JP3298558B2 - How to send and receive monitoring control messages - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transmitting and receiving a supervisory control message, and more particularly, to a method for efficiently using a shared bus used for transmitting and receiving a message.

[0002]

2. Description of the Related Art One supervisory control package (package)
Various systems have been proposed for effective use of the shared bus in a system for transmitting and receiving a monitoring control message between a plurality of monitored control packages via a shared bus (transmission path). FIG. 1 is a block diagram showing a system of the present invention. In the figure, reference numeral 1 denotes a supervisory control package, and reference numerals 2-1, 2-2, 2-3,.
, 2-N are the monitored and controlled packages 1, 2,.
, N. Reference numeral 2 is used to indicate any monitored control package. Reference numeral 3 denotes a shared bus.

Each monitored and controlled package 1 (reference numeral 2-
1), 2 (reference numeral 2-2), 3 (reference numeral 2-3),...
The message transmitted from N (reference numeral 2-N) to the supervisory control package 1 generally differs depending on the monitored control package (reference numeral 2). ) Is sent to a plurality of monitored control packages (2)
Message in many cases. Therefore,
A group (group) is assigned to a package group of a plurality of monitored control packages (reference numeral 2) (or one monitored control package (reference numeral 2) in some cases) receiving the same monitoring control message from the monitoring control package 1. Then, the monitoring control package 1 transmits a monitoring control message addressed to the group by using a group address. The use efficiency of the shared bus 3 is improved as compared with the case where a monitoring control message is separately transmitted to each monitored control package (reference numeral 2) belonging to the group.

[0004]

One of the unique points of the system to which the present invention is directed is that the frequency of change in the mounting state of the monitored and controlled package (reference numeral 2) is high. That is, the monitored control package (reference numeral 2) is removed from the shared bus 3, newly mounted on the shared bus 3, the monitored control package (reference numeral 2) stops operating (power is turned off), The suspension of operation is that the operation state is restarted (power supply is connected), which means that the mounting state changes frequently. If it is assumed that the monitored control package (reference numeral 2) that is not operating for some reason is a package that is not mounted, the monitored control package (reference numeral 2) belonging to a certain group is 1
Even though none of them is implemented, a situation occurs in which the supervisory control package 1 sends a supervisory control message to the group, and the shared bus 3 is wasted.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a method of transmitting a supervisory control message capable of avoiding such waste of a shared bus.

[0006]

For this purpose, according to the present invention, a mounting monitoring message is transmitted to each group of the monitored control package (reference numeral 2) with a group address attached thereto, and a response signal to the mounting monitoring message is transmitted. If is not returned, the "no implementation flag" is set for the group, and no monitoring control message is sent to the group for which the "no implementation flag" is set.

That is, one monitoring and control package,
In the method of transmitting and receiving a monitoring control message in which a plurality of monitored control packages monitored and controlled by the monitoring control package transmit a message related to the monitoring control via a common bus, the method of the present invention includes: For any one group of the monitored control package, sending the mounting monitoring message to the common bus by putting the group address of the group, and simultaneously setting the timer of the monitoring control package, each monitored control package A group address table storing a group address of a group to which the monitored control package belongs (one monitored control package can belong to one or a plurality of groups) and a random number generation circuit, and the group address Group address stored in the table When a mounting monitoring message having the same group address as the above is received, a random number generating circuit is activated to generate a random number, and a value indicated by the random number is set to a timer of the monitored control package. The monitored control package sends a response signal to the mounting monitoring message to the common bus when the timer times out, and the monitored control package in which the timer has been set has another time before the timer times out. Resets the timer of the monitored control package when the monitored control package detects a response signal to the mounting monitoring message transmitted to the common bus, and sets when the mounting monitoring message is transmitted in the monitoring control package. Before the timer times out, the implementation monitoring If it does not receive a response signal to sage, and set "no implementation flag" for that group, the period in which the flag is set is configured by including the step of stopping the transmission of any message for that group.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. The monitoring control package 1, the monitored control package (reference numeral 2), and the shared bus 3 have already been described. Further, as described above, all the monitored control packages (reference numeral 2) to which the same monitoring control message is input from the monitoring control package 1 are included in one group.

For example, to explain the example added below in FIG. 1, the monitoring control message indicated as control A is temporarily the monitored control package 1 (reference numeral 2-1) and the monitored control package 2 (reference numeral 2 2) If it is input to the monitored control package 3 (reference numeral 2-3), the monitored control package 1 (reference numeral 2-1), the monitored control package 2 (reference numeral 2-2), and the monitored The control package 3 (reference numeral 2-3) forms the group 1, and the monitoring control message indicated as control B is the monitored control package N-1 (however, the monitored control package N-1 is not shown), the monitored control package N (2-N), the monitored control package N-1 and the monitored control package N (2-N) constitute a group 2, and the controls C and D
Are monitored control packages 4, monitored control packages 5, and monitored control packages 6.
(However, if the monitored control packages 4, 5, and 6 are not shown), these monitored control packages 4, 5, and 6 constitute a group 3, and a monitoring control message indicated as control E is transmitted. Monitored control package 3 (reference numeral 2-
3) to N (reference numeral 2-N), the monitored control packages 3 to N constitute a group 4.

As described above, the groups are classified by the common monitoring control message, so that the number of monitored control packages (reference numeral 2) belonging to one group is one or more, and one monitored control package (Symbol 2) is 1
Or, it belongs to two or more groups.

FIGS. 2 to 5 are block diagrams showing the operation of the system shown in FIG. In the method of the present invention, the operation other than the operation related to the mounting monitoring message is the same as the operation according to the conventionally known method. First, the operation similar to the operation according to the conventionally known method is briefly described with reference to FIG. I do.
In FIG. 2, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In the monitoring control package 1, reference numeral 11 denotes a monitoring control message transmitting / receiving circuit, reference numeral 12 denotes a group address table, reference numeral 13 denotes a timer, and Inside the package (reference numeral 2), reference numeral 21 denotes a supervisory control message transmitting / receiving circuit, reference numeral 22 denotes a group address table,
Reference numeral 23 denotes a random number generation circuit, and reference numeral 24 denotes a timer. The signal M1 on the shared bus 3 is an arbitrary monitoring control message, and M1 in FIG. 2 is a command for the group 4 (see FIG. 1). The two monitored control packages (reference numeral 2) are a monitored control package 3 (reference numeral 2-3) belonging to the group 4 in FIG.
It is assumed that the monitored and controlled package 2 (reference numeral 2-2) does not belong to. The message M1 is transmitted with the group address of group 4.

Since the monitored control package 3 (reference numeral 2-3) belongs to the group 4, its group address table 22 contains the group address of the group 4. Therefore, the monitored control package 3 (reference numeral 2-
When the monitoring control message M1 is received by the monitoring control message transmitting / receiving circuit 21 of 3), it is checked whether or not the group address, which is the destination of the message, exists in the group address table 22.
The message M1 is taken into the package (reference numeral 2-3) (in most cases, a command register (command register)).
ster), also known as buffer memory
(Not shown), and performs the operation according to the command.

On the other hand, since the monitored control package 2 (reference numeral 2-2) does not belong to the group 4, its group address table 22 does not include the group address of the group 4. Therefore, the monitoring control message transmitting / receiving circuit 2 of the monitored control package 2 (reference numeral 2-2)
1 receives the monitoring control message M1, it is checked whether or not the group address, which is the destination of the message, exists in the group address table 22. In this case, since the message M1 does not exist, the message M1 is stored in the package (reference numeral 2-). Ignore this as unrelated to 2). In addition, the method of transmitting and receiving a message other than the mounting monitoring message operates in the same manner as the conventional method, and thus the description is omitted.

FIG. 3 is a block diagram showing operations related to transmission of the mounting monitoring message. In FIG. 3, the same reference numerals as those in FIG. 2 indicate the same parts, and operate in the same manner. FIG. 3 shows a case where the mounting control message M0 is transmitted from the monitoring control package 1 to the group 1 (see FIG. 1). The monitored control packages (symbol 2) belonging to group 1 are packages 1, 2, and 3,
In FIG. 3, the package 3 (reference numeral 2-3) is not mounted, and the monitored and controlled package 1 (reference numeral 2-1),
The case where the monitored control package 2 (reference numeral 2-2) is mounted is shown.

Assume that the mounting monitoring message M0 is sent from the monitoring control package 1 with the group address for the group 1. Monitored control package 1 (reference numeral 2)
-1) and the monitored control package 2 (reference numeral 2-2) also belong to the group 1, and the group address table 22 includes the group address of the group 1, so that the mounting monitoring message M0 is monitored. The control package 1 (reference numeral 2-1) and the monitored control package 2 (reference numeral 2)
-2). Implementation monitoring message M0
On the other hand, the first operation performed by each monitored control package (reference numeral 2) is to activate the random number generation circuit 23 to generate a random number. In the monitored control package 1 (reference numeral 2-1), a random number corresponding to T1 is generated.
In (reference numeral 2-2), it is assumed that a random number corresponding to T2 has been generated.

In the monitored control package 1 (reference numeral 2-1), T1 is set in the timer 24, and in the monitored control package 2 (reference numeral 2-1), T2 is set in the timer 24.
When the set timer times out, the monitored control package sends a response signal M2 to the mounting monitoring message M0 to the monitoring control message transmitting / receiving circuit 21.
To the shared bus 3. In the example shown in FIG. 3, T1 <T
2, the timer 24 of the monitored control package 1 (reference numeral 2-1) first times out, and the monitoring control message transmitting / receiving circuit 21 transmits a response signal M2. The response signal M2 is received by the monitoring control message transmitting / receiving circuit 21 of the monitored control package 2 (reference numeral 2-2). Upon receiving the response signal M2, the monitored control package 2 (reference numeral 2-2) resets the timer 24. Therefore, a response signal to the mounting monitoring message M0 is not transmitted twice from the monitored control package 2 (reference numeral 2-2). When the monitoring control message transmitting / receiving circuit 11 of the monitoring control package 1 receives the response signal M2, it is determined that at least one monitored control package is mounted in the group 1, and the monitoring control message transmitting / receiving circuit 11 transmits the mounting monitoring message to the next group. Move on.

FIG. 4 is a block diagram showing a state when the monitored control package 1 (reference numeral 2-1) and the monitored control package 2 (reference numeral 2-2) are further removed from the state shown in FIG. FIG. That is, group 1 (see FIG. 1)
Shows a state in which no package belonging to is mounted. 4, the same reference numerals as those in FIG. 3 indicate the same parts, and the dotted lines surrounding the monitored control package 1 (reference numeral 2-1) and the monitored control package 2 (reference numeral 2-2) indicate these monitored control packages. (No. 2) is removed from the shared bus 3, indicating that no monitored control package (No. 2) belonging to Group 1 is mounted.

In the state shown in FIG.
Has transmitted an implementation monitoring message M0 addressed to group 1. Simultaneously with this transmission, the monitoring control package 1 sets a predetermined time in the timer 13. No response signal is returned for the mounting monitoring message M0 addressed to group 1. When a response signal to the mounting monitoring message M0 is not received by the monitoring control message transmitting / receiving circuit 11 until the timer 13 times out, the monitoring control package 1 determines that the monitored control package mounted in the group 1 does not exist. Then, the “unmounted flag” is set corresponding to the group address of group 1 in the group address table 12. The transmission of the monitoring control message is completely stopped for the group address for which the "no implementation flag" is set.

FIG. 5 is a block diagram showing processing when the monitored and controlled package 1 (reference numeral 2-1) is mounted from the state shown in FIG. 4. In FIG. 5, the same reference numerals as those in FIGS. Show the part. When the newly installed monitored control package 1 (reference numeral 2-1) is mounted and the initialization is completed, the group to which the monitored control package 1 (reference numeral 2-1) belongs (the monitored control package 1 (reference numeral 2- The group to which 1) belongs is only group 1 in the example of FIG. 1).

This mounting message M3 is received by the monitoring control message transmitting / receiving circuit 11 of the monitoring control package 1, and its group address is compared with the group address in the group address table 12, and received as the group address in the group address table 12. If the “non-mounted flag” is set to the same group address as the group address, the flag is reset.

However, after the monitored control package 1 (reference numeral 2-1) of FIG.
Monitoring message M0 with the destination group address
However, if it is detected that the response signal M2 has been transmitted from another monitored control package (reference numeral 2), the mounting message M3 may not be transmitted. Implementation monitoring message M0
May be periodically performed for each group, or may be transmitted to a destination group each time another monitoring control message is transmitted to any group. The frequency at which the mounting monitoring message M0 should be transmitted is determined by the mounting state change frequency.

Although the present invention has been described with reference to a preferred embodiment, the present invention is not limited to the above-described embodiment. The description of the same operation as that of the related art is omitted, but any conventionally known operation can be executed by the system of the present invention. Further, for convenience of explanation, the names of hardware such as a monitoring control message transmitting / receiving circuit, a group address table, a random number generating circuit, and a timer are used in both the monitoring control package 1 and the monitored control package (reference numeral 2). As described above, most of these functions can be realized by software under the control of a computer in the monitoring control package 1 and the monitored control package (reference numeral 2).

[0023]

As described above, according to the present invention, the transmission of useless messages can be stopped by a simple method, and the shared bus can be used effectively.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a system configuration to which a method of the present invention is applied.

FIG. 2 is a block diagram showing transmission of a monitoring control message addressed to group 4 in the configuration of FIG.

FIG. 3 is a block diagram showing processing for an implementation monitoring message addressed to group 1 in the configuration of FIG. 1;

FIG. 4 is a block diagram showing a process for a mounting monitoring message addressed to a group having no mounting in the configuration of FIG. 1;

FIG. 5 is a block diagram showing transmission of a mounting message from a monitored control package newly mounted in the configuration of FIG. 1;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 monitoring control package 2 monitored control package 11 monitoring control message transmission / reception circuit of monitoring control package 12 monitoring control package group address table 13 timer of monitoring control package 21 monitoring control message transmission / reception circuit of monitored control package 22 monitoring control package Group address table 23 Random number generation circuit of monitored control package 24 Timer of monitored control package

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 12/40 H04L 12/28 H04L 12/44 H04Q 9/00

Claims (5)

(57) [Claims] 1. A supervisory control in which one supervisory control package and a plurality of monitored control packages monitored and controlled by the supervisory control package transmit a message relating to the supervisory control via a common bus (data transmission path). In the method for transmitting and receiving a message, the monitoring control package sends a mounting monitoring message to the common bus by inputting a group address of the group to any one of the monitored control packages, Setting each of the monitored control packages to a group in which the group address of the group to which the monitored control package belongs (one monitored control package can belong to one or more groups) is stored. An address table and a random number generation circuit are provided. When a mounting monitoring message having the same group address as the group address stored in the group address table is received, the random number generating circuit is activated to generate a random number, and the numerical value indicated by the random number is changed to the monitored control value. Setting the timer on the package; transmitting the response signal to the mounting monitoring message to the common bus at the time when the timer of the monitored control package has timed out; Resetting the timer of the monitored control package when another monitored control package detects a response signal to the mounting monitoring message sent to the common bus before the timer times out; The control package sends the mounting monitoring message. If the response signal to the implementation monitoring message is not received before the timer set when the timer expires, the "no implementation flag" for the group is set, and during the period when this flag is set, no Stopping transmission of the message; and transmitting and receiving the monitoring control message. 2. The monitoring control message transmission / reception method according to claim 1, wherein the mounting monitoring message is periodically transmitted to all the groups other than the group in which the “no mounting flag” is set. Sending and receiving a monitoring control message. 3. The monitoring control message transmission / reception method according to claim 1, wherein the mounting monitoring message sends a monitoring control message to an arbitrary group other than a group in which a “no mounting flag” is set. A method for transmitting and receiving a supervisory control message, which is transmitted every time prior to transmission. 4. The monitoring control message transmission / reception method according to claim 1, wherein, when an arbitrary monitored control package is newly mounted, after the initialization of the monitored control package is completed, the monitored control package belongs to the monitored control package. Sending the mounting message of the monitored package to the common bus with all the group addresses attached thereto, wherein the monitoring control package that detects the mounting message transmitted on the common bus includes the mounting message in the mounting message. Inspect group addresses included and flag "No implementation"
Resetting the "non-implemented flag" for the group in which is set. 5. The monitoring control message transmission / reception method according to claim 4, wherein when an arbitrary monitored control package is newly installed,
Monitoring, after completion of the initialization of the monitored control package, when the response signal of the mounting monitoring message for all the group addresses to which the monitored control package belongs is received, the mounting message is not transmitted. How to send and receive control messages.