JPH03250948A - Duplicate station - Google Patents

Abstract

PURPOSE:To suppress the increase in the hardware in a duplicate station and to improve the system reliability by providing a common comparison processing section to two sets of communication processing sections and providing a selector to a pre-stage of the comparison processing section. CONSTITUTION:When a bypass command 30a is logical 1 and a command 30b is logical 0, a reception signal 4a converted from an optical signal into an electric signal at a reception section 13 is inputted to a communication processing section 20a and a transmission signal 5a from the communication processing section 20a is inputted to a communication processing section 20b via a bypass switch 1a. Since the level of the bypass command 30b is logical 0, the transmission signal 5b from the communication processing section 20b gives the transmission signal 5a to a transmission section 14, in which the signal is converted into an optical signal and sent. When the bypass command 30a is logical 0 and the command 30b is logical 1, the reception signal 4a from the reception section 13 is inputted as it is to the communication processing section 20b and the transmission signal 5b from the communication processing section 20b is sent to the transmission section 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a redundant station that self-diagnoses a standby station.

[Prior Art] FIG. 2 is a block diagram showing a conventional duplexing station shown in, for example, Japanese Patent Application No. 181103-1983.
13) is a receiving section, (14) is a transmitting section, (la) (l
b) is a bypass switch, (20a) and (20b) are communication processing units, and (4a and 4b) are communication processing units (20
a) Reception signals to (20b), (5a) (5b) are transmission signals from the communication processing units (20a) (20b), respectively, (6a) (6b) are reception signals (4a) (4b), respectively.
) and the transmission signals (5a) (5b), a comparison processing unit (3
0a) (30b) are respectively communication processing units (20a) (2
Bypass command output from 0b) and each bypass switch (], a) (lb) and inverter (7a) (7b)
It is connected to the. (8a) (Elb) are AND gates for taking the output from the comparison processing units (6a) (6b) and the conditions of the bypass commands (30a) (30b), respectively, and the pressures are determined by the self-diagnosis results. Judgment output (9
a) (9b).

Next, the operation will be explained.

The operations of the bypass switches (1a) and (lb) are switched to two connection states under the control of bypass commands (30a) and (30b).

When the bypass command is "1", the connection is as shown in (1a), and when it is "0", the connection is as shown in (lb).

The received signal (4a) converted from an optical signal to an electrical signal in the receiving section (13) is manually inputted to the communication processing section (20a),
The transmission signal (5a) from the communication processing unit (20a) passes through the bypass switch (1a) and is sent to the communication processing unit (2, Ob
). Since the bypass command (30b) of the transmission signal (5b) from the communication processing unit (20b) is “0”, the transmission signal (5a) is passed to the transmission unit (14), converted into an optical signal, and sent. be pressured.

In the above explanation, the bypass command (30a) is "1" (30
b) is “0”, but the bypass command (30a
) is "0" (30b) is "1", conversely, the received signal (4a) from the receiving section (13) is input to the communication processing section (20b) as it is, and is also input from the communication processing section (20b). The transmission signal (5b) will be passed to the transmitter (14).

Furthermore, received signals (4a) (4b) and transmitted signals (5a)
) (5b) are passed to comparison processing units (6a) and (6b), respectively.

When the bypass command (30a) is "1", the communication processing unit (20a) is in the operating system, and the data of its own system is also transmitted as the transmission signal (
5a), the received signal (4a) and the transmitted signal (5a)
a) does not match.

When the bypass command (30b) is “0”, the communication processing unit (20b) is a standby system, and the communication processing unit (20b) is
The received signal (4b) is transmitted in the same signal form as the transmitted signal (5).
Output as b).

Therefore, the received signal (4b) and the transmitted signal (5b) regarding the standby communication processing unit (20b) match.

Note that since a time delay occurs when the received signal (4b) passes through the communication processing section (20b), the comparison processing section (6b) adds processing to correct this time delay.

The comparison processing unit (6b) compares the received signal (4b) and the transmitted signal (
After performing the comparison process of 5b), the result is passed to the AND gate (8b). In the AND gate (8b), the bypass command (30b) is "0" in the standby system, and the gate is opened by the signal inverted by the inverter (7b) (
becomes significant) direction.

Therefore, the judgment output (9b) is left to the result of the comparison processing unit (6b). If an abnormality has occurred in the processing unit), this indicates a significant state.

On the other hand, the operation comparison processing unit (6a) receives the received signal (4a)
The transmission signal (5a) is in a mismatched state and is normal, and the processing result of the comparison processing unit (6a) is directly output as a judgment (9a)
Since it is a malfunction to output as
In a), the output from the AND gate (8a) is suppressed to the involuntary side.

Comparison processing unit (6a) (8b), inverter (7a)
(7b), AND gates (8a) (8b), and judgment outputs (9a) (9b) The above explanation shows the case where the bypass command (30a) is "1" (30b) is "0", Bypass command (30a) is “O” (30b)
When is "1", the relationship between the operating system and the standby system is simply reversed.

Therefore, the comparison processing section (6b), the inverter (7b), and the
The ND gate (8b) performs operation-related movements, and the comparison processing section (
6a), the inverter (7a), and the AND gate (8a) needless to say operate as standby systems.

[Problems to be Solved by the Invention] Since the conventional duplex station is configured as described above, even if there are two communication processing units, it is necessary to provide a comparison processing unit in each communication processing unit. However, there was a problem in that the amount of hardware increased.

This invention was made to solve the above-mentioned problems, and when the number of communication processing units is two, the purpose is to reduce the amount of hardware and improve the reliability of the system. .

[Means for Solving the Problems] A duplexing station according to the present invention is such that a common comparison processing section is provided in two communication processing sections, and a selector is provided at a stage before this comparison processing section.

[Function] The selector in this invention functions to pass the received signal and the transmitted signal of the standby communication processing section to the comparison processing section.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, (13) is a receiving section, (14) is a transmitting section, (la) (lb) is a bypass switch, (20a)
(20b) is a communication processing unit, (4a) and (4b) are reception signals to the communication processing units (20a) and (20b), respectively.
a) (5b) are respectively communication processing units (20a) (20b)
(15) is a selector, (6) is a comparison processing unit that receives the output signal from the selector (15), (9)
are the judgment outputs of the self-diagnosis results pressed by the comparison processing unit (6), and (30a) <30b) are the judgment outputs of the communication processing unit (20).
a) Bypass command from (20b) and each bypass switch (la) (lb) and inverter (7a) (
7b), and the output of the inverter (7a) (7b) becomes the input signal designation of the selector (15).

Next, the operation will be explained.

The operations of the bypass switches (la) and (1b) are switched to two connection states under the control of bypass commands (30a) and (30b). When the bypass command is “1”, the connection is like (la), and when it is “0”, it is (ib).
). The received signal (4a) converted from an optical signal to an electrical signal in the receiving section (13) is manually inputted to the communication processing section (20a), and the transmission signal (5a) from the communication processing section (20a) is sent to the bypass switch ( 1a) and is input to the communication processing unit (20b). Communication processing unit (2
The transmission signal (5b) from 0b) is the bypass command (30b
) is “0”, the transmitter (14) receives the transmission signal (
5a), which is converted into an optical signal and sent out.

In the above explanation, the bypass command (30a) is "1" (30
b) is “0”, but the bypass command (30a
) is 0" (30b) is 1", conversely, if the receiving part (
The received signal (4a) from 13) is directly sent to the communication processing unit (
20b), and a transmission signal (5b) from the communication processing section (20b) is passed to the transmission section (14).

The operation up to this point is the same as in the conventional embodiment.

Next, the received signal (4a) is input to the I input of the selector (15), the received signal (4b) is input to the IB large input of the selector (15), and the received signal (5a) is input to the input input of the selector (15). The received signals (5b) are passed to the 2B inputs of the selector (15), respectively.

When the bypass command (30a) is "1", the communication processing unit (20a) is in the operating system, and the data of its own system is also transmitted by the transmission signal (
5a), the received signal (4a) and the transmitted signal (5a)
a) is normal in a mismatched state, and the SA input terminal of the selector (15) is set to "L" level, and the output (IY terminal and 2Y terminal
The received signal (4a) and the transmitted signal (5a) are suppressed from appearing on the terminal).

When the bypass command (30b) is “0”, the communication processing unit (20b) is a standby system, and the communication processing unit (20b) is
The received signal is regenerated and relayed in its original form, and the transmitted signal (
5b).

Since the SB terminal of the 1st node (15) is set to "H" level, the output (IY terminal and 2Y terminal) receives the received signal (4b).
A transmission signal (5b) appears and is passed to the comparison processing section (6).

Note that since a time delay occurs when the received signal (4b) passes through the communication processing section (20b), the comparison processing section (6) adds processing to correct this time delay.

The comparison processing unit (6) compares the received signal (4b) and the transmitted signal (5b).
), and the judgment output (9) indicates an unconscious state if there is a match (the standby communication processing unit is normal), and a significant state if the monarchy (an abnormality has occurred in the standby communication processing unit). will represent.

In the above explanation, the bypass command (30a) is "1" (30
b) or “0”, the bypass command (30a
) is "0" (30b) is "1", the relationship between the operating system and the standby system is simply reversed.

Therefore, the S input terminal of the selector (15) is at "H" level,
The SB terminal becomes “L” level, and the output (IY terminal and 2Y
The reception signal (20a) of the standby communication processing unit (20a) is connected to the terminal (terminal).
4a) and the transmission signal (5a) appear, and the reception signal (4b) and transmission signal (5b) of the operation system communication processing section (20b) do not appear and are suppressed.

[Sound of the invention≠] Impressions As described above, according to the present invention, the two communication processing units are provided with a common comparison processing unit, and the selector is provided in the preceding stage of this comparison processing unit. This has the effect of suppressing an increase in the amount of hardware in the duplex station and improving system reliability.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a duplexing station according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional duplexing station. In the figure, (15) is a selector, (6) is a comparison processing unit, (9) is a judgment output, (4a) and (4b) are received signals,
(5a) and (5b) are transmission signals. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] In a redundant station that uses duplex communication processing units, the two communication processing units are commonly provided with comparison means for comparing the received signal and the transmitted signal, and a selector is provided upstream of the comparison means, so that the communication A means for selecting one of the processing units as an active system and the other as a standby system is provided, and the communication processing unit set as the active system receives a received signal from the outside, performs predetermined processing, and sends it to the outside as a transmission signal. The communication processing unit in the standby system receives a received signal from the outside or an output signal from the communication processing unit in the active system as a reception signal,
This received signal is output as a transmitted signal without any processing, and the received signal and transmitted signal of the standby communication processing unit are passed through the selector, and the received signal and the transmitted signal of the standby communication processing unit are compared as described above. A duplex station is characterized in that it self-diagnoses that it is normal if the two signals are the same when compared by means.