JPS6081667A - Fault informing method of data processor - Google Patents

Abstract

PURPOSE:To inform a fault and to prevent the repeat of useless retransmission of data by transmitting a fault informing frame without retransmitting data repeatedly more than the prescribed number of times when the number of transmission reaches the prescribed number of times. CONSTITUTION:When a response frame to a frame transmittd to a data processor 33 is not received and a transmission timer 109 is made time-out, the timer 109 informs said state to a control circuit 108 and counts up a counter 110. When the counted value of the counter 110 reaches a prescribed value, an FF 111 is set up. Receiving the time-out of the timer 109, the circuit 108 checks the FF111, and when the FF111 is set up, refers the transmitting address X1 of the frame stored in a receiving data buffer 105, allows a transmission register 107 to generate a fault informing frame and starts a transmission circuit 102 to transmit the fault frame to a data processor 31 which is a transmitting source through the transmission circuit 102.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a data processing bag W fault notification system for a digital data transmission device.

[Description of prior art]

In a data transmission system in which a plurality of data processing apparatuses located at remote locations are connected to a transmission line via a data transmission apparatus to perform distributed processing, these data processing apparatuses are often operated unmanned.

In this case, even if a certain data processing device breaks down or the power is cut off due to a power outage, other data processing devices cannot detect this. Therefore, when transmitting data, even if there is no response due to a failure or power outage of the data processing device at the transmission source, there is a drawback that retransmission is repeated pointlessly.

[Purpose of the invention]

The present invention solves the above-mentioned drawbacks and provides data processing device failure of a data transmission device that notifies a source data processing device of a destination data processing device failure in order to avoid repeated meaningless retransmissions. The purpose is to provide a notification method.

[Features of the invention]

The present invention provides a holding means for temporarily holding received data in each of a plurality of data transmission devices each connected to a data processing device and mutually connected via a common transmission line;
A clock means for transmitting the received data held in the holding means to the data processing device of the local station and measuring the time until a response message is received; In the data transmission device comprising retransmission means for retransmitting the received data held by the holding means when a counting means for counting; a storage means for storing that the number of times counted by the counting means has reached a predetermined number; The present invention is characterized by comprising means for creating a failure notification frame and transmitting the failure notification frame to the transmission source data processing device when the failure notification frame is received.

[Explanation based on examples]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a loop data transmission system including a data processing device failure notification device according to the present invention. Figure 1 shows a loop-shaped transmission line as a common transmission line.
An example is shown in which four data transmission devices are connected to this.

In FIG. 1, data processing devices 31.32.3B and 34 are connected to a loop-shaped common transmission line 1 via data transmission devices 21.22.23.24, respectively.

FIG. 2 is a block diagram of a data processing device failure notification device according to an embodiment of the present invention. In FIG. 2, the common transmission line 1 is connected to the input of the receiving circuit 101 and the output of the transmitting circuit 102 of the data transmission device 2, respectively. The input of the receiving circuit 103 and the output of the transmitting circuit 104 of the data transmission device 2 are respectively connected to a data processing device 3 (not shown). At the output of the receiving circuit 101, a receiving data buffer 10 is provided.
5 is connected.

One output of the reception data buffer 105 is connected to the transmission circuit 1.
Connected to 04. The output of the receiving circuit 103 is connected to a receiving data buffer 106. Received data Hanofa 1
The other output of 05 is connected to transmit register 107.

Output of receive data buffer 106 and transmit register 107
The output of is connected to the input of the transmitting circuit 102. The control circuit 108 is connected to the receiving circuit 10 via each control line.
1, a control signal b from the reception data buffer 105, a control signal C from the transmission timer 109, a control signal d from the Pfronop 111, and a control signal e from the reception circuit 103, respectively. From the control circuit 108,
Control signals f and g are sent to the reception data expander 105, control signal h to the transmission register 107, control signals i and j to the transmission timer 109, and control signal k to the counter 110 through the respective control lines. A control signal P is sent from the transmission timer 109 to the counter 110 via a control line.

A control signal m is sent from the counter 110 to the flip-flop 111 via a control line. The data processing device failure notification device 112 of the present invention includes a transmission register 107, a counter 110, a flip-flop 111, and a control circuit 1.
Consists of 08.

The operation of the data processing device failure notification device configured as described above will be explained in detail using FIGS. 1 and 2.

First, in FIG. 1, a case will be described in which the data processing device 31 at address X1 transmits a data frame to the data processing device 33 at address X3. ) frame to the data processing device 33. This frame is received by the data transmission device 23 via the data transmission device 21 and the common transmission line 1.

In FIG. 2, a frame sent via the common transmission line 1 is first transmitted to the receiving circuit 1 of the data transmission device 23.
Received at 01. When the receiving circuit 101 detects a frame addressed to the data processing device 33 connected to its own station, it sends out a control signal a to notify the control circuit 108 of this fact.
The control circuit 108 sends a control signal f instructing the receive data buffer 105 to take in the received frame, and stores the frame in the receive data buffer 105.

When the control circuit 108 is notified by the control signal S from the reception data buffer 105 of the end of the frame storing operation in the reception data buffer 105, the control circuit 108 controls the flip-flop 111.
If it has been sent, refer to the source address , the failure notification frame is transmitted via the transmission circuit 102 to the data processing device 31 that is the transmission source of the received frame.

If the flip-flop 111 is not loaded, the control circuit 108 activates the reception data buffer 105 using the control signal g, and simultaneously transmits the received frame to the data processing device 33 via the transmission circuit 104. The timer 109 is activated from the control signal.

When the receiving circuit 103 receives a response frame from the data processing device 33 to the frame transmitted to the data processing device 33, the receiving circuit 103 notifies the control circuit 10 of this using a control signal e.
In response to this, the control circuit 10 stops the timer 109 using the control signal j, and further resets the counter 110 using the control signal k.

If the timer 109 times out without receiving a response frame to the frame transmitted to the data processing device 33, the timer 109 indicates that the control signal C
At the same time, the counter 1 is notified to the control circuit 108 by
Control signal 10! 114F1 performs count amplification. If the counter 110 reaches a predetermined value using the count amplifier, the counter 110 switches the flip-flop lli according to the control signal m.

When the control circuit 108 is notified of the timeout by the control signal C, it checks the flip-flop 111, and if it is set, refers to the source address X1 of the frame stored in the reception data buffer 105, causing the sending reno star 107 to generate a failure notification frame,
It is activated by a control signal and transmits a failure notification frame to the data processing device 31, which is the source of the received frame, via the transmission circuit 102.

If the flip-flop 111 is not connected, the control circuit 108 activates the reception data buffer 105 by the control signal g, and retransmits the received frame to the data processing device 33 via the transmission circuit 104. At the same time, timer 109 is activated again by control signal 1.

In the above description, a flip-flop is used as a means for storing that the counter has reached a predetermined value, but a RAM, a register, etc. may also be used. Further, as for the applicable data transmission system, although a system equipped with a loop-shaped transmission line has been given as an example, various other transmission lines may be applied. For example, there may be a lotus-shaped transmission path. FIG. 3 shows a lotus-shaped data transmission system including the data processing device failure notification device of the present invention. FIG. 3 shows an example in which the loop-shaped transmission line 1 in the example of the data transmission system shown in FIG. 1 is replaced with a lotus-shaped transmission line 201. The data processing device 203 corresponds to the data processing device 3 in FIG. 1, and the data transmission device 202 corresponds to the data transmission device 2 in FIG. Note that the operation of the data transmission device 202 in FIG. 3 is completely different from that of the data transmission device 2 in FIG. 1.

〔Effect of the invention〕

As described above, the present invention provides a data transmission system that does not retransmit data more than a predetermined number of times and transmits a failure notification frame when the number of transmissions reaches a predetermined number of times. This has the excellent effect of notifying the source data processing device of a failure in the source data processing device without repeatedly retransmitting meaningless data. This is extremely effective especially when data transmission to a specific data processing device is concentrated.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a loop data transmission system including a data processing device failure notification device according to the present invention. FIG. 2 is a block diagram of a data processing device failure notification device according to an embodiment of the present invention. FIG. 3 is a professional configuration diagram of a lotus-shaped data transmission system including the data processing device failure notification device of the present invention. DESCRIPTION OF SYMBOLS 1... Loop-shaped common transmission line, 2.202... Data transmission device, 3.203... Data processing device, 101
...Reception circuit from the common transmission line, 102...Transmission circuit to the common transmission line, 103...Reception circuit from the data processing device, 104...Transmission circuit to the data processing device, 105... - Reception data buffer from the common transmission line, 106... Reception data buffer from the data processing device, 107... Transmission register, 108... Control circuit, 109... Transmission timer, 110... Counter,
111...Flip-flop, 201...Lotus-shaped transmission line. Patent applicant NEC Corporation Representative Patent attorney Takashi Ide 2 Figure 3 Figure 3

Claims (1)

[Claims] (1) Each of a plurality of data transmission devices connected to a data processing device and mutually connected via a common transmission line has a holding means for temporarily holding received data, and a holding means for temporarily holding received data, and a timer for measuring the time from transmitting the received data to the data processing device of its own station to receiving a response message thereto; and a retransmission means for retransmitting the received data held by the retransmission means, each of the plurality of data transmission apparatuses further comprising: a counting means for dividing the number of retransmission operations by the retransmission means; , a storage means for storing that the number of times counted by the counting means has reached a predetermined number; and a storage means for storing that the number of times counted by the counting means has reached a predetermined number of times; A data processing device fault notification method, comprising means for creating a fault notification frame and transmitting the fault notification frame to a source data processing device.