JPH0589019A - Electronic computer system - Google Patents

Abstract

PURPOSE:To reduce the useless transmission of polling and to reduce residual data received from a slave station by dynamically changing a polling transmission pattern based on polling priority. CONSTITUTION:When no received data exist in an answer from the slave station, a polling priority management table updating means 4 sets the priority of polling to the least significant order. When the received data are existent and no data transmitted from the slave station exist, the priority of polling is reduced, and when the transmitted data are existent, the priority of polling is improved. A polling schedule (PS) updating means 3 prepares the polling transmission pattern based on the polling priority and a PS table 7 is updated. A polling transmission deciding means 2 retrieves the PS transmission pattern, when a PS is not completed, the address of the slave station to transmit polling is decided, and a polling transmitting means 5 is activated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in an electronic computer system for data communication. In particular, it relates to polling transmission control means.

[0002]

2. Description of the Related Art In a conventional example, polling is sequentially transmitted to subordinate stations according to a preset fixed polling list.

[0003]

In such a conventional example, the polling is sent according to a polling list fixedly set at system startup, so that the frequency of occurrence of data of each subordinate station changes from moment to moment. The system has a drawback that wasteful polling is sent or that data is generated on the subordinate station side but there is no polling and transmission data from the subordinate station stays.

The present invention eliminates such drawbacks, and an object of the present invention is to provide an electronic computer system capable of efficiently transmitting polling and receiving data.

[0005]

The present invention provides an electronic computer system comprising a plurality of dependent stations and a control station having polling sending means for sending polling to the dependent stations via a communication device. , The control station judges whether or not received data exists in a response from the dependent station and a polling priority management table in which the polling priority for the dependent station is registered in correspondence with the dependent station address, and the received data When there is no data, the polling priority of the polling priority management table is set to the lowest, when the received data exists, the content of the received data is further judged, and when the transmission data from the dependent station does not exist, Polling priority management table that lowers the polling priority and raises the polling priority when there is transmission data from the dependent station. Update means, response waiting means for activating the polling priority management table update means when the response from the dependent station to the transmitted poll is within a predetermined waiting time, and polling interval of the dependent station corresponding to the dependent station address And a polling schedule updating means for creating a polling sending pattern based on the polling priority table searched for in the polling priority management table, and updating the polling schedule table. In response to the transmission request, the polling transmission pattern in the polling schedule table is searched to determine whether there is any remaining polling schedule. If the polling schedule is not completed, the address of the dependent station that sends the polling is determined. And polling transmission determining means for activating the polling transmission means on the basis of the retrieved polling transmission pattern and activating the polling schedule updating means when the polling schedule is completed. And

[0006]

According to the polling schedule table, the polling is sent to the subordinate station, and the polling priority in the polling priority management table is updated by the response received by the response waiting means. Further, the polling schedule table is updated based on the polling priority management table. As a result, polling is transmitted based on the polling priority of the subordinate station, and useless polling transmission and retention of received data from the subordinate station can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, as shown in FIG. 1, a communication device 1, a polling transmission determining means 2, a polling schedule updating means 3, a polling priority management table updating means 4, a polling transmitting means 5, a response waiting means 6, a polling schedule table. 7 and a polling priority management table 8. Here, referring to FIG. 7, the polling schedule table 7 includes a dependent station side address 71 and a polling transmission pattern 72, and referring to FIG. 8, the polling priority management table 8 includes a dependent station side address 81 and a polling priority level. 82
Composed of.

As shown in FIG. 1, this embodiment comprises a plurality of subordinate stations and a control station equipped with polling transmission means 5 for transmitting polling to the subordinate stations via the communication device 1. The control station determines whether or not the polling priority management table 8 in which the polling priority for the subordinate station is registered in correspondence with the subordinate station address and whether the received data exists in the response from the subordinate station, When there is no received data, the polling priority of the polling priority management table 8 is set to the lowest, when the received data exists, the content of the received data is further judged, and when there is no transmitted data from the dependent station, Polling priority management table updating means 4 which lowers the polling priority and raises the polling priority when the transmission data from the dependent station exists. A response waiting means 6 for activating the polling priority management table updating means 4 when the response from the dependent station to the transmitted poll is within a predetermined waiting time, and a polling interval of the dependent station corresponding to the dependent station address. A polling schedule table 7 in which the polling pattern to be registered is registered, and a polling schedule updating means 3 for creating a polling transmission pattern based on the polling priority retrieved from the polling priority management table 8 and updating the polling schedule table 7; The polling sending pattern of the polling schedule table 7 is searched according to the sending request,
Whether or not there is a remaining polling schedule is determined, and when the polling schedule is not completed, the address of the dependent station that sends the polling is determined, and the polling sending means 5 is based on this searched polling sending pattern.
And polling transmission determining means 2 for activating the polling schedule updating means 3 when the polling schedule is completed.

Next, the operation of this embodiment will be described. First, in the polling transmission determination means 2, when the generation of the polling transmission request is detected in step S21, step S2
2, the polling transmission pattern 72 of the polling schedule table 7 is searched, and it is determined in step S23 whether or not there is a remaining polling schedule. When the polling schedule is completed, the polling schedule updating means 3 is activated in step S24, the polling schedule table 7 is updated, and the process proceeds to step S25. If the polling schedule is not completed, the dependent station address 71 of the dependent station to which polling is to be sent is determined in step S25, and the polling sending means 5 is activated in step S26. The polling schedule updating means 3 inputs the polling priority management table 8 in step S31. In step S32, the dependent station side address 81 is searched, and the polling transmission pattern 72 corresponding to the polling priority of each dependent station is created based on the polling priority 82. The polling priority management table updating means 4 determines whether or not there is received data in the response from the dependent station in step S41. If there is no received data, the polling priority is set to the lowest in step S42,
Control goes to step S46. If the received data exists, the content of the received data is determined in step S43. If there is no transmission data from the subordinate station, step S4
4 and lowers the priority of the subordinate station in step S
Move to 46. If the transmission data from the subordinate station exists, the process proceeds to step S45 to increase the priority of the subordinate station and the process proceeds to step S46. The polling priority 82 is updated in step S46. The polling sending means 5 sends polling to the dependent station via the communication device 1 in step S51. In response waiting means 6, step S61
The response waiting time is set by and the process proceeds to step S62.
The waiting time is determined in step S62, and if it is within the waiting time set in step S61, the process proceeds to step S63. If it is outside the waiting time, the process proceeds to step S64. In step S63, the response from the subordinate station is determined, and if there is a response, the process proceeds to step S64. If there is no response, the process proceeds to step S62. In step S64, the polling priority management table updating means 4 is activated. As a result, the polling control based on the priority of the dependent station is executed.

[0010]

The present invention is as described above. Instead of a fixed fixed polling sending pattern, the polling priority for each dependent station is updated according to the response from the dependent station, and the polling sending pattern is dynamically changed based on the polling priority. It is possible to reduce useless polling transmission and reduce retention of received data from the dependent station.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of polling transmission determining means included in FIG.

FIG. 3 is a flowchart showing the operation of polling schedule updating means included in FIG.

FIG. 4 is a flowchart showing the operation of polling priority management table updating means included in FIG.

5 is a flowchart showing an operation of polling transmission means included in FIG. 1. FIG.

FIG. 6 is a flowchart showing the operation of the response waiting means included in FIG.

7 is a diagram showing the contents of a polling schedule table included in FIG. 1. FIG.

8 is a diagram showing the contents of a polling priority management table included in FIG. 1. FIG.

[Explanation of symbols]

 1 Communication Device 2 Polling Transmission Determining Means 3 Polling Schedule Updating Means 4 Polling Priority Management Table Updating Means 5 Polling Sending Means 6 Response Waiting Means 7 Polling Schedule Tables 8 Polling Priority Management Tables

Claims (1)

[Claims] 1. An electronic computer system comprising a plurality of dependent stations and a control station equipped with polling transmission means for transmitting polling to the dependent stations via a communication device, wherein the control station is a dependent station. The polling priority management table in which the polling priority for the subordinate station is registered corresponding to the address, and it is determined whether or not the received data exists in the response from the subordinate station, and if there is no received data, the above polling priority is given. The polling priority of the degree management table is set to the lowest level, the content of the received data is further judged when the received data exists, and the polling priority is lowered when the transmitted data from the dependent station does not exist. When there is transmission data from the dependent station, the polling priority management table updating means for increasing the polling priority and the transmitting port. Response waiting means for activating the polling priority management table updating means when the response from the dependent station to the ring is within the predetermined waiting time, and the polling pattern that defines the polling interval of the dependent station corresponding to the dependent station address A polling schedule pattern is created based on the polling schedule table registered and the polling priority searched from the polling priority management table, and the polling schedule updating means for updating the polling schedule table, and the polling schedule updating means for responding to the polling sending request The polling send pattern in the polling schedule table is searched to determine if there is any remaining polling schedule, and if the polling schedule has not ended, the address of the dependent station that sends the poll is determined and this search is performed. Start the polling sending means based on the polling delivery pattern, computer system, characterized in that a polling delivery decision means for activating the polling schedule update means when the polling schedule is completed.