JPH01149637A - System for monitoring polling control response - Google Patents

Abstract

PURPOSE:To obtain an instantaneous response result and at the same time, to enable input of the monitoring data of a noncontrolled slave station even in a control response waiting state by obtaining the control response in such a way that a specific slave station to be controlled is appropriately caused to interrupt in the order of polling from a host station to slave stations and the interruption is continued during a previously fixed time. CONSTITUTION:The polling controlling circuit 16 of a host station 11 inputs monitoring data from slave stations 13 by successively polling the slave stations 13 through a polling line 12. When a specific slave station M is controlled from the host station 11, the slave station M to be controlled is designated by a slave station controlling circuit 14 and when the control is completed, a control signal is sent to the polling controlling circuit 16. At the circuit 16, when the polling order reaches the slave station M, the control is executed to the slave station M and the slave station M is inserted into the polling order as shown in the figure. In order to monitor whether or not the control response from the slave station M is transmitted, the polling controlling circuit 16 obtains a monitoring time from a control response time memory 15 and returns the polling order to the original state immediately when the response is obtained and after the monitoring time when the response is not obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a polling control response monitoring method, and particularly to a polling control response monitoring method in which a master station controls a slave station and the master station receives the control response as monitoring data input. Regarding the method.

[Conventional technology]

Conventionally, in this type of polling control response monitoring system, a master station controls a slave station and obtains a control response using the following two methods.

(1) A method in which the control response is monitored by polling only the controlled slave stations without polling the slave stations other than the controlled slave stations.

(2) A method of monitoring control responses through polling that occurs every polling cycle.

[Problem that the invention seeks to solve]

The above-mentioned conventional polling control response monitoring methods (1) (2)
) has the following drawbacks.

In the method (1), only the controlled station is polled, so it is impossible to poll other stations than the slave stations and input monitoring data.

In the method (2), the time required to obtain a control response is that the time corresponding to the maximum polling cycle is added to the actual control response generation time, and the control response cannot be obtained immediately.

[Means for solving problems]

The polling control response monitoring method of the present invention is a system in which a master station that performs polling and two or more slave stations monitor and control slave stations 1 to N in sequence from the master station by polling. control the slave station M of
When monitoring the control response, the slave station M is appropriately interrupted in the polling order for the slave stations from the master station, and continues for a predetermined time to obtain the control response.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, FIG. 2 shows the polling order when the slave station is not controlled, and FIG. 3 shows the polling order when the slave station M is controlled. In FIG. 1, one embodiment of the present invention shows a master station 1 that performs polling.
1 and 2 polled through polling line 12.
A slave station control circuit 14 that specifies and controls a specific slave station 13 in the master station 11, a control response time memory 15 that predetermines the maximum response time for the control, It includes a polling control circuit 16 that can change the polling order for the slave stations 13 based on the output of the station control circuit 14 and the contents of the memory 15.

The polling control circuit 16 of the master station 11 is connected to the polling line 1
As shown in FIG. 2, monitoring data is inputted from the slave station 13 via the slave station 13 by sequential polling as shown in FIG.

When controlling a particular slave station M from the master station 11, the slave station control circuit 14 designates the slave station M to be controlled, and when the slave station M is controlled, a control signal is sent to the polling control circuit 16. When the polling order reaches the slave station M, the polling control circuit 16 controls the slave station M and changes the polling order as shown in FIG.

In order to monitor whether a control response from the slave station M is returned within a certain time, the polling control circuit 16 obtains the monitoring time from the control response time memory 15, and if there is a response, the polling control circuit 16 immediately monitors the response. After the time, the polling order is returned to the second figure.

As described above, the polling control response monitoring system of the present invention is composed of a master station that performs polling and two or more slave stations, and in a system in which slave stations 1 to N are monitored and controlled sequentially from the master station by polling, the master station When controlling a specific slave station M from a parent station and monitoring the response of this control, the specific slave station M is appropriately inserted into the polling order for the slave stations from the master station, continues for a predetermined time, and then controlled. You can get a response.

〔Effect of the invention〕

As explained above, the present invention is a method of obtaining a control response by intensively polling for a response from a controlled slave station while also polling other slave stations, so an immediate response result can be obtained.
Furthermore, it is possible to input monitoring data of uncontrolled slave stations even in the state of waiting for a control response.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing the polling order when not controlling a slave station in this embodiment, and Fig. 3 is a diagram showing a polling order when controlling a slave station M in this embodiment. 2 is a diagram showing the polling order of FIG. 11... Master station, 12... Polling line, 13...
・Slave station 1 to slave station N, 14...Slave station control circuit, 15...
- Control response time memory, 16...Polling control circuit, 17...Slave station number.

Claims (1)

[Claims] In a system that consists of a master station that performs polling and two or more slave stations, and in which the master station monitors and controls slave stations 1 to N by polling, the master station controls a certain slave station M, When monitoring the response of the control, the polling control is characterized in that the slave station M is appropriately interrupted in the polling order of the slave stations from the master station, continues for a predetermined time, and obtains the control response. Response monitoring method.