JPH0293702A - Duplex transmission device - Google Patents

Abstract

PURPOSE:To attain the speedy transferring of preferential data without waiting for the operation completion of a normal system sub control device and to improve the operation efficiency of a duplex control device by providing a prescribed area in a shared storing means and activating a standby system sub control device. CONSTITUTION:When the preferential data are generated, a main control device 1 sets its data to a preferential transmission and reception buffer 64 of a standby system 2 port memory 5 and sets a transmission request 1 to a preferential transmission requesting flag 62. A preferential reception requesting flag 63 is checked. When there is a reception request 1, the preferential data are read from the buffer 64. Then, when the reading is finished, reception completion 2 is set to the flag 63. On the other hand, in the preferential processing of the sub control device, the flag 62 is checked and when there is the request 1, the preferential data of the buffer 64 are transmitted to an opponent station. Then, when the transmission is completed, transmission completion 2 is set to the flag 62. The presence or absence of the preferential data from the opponent station is checked. When the preferential data are present, these data are received by the buffer 64 and the request 1 is set to the flag 63 and informed of the device 1. Then, the completion of the reading is checked. After that, when the flag 63 goes to the completion 2, the operation is repeated.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention improves data transmission efficiency in a duplex transmission device consisting of a regular system and a standby system control device by transmitting and receiving priority data through the standby system control device. This invention relates to a duplex transmission device.

(Prior Art) FIG. 4 is a block configuration diagram showing the configuration of a conventional duplex transmission device. As shown in the figure, the duplex transmission device consists of two sub-control devices (A) and (B), and one of these two sub-control devices (A) and (B) is activated first during control. However, when a failure occurs, the regular system sub-control device becomes a standby system, and the other is a standby system sub-control device, which changes to the regular system and operates when the regular system sub-control device fails. these,
Mode settings for the regular system and standby system are performed by the main controller.

In the duplex transmission device configured as above, (1
) is a main control device, and the main control device (1) includes a central processing unit (11) and a memory (12) that stores a program for the main control device (1) executed by the central processing unit (11). ing. (2) is a sub-control device A that is controlled by the main control device (1), and the sub-control device A (2) is registered with the central processing unit (21) and the operations processed by the central processing unit (21). ROM (22), and a transmitting/receiving section (23) for transmitting and receiving data.

Note that when the power is turned on to the sub-control device A (2), the RO
M (22) is activated by the central processing unit (21). (3) is a sub-control device B controlled by the main control device, and has the same configuration as the sub-control device A (2).

(4) and (5) are main controller (1) and sub-control device A
, B(2), and (3) as a shared storage device. As shown in the area allocation diagram of FIG. 5, the two-board memories (4) and (5) are the central processing unit (11) of the main control unit (1) and the sub-control units A and B (2).

(3) Send/receive requests to either of the regular systems.

It has a transmission/reception request flag (61) that indicates completion. For example, if the sub-control device A (2) is the regular system, if "1" is set in this area of the 2-boat memory (4), the sub-control device Device A (2) performs transmission and reception processing, and sets "2" when the processing is completed.

The operation of the duplex transmission apparatus configured as described above will be explained with reference to the flowchart shown in FIG. In this text, the regular system will be explained as sub-control device A (2), and the standby system will be explained as sub-control device B (3).

First, the central processing unit (11) of the main control unit (1) writes “ 1
” (Step 101), and then waits for transmission/reception to be completed (Step 102).On the other hand, in the regular system sub-control device A (2), the central processing unit (21)
The program stored in M (22) monitors the transmission/reception request flag in the 2-board memory (4), and if "1°" is set in this area (61) (step 10).
3) Performs transmission/reception processing (step 104), and when the transmission/reception is completed, sets "2" to the transmission/reception request flag (61) of the 2-vote memory (4) (step 105). The main controller confirms that the transmission/reception request flag (61) is set to "2" and repeats the next transmission/reception. on the other hand,
The standby system sub-control device B (3) is the regular system sub-control device A.
(2) remains inactive and on standby until it fails.

[Problem to be solved by the invention]

As described above, in conventional duplex transmission equipment, while the regular sub-control unit is operating, the standby sub-control unit is inactive, so the main sub-control unit cannot be used while the regular sub-control unit is transmitting or receiving a large amount of data. When data to be transmitted preferentially to the control device occurs,
The main controller must wait to transmit priority data until the transmission/reception processing of the currently active sub-controller is completed, resulting in low data transmission efficiency and poor responsiveness to data transmission/reception. There was a point.

This invention was made to solve the above-mentioned problems, and it is an object of the present invention to obtain a duplex transmission device that can transmit and receive priority data generated by a main control device with good responsiveness regardless of the operation of a regular sub-control device. With the goal.

[Means to solve the problem]

In the duplex transmission device according to the present invention, among a plurality of sub-control devices set as a regular system and a standby system by a main control device incorporating a central processing unit, a main control device is set as a sub-control device set as a stand-by system. A function for transmitting and receiving the generated priority data is provided, and a priority data transmission request flag and a priority data reception completion flag are set from the main controller to the secondary controller in the common storage device provided between the secondary controller and the main controller. In addition to providing areas for flags, priority data transmission completion flags, and priority data reception request flags that are set from the sub-control device to the main control device, priority data sent and received between the main control device and external devices through the sub-control device is temporarily stored. A priority data buffer area is provided for storing the data.

[For production]

According to this invention, if priority data is generated in the main control device while the regular sub-control device is operating and transmitting and receiving a large amount of data, the standby control device that is not operating is provided with priority data. The priority data is written to the priority data buffer area of the shared common storage device, the priority data is requested to be sent to the standby system control device via the priority data transmission request flag area, and the priority data is received by the standby system control device. If so, request the main controller to receive priority data via the priority data reception request flag area.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. The overall configuration diagram of the duplex transmission device according to this embodiment is the same as the conventional device shown in FIG. “1” is set when a request is made, and “2” is set when transmission is completed.
The priority transmission request flag (62) is set, and “
A priority reception request flag (63) which is set to "1" and set to "2" when reception is completed, and a priority transmission/reception i buffer (64) for temporarily storing priority data are arranged.

Next, based on the above configuration, the operation of this embodiment will be explained as shown in FIGS. 1 and 2.
This will be explained with reference to the flowchart shown in the figure. In this text, the regular system will be explained as the sub-control device A (2), and the standby system will be explained as the sub-control device B (3). The operation of the regular system sub-control device A(2) is exactly the same as the conventional example shown in FIG. Step 101: The main control device (1) sets a transmission/reception request to the sub-control device A (2) which is the regular system.
), the priority processing (step 200) is performed while waiting for completion (step 102). On the other hand, priority processing (step 300) is performed on the standby sub-control device B(3).

The priority processing will be explained with reference to the flowchart in FIG.

First, the main controller (1) checks whether there is priority data (step 201). If there is, the priority data is transferred to the priority transmission/reception buffer (64) of the standby 2-boat memory (5).
) (step 202). A transmission request of “1” is set in the priority transmission request flag (62) of the standby system 2-boat memory (5).
” (step 203). Priority transmission request flag (6
2) waits for transmission completion to be "2" (step 204).
). Also, check whether priority data has been received from the partner station (whether the priority reception request flag (63) is "1" or not) (step 205). If the reception request is "1", the priority data is stored in the standby 2-board memory. (5) Priority sending/receiving buffer (6
4) Read from (step 206). When the reading is completed, the priority reception request flag (63) of the standby system 2 hold memory (5) is set to “2” (step 2).
07).

On the other hand, in the priority processing of the sub-control device, the priority transmission request flag (62) of the 2-boat memory (5) is set to the transmission request "1".
"Check whether or not" in step 301), send request "
1", the priority data in the priority transmission/reception buffer (64) of the 2-boat memory (5) is transmitted to the other station (step 302). When the transmission is completed, the priority transmission request flag (62
) is set to “2” indicating completion of transmission (step 303),
Also, check whether there is priority data from the other station (step 3o4), and if there is, receive the priority data into the priority transmission/reception buffer (64) (step 305), and notify the main controller (1) that the priority data has been received. ), the priority reception request flag (63) is set to ``1'' (step 306), the main controller (1) checks whether reading is completed, and the priority reception request flag (63) is set to ``1'' (step 306). When it reaches completion “2”, repeat again (step 30)
7).

〔Effect of the invention〕

As described above, according to the present invention, when the conventional regular sub-control device is operating, the standby sub-control device, which has stopped operating, can be activated to send and receive priority data generated by the main control device. Because of this configuration, priority data can be quickly transferred without waiting for the completion of the operation of the regular system sub-control device, and the operating efficiency of the device can be increased.

[Brief explanation of the drawing]

1.2 is a flowchart showing the operation of the embodiment of the present invention, FIG. 3 is an area layout diagram of the two-boat memory of the above embodiment, and FIG. 4 is a block diagram showing the configuration of the duplex transmission device.
FIG. 5 is an area layout diagram of a conventional two-boat memory, and FIG. 6 is a flowchart showing the operation of the conventional example. (1)... Main controller, (2)... Sub-control device A,
(3)...Sub control device B, (4), (5)...2 boat memory, (11)
, (21), (31)...Central processing unit, (2
3) , (33)... Transmission/reception unit, (61)... Transmission/reception request flag, (62)... Priority transmission request flag, (63)... Priority reception request flag, (64)... Priority transmit/receive buffer. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A main control unit with a built-in central processing unit has multiple sub-control units set as a regular system and a standby system, and the control operation is normally performed by the regular system sub-control unit. A secondary control device equipped with a priority data transmission/reception function, and a priority data transmission request flag and a priority data set from the main control device to the secondary control device in a common storage device provided between the secondary control device and the main control device. In addition to providing areas for a data reception completion flag, a priority data transmission completion flag and a priority data reception request flag that are set from the subcontrol device to the main control device, priority information is sent and received between the main control device and external devices through the subcontrol device. A duplex transmission device characterized by providing a priority data buffer area for temporarily storing data.