occurred. Are put into a queue (not shown) of the first intermediate device 30.

In the first intermediate device 30, the channel device 1
On the other hand, the RQI is used for connection (as described above, the channel device 1 and the input / output device 2 are connected while exchanging SLO → OPI), and the disconnection (DISC IN) notifies the channel device 1 of the occurrence of the error of the input / output device 1, and the channel device 1 sends the above-mentioned selective reset signal in response to the notification. In 30, as described above, the second intermediate device 31 and the input / output device 2 have the second intermediate device in view of the fact that the reset process by the error notification → selective reset signal is completed in advance process. By suppressing sending to the device 31, the error state of the input / output device 2, and the first intermediate device 30 and the second intermediate device 31 in which an error has occurred is promptly released. is there.

Therefore, it is possible to avoid the monopolization of the first intermediate device 30 and the second intermediate device 31 when an error occurs in the input / output device 2 in advance, and improve the performance of the telecommunications system. You can Further, when an error occurs, the possibility that the other input / output device is affected and the other input / output device cannot be immobilized is reduced, and the performance of the telecommunications system is improved.

[0030]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 described above is a diagram showing an embodiment of the present invention.

In the present invention, the channel device 1, the first intermediate device 30 for the long-distance installation of the input / output interface connecting the plurality of input / output devices 2, and the second intermediate device 3
An error handling method for the channel device 1 in the second intermediate device 31 which detects an error on the input / output device 2 side in the telecommunication system equipped with Prior to the above, the selective reset described above is executed, and the report that an error has occurred is queued in the first intermediate device 30 and then combined with the channel device 1 by the RQI connection, and the status in (STI)
Instead of reporting the
The means of reporting the occurrence of an error at C IN) to channel device 1 is the means necessary to implement the invention. still,
The same reference numerals denote the same objects throughout the drawings.

Hereinafter, referring to the preceding control operations of the standard input / output interface telecommunications system shown in FIGS. 2 to 5, the error processing method in the intermediate device of the standard input / output interface of the present invention will be described with reference to FIG. Will be explained.

As described above, in the long distance communication system of the standard input / output interface, the channel device 1 and the first intermediate device 30 for long distance installation of the input / output interface for connecting the plurality of input / output devices 2 are provided. The second intermediate device 31 is provided, and, for example, when the input / output device 2 requests an RQI connection, as described in FIG.
The standard I / O interface operation between 1 and the first intermediate device 30 is preceded by the standard I / O interface operation between the I / O device 2 and the second intermediate device 31.
(RQI → SLO → OPI, ADI → CMO → STI) is performed, and status in (STI) is applied to channel device 2.
Then, the status of the RQI is transmitted.

Therefore, in the present invention, the occurrence of a failure on the side of the input / output device 2 in the preceding operation or the like indicates that the above-mentioned disconnection from the input / output device 2 to the second intermediate device 31. When notified by IN (DISC IN), or when the second intermediate device 31 detects an abnormality of the input / output device 2 due to a timeout, sequence abnormality, etc., the second intermediate device 31 In the telecommunications system, the error notification in the channel device 1 is notified in the failure frame when the notification of the occurrence of the failure is connected to the channel device 1 by the above-mentioned RQI connection. , Channel device 1, RQI → SLO → OPI, ADI
→ CMO → DISC IN → Selective reset to release I / O device 2.
Prior to the error processing in 1, the selective reset signal is returned to the input / output device 2 to
2 is immediately released from the error state, and the above-mentioned input is sent to the channel device 1 through the first intermediate device 30 in place of the response in the status-in (STI) at the time of the RQI request described above. Information indicating that an abnormality has occurred in the output device 2 is inserted into a fault frame and transmitted, and a frame of information indicating that the fault has occurred is stored in a queue (not shown) of the first intermediate device 30. It is turned on and connected to the channel device 1 by the RQI connection (as described above, the channel device 1 and the input / output device 2 are connected while exchanging SLO → OPI), and in the meantime. , The channel device 1 is notified of the occurrence of an error in the input / output device 1 by the above disconnect in (DISC IN).

Therefore, the channel device 1 sends out the above-mentioned selective reset signal in response to the notification, but in the first intermediate device 30, as described above, the second
In view of the fact that the reset process by the error notification → selective reset signal between the intermediate device 31 and the input / output device 2 of the above is completed by the preceding process, transmission to the second intermediate device 31 is suppressed. Thus, the error states of the input / output device 2 and the first intermediate device 30 and the second intermediate device 31 in which the error has occurred are quickly released.

Since the operation is performed in this way, as described in FIG. 5, even in the telecommunications system having the improved standard input / output interface, if a failure occurs in the input / output device 2, the channel device 1 causes the above-mentioned Until the selective reset signal was sent out, the error state was left and the system was hung up. However, by performing the advance control by the second intermediate device 31 according to the present invention when the error occurs, the input / output device 2 , Second intermediate device 31, further, first intermediate device
30 also includes a second intermediate device 3 as shown in FIG.
1 becomes operable from the time when the above-mentioned selective reset signal is issued to the input / output device 2, and the first intermediate device 30 and the second intermediate device 31 are preceded by data prefetching and the like. Operation is not interrupted,
It is possible to improve the usage efficiency of the intermediate device in the long-distance communication system of the standard input / output interface and the input / output device which does not cause any trouble.

[0037]

As described above in detail, according to the error processing method in the intermediate device of the standard input / output interface of the present invention, the first intermediate device 30 when an error occurs in the input / output device 30. Therefore, the occupation of the second intermediate device 31 can be avoided in advance, and the performance of the telecommunications system can be improved. Further, when an error occurs, the possibility that the other input / output device is affected and the other input / output device cannot be immobilized is reduced, and the performance of the telecommunications system is improved.

[Brief description of drawings]

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

FIG. 2 is a diagram (part 1) explaining a long-distance communication means of a conventional standard input / output interface.

FIG. 3 is a diagram (part 2) explaining a long-distance communication means of a conventional standard input / output interface.

FIG. 4 is a diagram illustrating an improved conventional long-distance communication means of a standard input / output interface.

FIG. 5 is a diagram explaining a conventional error processing method of an intermediate device of a standard input / output interface.

[Explanation of symbols]

1 Channel device 2 Input / output device (I / O) 30 First intermediate device 31 Second intermediate device ROI Request-in (connection request) SLO Select-out OPI Operation-in CMO Command-out SVO Service-out Selective reset Disconnect-in (DISC) IN)

Claims (1)

[Claims] 1. A channel device (1) and a plurality of input / output devices
An input / output device (2) in a telecommunications system comprising a first intermediate device (30) for long-distance installation of an input / output interface connecting (2) and a second intermediate device (31). A second intermediate device which is an error processing method that has occurred and which has detected an error on the input / output device (2) side.
In (31), prior to the error operation of the channel device (1), the selective reset signal () that selectively resets the I / O device (2) in the error state is executed, and the I / O device (2) ) Is reset, and a report that an error has occurred in the input / output device (2) is put into a predetermined queue of the first intermediate device (30), and then the first intermediate device (30) A channel device by performing a request-in (RQI) connection issued by a connection request from the I / O device (2)
(1) and the status in (S
Instead of reporting (TI), the report that indicates that an error has been submitted to the above queue has been disconnected (DISC IN) that indicates that the current binding state is to be released.
An error processing method of the intermediate device of the standard input / output interface, characterized in that it is reported to the channel device (1) in ().