JPH0374947A - Method and equipment for selecting normal relay line in duplex relay line - Google Patents

Abstract

PURPOSE:To easily improve the reliability by using two control circuits to monitor a duplexed relay line, monitoring a line decided to be a normal line and selected by a main control circuit and allowing the two control circuits to apply redecision in the case of abnormality. CONSTITUTION:The output signal of a host computer 1 is outputted to 1st and 2nd relay line 2, 3. The 1st and 2nd relay lines 2, 3 monitor 1st and 2nd control circuits 12, 13 and the control circuits 12, 13 output normality deciding output signals 17, 18 of the relay lines 2, 3 when the lines are decided to be normal and input the signals to an input selection discriminator 15 and a main control circuit 11. The input selection discriminator 15 inputs a signal 7 selecting the relay line decided to be normal to a selection switch 8 and the main control circuit 11 to output the signal to a relay output line 4. The main control circuit 11 monitors the relay output line 4 and sends the reset signals 19, 20 when the abnormality is decided to allow the control circuits 12, 13 to apply redecision.

Description

[Detailed Description of the Invention] [Field of Industrial Application] In order to improve the reliability of the relay line for data communication, the present invention aims to improve the reliability of the relay line for data communication. The present invention relates to a method and apparatus for selecting a normal relay line in a judgment 1 when selecting a relay line for relay output.

[Conventional technology]

FIG. 4 is an explanatory diagram of a first example of a conventional method and apparatus, in which data is sent from a host computer l to both or either one of the first and second trunk lines 2 and 3,
The relay line selection switch 8 is switched by the relay line selection signal 7 outputted from the control circuit 9 to select, for example, the normal first relay line 2, output data to the relay output line 4, and use this relay output as a relay output monitor. The control circuit 9 monitors the data through the line 10, and if the control circuit 9 determines that the data is abnormal, it switches the relay line selection switch 8 by changing the relay line selection signal 7 outputted from the relay line 3, and selects, for example, the second relay line 3.
is connected to the relay output line 4. 21 is a data repeater.

FIG. 5 is an explanatory diagram of a second example of the conventional method and apparatus, in which the control circuit 9 is connected to the first. The second relay lines 2 and 3 are simultaneously connected to the first relay line. Monitoring is carried out through the second trunk line monitor line 5.6, which outputs the trunk line selection signal 7, and the trunk line selection switch 8 selects a normal line from the back of the first and second trunk lines 'fa2.3'. It is selected and connected to the relay output line 4.

FIG. 6 is an explanatory diagram of a third example of the conventional method and apparatus, in which the first to third control circuits 12 to 14 control the first to third control circuits 12 to 14, respectively. The second relay lines 2 and 3 are connected to the first relay lines 2 and 3. The first to third control circuits 12 to 14 are monitored via the second trunk line monitor line 5.6. Second trunk line normality judgment output 17
, 18 are input to the input selection determiner 15, and this determiner 1
The relay line selection switch 8 is switched by the repeater 414 selection signal 7 output from the repeater 414 to select the first. Either one of the second trunk lines 2.3 is selected.

Input selection determination 2H15 in this third conventional example
If there are two or more determinations that the trunk line 2 or the second trunk line 3 is normal, that trunk line is determined to be normal.

[Problem to be solved by the invention]

Above 1. In the second conventional example, if the control circuit 9 fails or the microprocessor sensor of the host computer 1 goes out of control, the repeater line selection signal 7 may not select a normal line, or the first. The second trunk line 2.3 will be alternately selected, and there is a risk that momentary data interruption will occur during switching.

Further, in the third conventional example, the first to third control circuits 12
Even if one of the 14 is out of order, there will be no error in judgment because it will be a majority decision with the other two, but there is a problem in that three control circuits will be required.

Furthermore, since the relay output line is not monitored, there is a problem in that it is impossible to confirm whether or not the relay line selection switch 8 is operating normally.

In order to solve the latter problem, it is necessary to add one more control circuit and monitor the relay output line 4.

In this case, complete monitoring is possible, but there is a problem in that four control circuits are required.

[Means to solve the problem]

The present invention was made to solve the above problems,
By using three control circuits, even if one of the circuits becomes abnormal, it is possible to select a normal line, and by monitoring all relay lines and lines after selection switching, a highly reliable circuit is constructed. The present invention provides a method and apparatus for selecting a normal small group line in a duplex trunk line.

That is, the method of the present invention uses a duplicated first .
Trunk line i! which switches between the normal trunk lines of the second trunk lines 2 and 3 by inputting the trunk line selection signal 7! In the method of selection using the iR switch 8, two first . Second
The trunk line 2.3 is connected to two first . Second control circuit 12,1
3 to determine the normal trunk line, and based on these determinations, the input selection determiner 15 outputs the trunk line selection signal 7 to the trunk line selection switch 8, and the trunk line selection switch 8 outputs the trunk line selection signal 7. The selected output is monitored by the main control circuit 11, and in case of abnormality, the above two first outputs are activated. The reset signal 1 is sent from the main control circuit 11 to the second control circuit 12.13.
9 and 20 are output for re-judgment.

As shown in the first figure, the device of the present invention has a trunk line selection switching device 8 which switches a normal trunk line among the duplicated first and second trunk lines 2 and 3 by inputting a trunk line selection signal 7. In the device selected by the two first . 2nd relay line 2
, 3 to determine a normal trunk line. The second control circuit 12.13 and the first control circuit 12,13. The judgment outputs 17 , 18 , 17 , 18 of the second control circuit 12.13 are input and the relay line selection signal 7 is transmitted to the relay line selection switch 8
an input selection determiner 15 which monitors the output selected by the trunk line selection switch 8, and outputs the trunk line selection signal 7 from the input selection determiner 15, and the two first and second controls. Judgment output 17 of circuit 12.13, 1B
, 17, and 18, and if an error occurs, enter the first of the two above.
．． Reset signals 19, 2 to the second control circuits 12, 13
This configuration includes a main control circuit 11 that outputs 0 to cause re-judgment.

[For production]

1st. The second trunk lines 2.3 are connected to the first trunk lines 2.3, respectively. Monitored by the second control circuits 12 and 13, if both lines 2.3 are normal, the first. Judgment outputs 17 , 18 , 17 , and 18 are output from the second control circuit 12 13 . These determination outputs 17, 18, 17, and 18 are input to the input selection determiner 15, and the relay line selection signal 7 outputted from this causes the relay line selection switch 8 to select the first or second relay line &? Select I2 or 3.

The selected first or second trunk line 2 or 3 is monitored by the main control circuit 11. This main control circuit 11 has a relay line selection signal 7 and a first . The judgment outputs 17, 18, 17, and 18 of the second control circuits 12 and 13 are turned on, but since all relay lines 2.3 are normal, the main control circuit 11 sends the first. The reset signals 19 and 20 are not output to the second control circuits 12 and 13. Therefore, the first and second control circuits 12 and 13 are never reset.

If the first or second trunk line 2 or 3 is abnormal, the main control circuit 11 A reset signal 19.20 is output to the second control circuits 12 and 13 to control these circuits 12゜1.
3 will be reset and a re-judgment will be made.

If the first or second trunk line 2 or 3 becomes abnormal, the first or second trunk line 2 or 3 becomes abnormal. The judgment outputs 1717 or 18, 18 of the second control circuits 12, 13 are no longer output, and the input selection judgment device 1
Only the judgment outputs 18 1 , 18 or 17 2 , 17 are input to 5 . The input selection determiner 15
Judgment output 18 , 18 or 1 of control circuit 12 , 13
7.degree. I7 is input and the trunk line selection signal 7 outputted from this causes the trunk line selection switch 8 to be operated to select a normal trunk line 3 or 2.

In addition, if the first or second control circuit 12 or 13 is out of order, the input selection determiner 15 is activated by the determination output 17 and 18 of the normal control circuit, and the relay line selection switch 8 is activated.
Accordingly, the first or second trunk line 2 or 3 is selected.

〔Example〕

The present invention will be described in detail below based on the drawings.

FIG. 1 is an explanatory diagram of one embodiment of the method and apparatus of the present invention.

First, its configuration will be explained.

In Figure 1, 1 is a host computer;
Data is sent to either or both of the trunk lines 2.3. Reference numeral 8 denotes a relay line selection switch which switches upon input of the relay line selection signal 7, and selects the first or second relay line 2 or 3 and connects it to the relay output line vA4.

12 and 13 are the 1st. The second relay lines 2 and 3 are connected to the first relay lines 2 and 3. A first and second control circuit that monitors through the second trunk line monitor lines 5 and 6 and determines whether the trunk line 2 or 3 is normal. If the second relay lines 2 and 3 are normal, the first relay line 2 and 3 are normal. Second
Trunk line normality determination outputs 17°18, 17, 18 are output. 15 are these judgment outputs 17°1B, 17
, 18 and outputs a trunk line selection signal 7 to a trunk line selection switch 8.

1st. The second control circuits 12 and 13 are the same circuit, and have the configuration shown in FIG. 2, for example. 12a and 13a are line receiving elements (LSI) of the first trunk line 2, and 12b.

13b is a line receiving element (LSI) of the second relay line 3;
12c and 13c are the receiving elements 12a and 13 for each line.
a, 12b.

a microprocessor 12d which receives the output of 13b as an input;
.

12e, 13d, and 13e are microprocessors 12c and 13c, respectively. 2nd relay episode VA2
, 3 is determined to be normal, and 1
7, 1718, 18 are the first. This is the second trunk line normality determination output (flag content output).

The input selection determiner 15 has a configuration not shown in FIG. 3, for example. 15a is the first. When the judgment outputs 17 and 17 of the first relay line 2 of the second control circuit 12.13 are both judged to be normal, a signal is input to the cent input terminal 15d of the cent reset flip-flop 15c. This is a NAND circuit that sets . 15b is similarly the first. If the judgment outputs 18, 18 of the second relay line 3 of the second control circuit 12.13 are both judged to be normal, a signal is input to the reset input terminal 15e of the flip-flop 15c, and this flip-flop 15c is reset.
It is an AND circuit.

This outputs a signal 7 for selecting the first trunk line 2 when the flip-flop 15c is reset, and for selecting the second trunk line 3 when the flip-flop 15c is reset.

Note that in the case of this circuit, the first. 2nd broadcast &? I 2
.

3 are both determined to be normal, the cent input terminal 15d
The signal 7 for selecting the first trunk line 2 is output from the flip-flop 15c.

11 is the output selected by the trunk line selection switch 8;
That is, the output of the relay output line 4 is monitored, and the relay line selection signal 7 and the first . Judgment output 17 of second control circuit 12.13
, 18 , 17 , and 18 , if there is an abnormality, the first . Reset signals 19 and 20 are output to the second control circuits 12 and 13 to cause them to re-determine.

Next, the operation of the above configuration will be explained.

1st. The second relay lines 2 and 3 are connected to the first relay lines 2 and 3, respectively. The second trunk line monitor lines 5, 6 and the first. Second control circuit 12,1
3 line receiving elements 12a, 12b, 13a
, 13b via microprocessor 12c, 1
3c, and if both lines 2 and 3 are normal, the micro processor sensors 12c and 13c are monitored by the first. Second
The relay line 2.3 is determined to be normal, and the flag 12d is set.
12e, 13d, and 13e, and now the 1st. Second relay line normality determination output 17 , 18 , 17
, 18 are output.

The first trunk line normality determination outputs 17 and 17 are input to the NAND circuit 15a of the input selection determiner 15, and the output thereof is input to the input terminal 15d of the reset flip-flop 15c, and the flip-flop 15c is set to
From this, the trunk line selection signal 7 is output, and the trunk line selection switch 8 selects the first trunk line 2.

Similarly, the second relay line normality determination outputs 18 and 18 are input to the NAND circuit 15b of the input selection determiner 15, and the output thereof is the reset input terminal 1 of the flip-flop 15c.
5e, the flip-flop 15c is reset, from which the trunk line selection signal 7 is output, and the trunk line selection switch 8 selects the second trunk line 3.

That is, when the flip-flop 15c is set, the first
When the trunk line VA2 is also reset, the second trunk line 3 is selected. In the case of this embodiment, the first.
When it is determined that both the second trunk line 2 and 3 are normal, the cent input terminal 15d takes priority, and the trunk line selection signal 7 for selecting the first trunk line 2 is output from the flip-flop 15c, thereby switching the trunk line selection. The device 8 operates to select the normal first relay circuit vA2.

The main control circuit 11 is the first. The judgment outputs 17, 18, 17, 18 of the second control circuit 12.13, the relay line selection signal 7, and the output of the relay output line 4 are monitored, but since both relay lines 2 and 3 are normal, the main control 1st from circuit 11. Reset signal 19°2 to the second control circuits 12 and 13
0 is not output. Therefore, the first. Second control gate 12.
1341 will never be reset.

When the first or second relay line 2 or 3 becomes abnormal and the monitoring result of the main control circuit 11 becomes abnormal, the main control circuit 11 outputs the reset signals 19 and 20 to the first and second control circuits. 12 and 13 will be reset/re-evaluated.

At this time, the main control circuit 11 erroneously monitored the output of the relay output line 4. Even if the reset signals 19.20 are output to the second control circuits 12 and 13, the first control circuits 12 and 13 are output. Judgment outputs 17 , 18 , 17 , 18 of second control circuits 12 , 13
Since all are reset, the flip-flop 15c in the input selection determiner 15 is not changed.
Switching of the trunk line selection switch 8 is not performed.

1st. If either the second control circuit 12 or 13 becomes abnormal, the first control circuit 12 or 13 becomes abnormal. Judgment output 17 of second control circuits 12 and 13
゜17 or 18, 18 is no longer output, and the input selection determiner 15 receives the judgment output 18, 18 or 17,
Only 17 will be input. Input selection determiner 15
are the judgment outputs 18 , 1 of the first and second control circuits 12 , 13
8 or 17.degree. 17, and the trunk line selection signal 7 outputted from this causes the trunk line selection switch 8 to be operated to select a normal trunk line 3 or 2.

If the first or second control circuit 12 or 13 is out of order, the input selection determiner 15 is activated by the determination output 17-8 of the normal control circuit, and the relay line selection switch 8 is activated to select the first or second control circuit. The second relay time yA2 or yA3 will be selected.

In addition, 1. When the second control circuits 12 and 13 are released, the control circuits 12 and 13 monitor the first and second relay circuits yA2.3 again, and send a judgment output corresponding to a normal line. Become.

〔Effect of the invention〕

As described above, according to the present invention, first. Second control circuit 12
, 13 and the main control circuit 11. It is possible to monitor the second relay line 2.3 and the relay output port 'eA4 connected to it, and even if one of the three control circuits becomes abnormal, a normal line can be selected. Not only the first
．． By monitoring the second trunk line 2.3 and all lines after selection switching, a highly reliable circuit can be constructed.

Furthermore, even if any one of the three control circuits 11 to 13 fails or the microprocessor goes out of control, the relay lines 2 and 3 will not be abnormally switched.
This has the advantage that there is no risk of adverse effects on devices connected to the relay output line 4 at a lower level.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of one embodiment of the method and apparatus of the present invention, and FIG.
Figures 1 and 3 respectively represent the first part of the present invention. 4 is an explanatory diagram showing the configuration of the second control circuit and the input selection determiner; FIG. 4 is an explanatory diagram of the first example of the conventional method and apparatus; FIG. 5 is an explanatory diagram of the second example of the conventional method and apparatus; The figure is an explanatory diagram of a third example of the conventional method and apparatus. 2...First relay line, 3...Second relay line, 4...Relay output line, 7...Relay line selection signal, 8... ... Relay port vA selection switch, 11 ... Main control circuit, 12 ... First control circuit, 13 ... Second control circuit, 15 ...
...Input selection judger, 17... (first trunk line normal) judgment output, (8... (second trunk circuit normal) judgment output, 19...・Reset signal, 20
...Reset signal, 21... Data in progress. 5 each 9.4

Claims (2)

[Claims] (1) In a method of selecting a normal trunk line among the duplexed first and second trunk lines 2 and 3 using a trunk line selection switching device 8 that switches upon input of a trunk line selection signal 7, The first and second trunk lines 2 and 3 of the book are connected to the two first and second trunk lines.
The control circuits 12 and 13 monitor and determine which trunk line is normal, and based on these determinations, the input selection determiner 15 outputs the trunk line selection signal 7 to the trunk line selection switch 8, The output selected by the switch 8 is monitored by the main control circuit 11, and in the event of an abnormality, the main control circuit 11 outputs reset signals 19, 20 to the two first and second control circuits 12, 13. A method for selecting a normal trunk line in a duplex trunk line configured to cause re-judgment. (2) In a device that selects a normal trunk line among the duplexed first and second trunk lines 2 and 3 using a trunk line selection switch 8 that switches upon input of a trunk line selection signal 7, Two first and second control circuits 12 and 13 that monitor the first and second relay lines 2 and 3 and determine whether they are normal, and the determination of these first and second control circuits 12 and 13 Output 1
7, 18, 17, and 18 and outputs the trunk line selection signal 7 to the trunk line selection switch 8.
, the relay line selection signal 7 which monitors the output selected by the relay line selection switch 8 and is output from the input selection determiner 15, and the determination output 17 of the two first and second control circuits 12 and 13. , 18, 17, and 18, and in the case of an abnormality, outputs reset signals 19 and 20 to the two first and second control circuits 12 and 13 to cause re-judgment. A device for selecting a normal trunk line in a line.