JPH02140033A - Polling reply system by variable length frame - Google Patents

Abstract

PURPOSE:To collect a data of plural slave stations optionally through one master station data request by allowing each slave station to generate a reply signal with variable length frame constitution adding the information of its own station sequentially to an information field of a reply frame. CONSTITUTION:A data input processing section 1 of a slave station S receives a request in a frame from a master station and decodes an address frame A2 and a command field C. When '1' is described in its own station part, a supervisory data in response to the content of the field C is received by a supervisory data control section 4 and is outputted to a reply data generating section 2. When a reply frame from the post stage station to the master station is sent, a reply data input processing section 5 receives it. When it is normal, the result is sent to a generating section 2 to bring its own station bit of the frame A2 to 1 and the supervisory data of the slave station S is inserted to an information field I additionally, sent to a reply data output processing section 6, which sends a reply frame to the master station side.

Description

[Detailed description of the invention] [Table of contents] Overview Industrial field of application Prior art (Figure 5) Means for solving the problems to be solved by the invention (Figure 1) Working examples (Figure 2) ~Figure 4) Effects of the invention [Summary] Regarding the polling response method using variable length frames, a single response signal is received from a master station for multiple monitored stations in response to a single request signal, and this allows selective monitoring of multiple monitored stations. The purpose of the polling response method is to enable the collection of data from monitoring stations. The plurality of stations include request data input processing means for identifying whether a request from a master station is directed to the own station, monitoring processing means for monitoring the status within the station, and response signals from subsequent stations. It is equipped with a response data input processing means for receiving, and a response data creation means for inserting response data for the master station into a response signal from a subsequent station, and selectively inputs response data from the master station to multiple stations in the same request signal. The station that makes the request is configured to respond to the master station with the same response signal of variable length.

[Industrial application field]

The present invention relates to a polling response system using variable-length frames, and more particularly to one in which polling between a master station and a plurality of slave stations and its response time are shortened to provide immediacy of supervisory control information.

[Conventional technology]

As shown in FIG. 5(A), the conventional monitoring and control system
The master station M sends polling call signals to the control lines of the slave stations S1, S2, . . . , Sn independently. A polling method is used in which the called slave station responds to the call.

In this case, the master station M first issues a monitoring item request to the slave station S1, for example, requesting data transfer of all monitoring items, such as transfer of all items, and the slave station S1 transfers the requested monitoring items to the master station M. do. Next, the master station M sequentially performs the same operation on the slave stations S2 to Sn, and collects data on the monitoring items of each slave station.

That is, the master station M sends each slave station S1 to Sn a
) Polling was performed using formant frames as shown in (). In this frame, as shown in FIG.
It is written in 6 bits of bs, and for a transmission line where a branch exists, the section number indicating that transmission line is written as, for example, bo
, b7. In addition, in section C, the frame type is entered with 6 pins of bo-bs, for example, and the communication flag indicating whether it is an uplink frame or a downlink frame is written, for example, b
It is written with 2 bits o and b7.

Here, the frame type includes, for example, a status change item request that requests a report on only those whose status has changed among multiple monitoring items, a status change item transfer that indicates a transfer report for this request, and a status change item request that requests a report on all monitoring items. There are item requests, transfer reports for all items, and other matters. Further, the communication flag is written as, for example, ro 1J in the case of a downlink frame from the master station to the slave station, and as "10" in the case of an uplink frame from the slave station to the master station. Then, the transfer report items are entered in section I, and the 7th question of the frame is entered in section FC3.

[Problem to be solved by the invention]

In order for the master station M to collect information on the slave stations S1 to Sn using such a conventional method, the polling operation must be performed at least zero times. That is, it was necessary to sequentially update address field A from 1 to n and repeat this process 0 times. Therefore, the more the number of slave stations increases, the more the master station M becomes a slave station S! ~The time required to collect Sn information increases, and this increase in the number of stations may impede the immediacy of information, and even if a serious failure occurs, the master station may not be able to detect it immediately. There was a problem.

Therefore, an object of the present invention is to provide a polling response method that can monitor the status of each slave station in a short time even if the number of slave stations increases, in order to improve such problems.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an address field AI and an address field A2 in the transmission frame from the master station, as shown in FIG. Enter the bit and node indicating whether there is a request for reply data. For example, slave station S1.32-s
n respectively address field A! 1, the 1st bit, the 2nd bit, the nth bit, and the
A slave station whose bit is "1" is requested to respond with the item corresponding to the frame type entered in the command field C, and a response is not required from a slave station whose bit is "0".

Then, the slave stations that should respond send their respective response data,
As shown in FIG. 1(C), the information field I is filled in sequentially and sent back to the master station. That is, as shown in FIG. 1(C),
In address field A2 for slave stations m2 and ms, "
When "1" is sent, the slave station m3 first writes response data Im3 in the information field (3) to create a reply frame.

Then, when this reply frame is transmitted to the slave station m2, the slave station m2 turns on the local bit of its address field A2, writes the response data Im2, and sends the reply frame to the master station. become.

Therefore, as shown in FIG. 1(A), each slave station has a monitoring processing unit 3 that monitors the status of the monitored object and outputs monitoring data.
, a monitoring data management section 4 for managing the monitoring data, and a response data creation section 3.

That is, when the request data input processing section 1 of the slave station S receives a frame from the master station and decodes the address frame A2 and command field C, and when "1" is written in the local station part, Monitoring data corresponding to the contents of the command field C is received from the monitoring data management section 4 and output to the response data creation section 2.

When a response frame to the master station is transmitted from the downstream slave station, the response data input processing section 5 receives it and checks whether it is normal using the frame check sequence FC3, and if it is normal, responds. Sends it to the data creation unit 2, and sets the local bit of the address field A2 to rl.
J, the monitoring data of the slave station S is additionally inserted into the information field I, and transmitted to the response data output processing section 6. In the data output processing section 6, the frame check sequence F
After creating a new C3, a response frame into which the monitoring data of the slave station is inserted is sent to the master station.

In FIG. 1(A), the data input direction control section 7 first turns on the request data input processing section 1 in order to receive the polling signal output from the master station, and then starts the response data input processing. This is to control section 5 to turn on.

[Effect]

The master station can simultaneously request monitoring data from multiple slave stations using a single polling signal, and the selected slave stations can sequentially send each requested monitoring data to the same frame signal. Since additional entries can be made and transmitted to the master station using a variable length frame, the status of each slave station can be collected by a single polling request at the master station.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 2 to 4.

FIG. 2 is a configuration diagram of an embodiment of the present invention, FIG. 3 is a detailed explanatory diagram of the present invention, and FIG. 3(A) is a frame format sent from a master station to a slave station. B) is the frame format sent back from the slave station to the master station, Figure 3 (C
) is an explanatory diagram of address field A1, address field A2, and command field C, and FIG. 4 is an explanatory diagram of frames sent from the master station to the slave station and frames sent back from the slave station to the master station. .

In FIG. 2, the same symbols as in FIG. 1 indicate the same parts.

The monitoring processing unit 3 includes a first monitoring processing unit 3-1, a second monitoring processing unit 3-2, an m-th monitoring processing unit 3-, and the like, which are installed in multiple parts in order to monitor the operating state of the slave station S. It is composed of m.

The monitoring data management unit 4 includes these first monitoring processing units 3-1 to 3-1.
It collectively holds and manages the monitoring data sent out from the m-th monitoring processing section 3-m, and supplies necessary data in response to data requests from the request data input processing section 1.

The transmission frame transmitted from the master station is formed in the format shown in FIG. 3(A). A! , A2 are address fields, and the address field A1 is composed of, for example, 8 pins, as shown in FIG. 3(C).
Bits bo-b5 are reserved areas, and bits b6,
The section number is entered in b7 as in the past. Further, the address field A2 is configured with a size corresponding to the number of slave stations, and as shown in FIG. The presence or absence of a monitoring data response request is shown.If a response request is made to all 32 slave stations, the master station will send all S o w S31 to "1".
”. Command field C is shown in Figure 3 (C
), the frame type and communication flag are comprised, and these are the same as in the conventional example explained with reference to FIG. 5 above.

Next, as shown in FIG. 4, the operation of the present invention is as shown in FIG.
An example of requesting monitoring data from m2 and Sm3 will be explained.

(1) First, the master station M inputs the part m2 indicating the slave stations Sms and 5rrz from which data is to be collected in the address field A2.
, m3 are filled with "1" and the transmission frame shown in frame FO in FIG. 4 is transmitted onto the control line CA. Each of the slave stations Smr, Sm2, Sm3, etc. receives this in their respective request data input processing units 1 shown in FIG. Recognize that a request has been communicated.

(2) The slave station S m 3, which is the last station to which the data collection request was made from station m, first creates a response frame to the master station M. When the request data input processing unit l of the slave station recognizes that a data collection request has been made to the own station, it determines whether or not there is data collection for a downstream station from the own station. Since this endowment subsidiary station Sms is the last station, its request data input processing unit 1 receives monitoring data according to the frame type from the monitoring data management unit 4 and sends it to the response data creation unit 2. The response data creation section 2 turns on the own station bit m3 of the address field A2, writes the requested monitoring data information Irrz in the information field I, and transmits it to the response data output processing section 6. The response data output processing section 6 creates and writes a frame check sequence FC3, that is, check data, and sends the response frame Fl shown in FIG. 4 to the control vACBt.

(3) Since no data collection request has been made to the slave stations existing between all slave stations Sm3 and Sm2, this response frame F! is transmitted through these slave stations. When the frame reaches the slave station Sma, the response data input processing unit 5 of the slave station Sms checks the response frame FL based on its frame check sequence FC3. If this check is normal, the response data creation unit 2 turns on the own station bit m2 of the address field A2, and sets the requested monitoring data information I in the information field ■.
rna is inserted and transmitted to the response data output processing section 6. The response data output processing unit 6 performs a new frame check for frames with increased frame lengths.
The sequence FC3 is created and filled in to create a response frame Ft, which is sent to the control line CB2.

(4) This response frame F! to slave station Smr! When this is transmitted, the own station recognizes that there is no data collection request from the master station, so this response frame F2 is sent to the response data input processing section 5, response data creation section 2, and response data output processing. The signal is passed through the section 6 as it is and sent to the control line CB3.

(5) The master station M can collect the requested monitoring data of each of the slave stations S m 2 and S m 3 at once using the response frame returned in this manner.

(6) In the slave station S m 2, when an error is detected as a result of the response data input processing section 5 checking the transmitted response frame Fr using its frame check sequence FC3, the response data input processing section 5 reports this to the response data creation section 2. Response data creation section 2
As a result, the response frame F from this lower station is now
1, and creates a retransmission request and sends it to master station M. This causes the master station to request data collection again.

Note that the above description describes one embodiment of the present invention, and the present invention is of course not limited to this.

〔Effect of the invention〕

According to the present invention, in response to one data collection request from the master station,
Each designated slave station creates a response signal using a variable length frame structure that sequentially adds its own information to the information field I in the response frame, so that multiple slave stations can receive data from a single data request from the master station. It becomes possible to collect data arbitrarily, and data can be collected in a short period of time, making it possible to adapt to the immediacy of data.

FIG. 4 is an explanatory diagram of a transfer frame of the present invention, and FIG. 5 is an explanatory diagram of a conventional example.

1-・Data input direction control section 2--Request data input processing section 4.--Monitoring data management department 5-Response data input processing section 6.--Response data output processing section 7-・Data input direction control section 31 Monitoring processing unit Patent applicant: Fujitsu Limited Representative Patent Attorney Akira Yamatani

[Brief explanation of the drawing]

FIG. 1 is a detailed explanatory diagram of the present invention; FIG. 2 is a configuration diagram of an embodiment of the present invention. FIG. 3 is a detailed explanatory diagram of the present invention, Figure 2 Kishana B ear principle mouth Figure 1 Figure 3 Figure 5

Claims (1)

[Claims] (1) In a polling response method in which a plurality of stations (S) are monitored by a master station and data requests regarding the plurality of stations are made based on a request signal from the master station, within the plurality of stations (S) to be monitored. , a request data input processing means (1) for identifying whether a request from a master station is addressed to the own station, a monitoring processing means (3) for monitoring the status within the station, and a response from a subsequent station. It is equipped with a response data input processing means (5) for receiving a signal, and a response data creation means (2) for inserting response data for the master station into a response signal from a subsequent station, and for transmitting data from the master station to multiple stations. A polling response method using a variable length frame, characterized in that a request is made selectively in the same request signal, and the station that made the request responds to the parent station with the same response signal of variable length.