JPH0126214B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data transmission device connected to multiple transmission lines constituting multiple loops on a data highway, and more specifically, a data transmission system for diagnosing its own transmission/reception circuit and loop-shaped transmission line. Regarding equipment.

Conventionally, in this type of data transmission system, if there is a fatal failure in a looped transmission line or transmission device during system operation, the loop is disconnected or the failed transmission device is disconnected.
There was a drawback that it was not possible to diagnose the transmitting/receiving circuit and loop-shaped transmission line involved in the failure.

In addition, there is a drawback that self-diagnosis of all loop-shaped transmission lines and transmitting/receiving circuits used by a certain transmission device cannot be performed, regardless of system operation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data transmission device that uses a standby or active loop transmission path to diagnose the loop transmission path and its own transmitting/receiving circuit.

In order to achieve the above object, a data transmission device according to the present invention is a data transmission device used in a data transmission system having one or more active loop-shaped transmission paths and one or more standby loop-shaped transmission paths, and includes an interrupt means; Stores a setting means for setting which loop-shaped transmission path to use among the active or standby loop-shaped transmission paths, and a diagnostic program for diagnosing the loop-shaped transmission path and the transmitting/receiving circuit for the loop-shaped transmission path. receives the output from the interrupt means and the output from the setting means, and if the setting means is set to the active system, connects the transmitting/receiving line to the active loop transmission line, and bypasses the standby loop transmission line. and when the standby system is set in the setting means, the transmitting/receiving circuit is controlled so that the transmitting/receiving line is connected to the standby loop transmission line and the active loop transmission line is bypassed, and the content of the diagnostic program is and a processor that performs diagnostic operations according to the instructions.

According to the above configuration, self-diagnosis of the loop-shaped transmission path and the transmitting/receiving circuit of the transmission device can be performed by applying a trigger and starting a diagnostic program built into the transmission device, and the object of the present invention is completely achieved. Ru.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a diagram showing the positioning of a data transmission device according to the present invention, and is a diagram showing an example of the configuration of a data transmission system.

In FIG. 1, 1 to 4 are transmission devices, 11 to 1
Reference numeral 4 indicates an active loop transmission line, and 21 to 24 indicate standby loop transmission lines. Normally, during operation as a system, the loop-shaped transmission lines of the active systems 11 to 14 are used, and the loop-shaped transmission lines of the standby systems 21 to 24 are placed in a bypass state (explained in FIG. 5).

FIG. 2 is a diagram showing an embodiment of the transmission device 1 of FIG. 1. In the figure, 31 is a panel, 32 is a processor, 33 is a storage unit storing a diagnostic program, 34 is a transmitting/receiving circuit that sends and receives data on a data highway, 101 is a data bus between the transmitting/receiving circuit 34 and the processor 32, and 102 is a processor 3
103 is a data line from the panel 31 to the processor 32; 106 is a data line from the processor 32 to the panel 31;
04 is a group of signal lines for giving control commands to the transmitting/receiving circuit 34, and 105 is an interrupt signal line from the panel 31 for activating a diagnostic program built into the storage section 33.

Now, interrupt signal 10 is sent from the switch on panel 31.
5 starts the processor 32.

Processor 32 receives data line 1 from panel 31.
By reading 03, it is determined whether to use the active loop transmission line or the standby loop transmission line, and the memory unit 3
3. Run the built-in diagnostic program.

On the other hand, processor 32 controls transmitter/receiver circuit 34 using control signal 104 and data bus 101 according to the contents of the diagnostic program.

When diagnosing the standby system, the transmitting/receiving circuit 34 uses the control signal 104 from the processor 32 to directly connect the loop-shaped transmission lines 14 and 11 of the active system to bypass, and connect the loop-shaped transmission line 22 of the standby system to the receiving side. , 21 to the transmitting side. After switching,
The processor 32 transfers the test data to the data bus 101.
After the test data is converted from parallel to serial data in the transmitter/receiver circuit 34, it is placed on the loop-shaped transmission line 21. The data that has gone around the loop returns again from the transmission line 22, is converted from serial to parallel data, and is transferred to the data bus 101.
It returns to the processor 32 through. During this time,
The processor 32 checks the timeout and the validity of the received data, and connects the standby loop transmission path and the transmission/reception circuit 34.
The results are displayed on the panel 31 through the data line 106. In addition, when diagnosing the active system, the standby system is bypassed, the active system is enabled for transmission and reception, the loop-shaped transmission line and the transmitting/receiving circuit 34 of the active system are tested, and the data line 10 is tested.
6, the results are displayed on panel 31.

Figure 3 shows the panel 31 and processor 32 in Figure 2.
FIG. 3 is a diagram showing an example of the relationship between 301 is a data switch group, which is a setting means for setting which loop-shaped transmission line is to be used.

302 is an interrupt button (interrupt means) for the processor; 303 is a group of photodiodes.

When the interrupt button 302 is pressed, the processor 32 is interrupted through the interrupt signal 105, and the data switch group 301 on the panel 31 is sent to the processor 32.
is beginning to read, and the data switch group 301
Depending on the value of , the loop-shaped transmission line side of the active system is bypassed and the loop-shaped transmission line side of the standby system is diagnosed as capable of sending and receiving, or the loop-shaped transmission line side of the standby system is bypassed and the loop-shaped transmission line side of the active system is Diagnosis is now possible by allowing transmission and reception on the roadside. When the diagnosis is completed, the processor 32 loads a value corresponding to the diagnosis result on the data line 106 and outputs the light emitting diode 3.
Turn on 03.

FIG. 4 is a diagram showing the relationship between the panel 31 and the processor 32, which is different from FIG. 3. 304 is an interrupt button that specifies the loop-shaped transmission line side of the active system.
11 is the interrupt signal line, 305 is an interrupt button for specifying the standby loop transmission line side, 112 is the interrupt signal line, and 304 and 305 serve as interrupt means and setting means, respectively.

The only difference from FIG. 3 is that there are two interrupt signals to the processor 32 and there is no data switch, but the operation is the same.

FIG. 5 is a diagram showing an embodiment of the transmitting/receiving circuit 34 shown in FIG. line, 5
12 is a receiving line from the relay switch 53, 513
514 indicates a transmission line to the relay switch 52, and 514 indicates a transmission line to the relay switch 53. 521
and 522 indicate a relay line for bypass.

In Figure 5, if you normally use the active system,
Transmission line 14 in operational relay switch 52
and the reception line 511, and the transmission line 11 and the transmission line 513 are respectively connected, and the standby relay switch has the transmission lines 21 and 22 connected to the trunk line 522 (bypass state).

Now, when a self-diagnosis command is received from the signal line group 104 to the standby system, the control circuit 51 switches the transmission line 14 to the trunk line 521 and the transmission line 11 to the trunk line 521 through the control line 515 to put the transmission line 11 into a bypass state, and then the control circuit 51 connects the transmission line 22 to 5 through the control line 516.
12, the transmission line 21 is switched to 514. After changing the transmission path in this way, data is transferred and the transmission path and the transmitting/receiving circuit 34 are tested.

When a self-diagnosis command is received from the signal group 104 to the operating system, the relay switch is switched in the opposite manner to the above. The transmission line referred to here is also considered to be one in which a clock signal is input for timing extraction and data and clock lines are mixed. Therefore, even when the transmission line is an optical fiber cable, it is also included in the present invention.

It is also possible to use other means such as semiconductor elements for the relay switches 52 and 53 shown in FIG.

In the embodiment described above, there is one active system and one standby system, but it does not depart from the scope of the present invention even if there are a plurality of active systems and standby systems.

As explained above, the present invention activates a diagnostic program built into the device by applying a selection trigger for selecting which loop-shaped transmission line to use, either the active loop-shaped transmission line or the standby-system loop-shaped transmission line. This has the effect of allowing self-diagnosis of the loop transmission path and the transmitting/receiving circuit.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a loop-shaped transmission system to which the present invention is applied, FIG. 2 is a block diagram partially showing an embodiment of a data transmission device according to the present invention, and FIG. 3 is a panel showing the panel shown in FIG. 2. FIG. 4 is a diagram showing another embodiment of FIG. 3, and FIG. 5 is a diagram showing an embodiment of the transmitting/receiving circuit of FIG. 2. 1-4...Data transmission device, 11-14, 21
~24...Transmission path, 31...Panel, 32...Processor, 33...Storage unit, 34...Transmission/reception circuit, 101, 102...Data bus, 103,1
06,511-514...Data line, 104,1
05, 111, 112, 515, 516... Control line, 301... Data switch (setting means), 3
02...Push button switch (interrupt means), 304,
305...Push button switch (interrupting means and setting means), 303...Light emitting diode, 51...
Control circuit, 52, 53... Relay switch, 52
1,522...Relay line.

Claims (1)

[Claims] 1. In a data transmission device used in a data transmission system having one or more active loop transmission paths and one or more standby loop transmission paths, an interrupt means;
A setting means for setting which loop-shaped transmission line to use among the active or standby loop-shaped transmission lines, and a diagnostic program for diagnosing the loop-shaped transmission line and the transmitting/receiving circuit for the loop-shaped transmission line. Upon receiving the stored storage unit, the output of the interrupt means, and the output of the setting means, if the setting means is set to the active system, connect the transmitting/receiving line to the active loop transmission line, and connect the standby loop transmission line to the active loop transmission line. If a standby system is set in the setting means, the transmission/reception circuit is controlled so that the transmission/reception line is connected to the standby loop transmission line and the active loop transmission line is bypassed, and the diagnostic program A data transmission device comprising: a processor that performs a diagnostic operation according to the content.