JP4153846B2 - Cyclic message transfer method and relay slave station - Google Patents

Description

  The present invention relates to a cyclic message transfer technique in a data collection system that collects data from measurement points scattered over a wide range by multi-stage relay using short-range communication means.

  As one form of a multi-stage relay data collection system that collects data from a plurality of measurement points scattered over a wide range by multi-stage relay using short-range communication means such as low-power radio, a routing station and a plurality of relay elements The system may consist of stations.

  In this system, the routing station forwards the command message including the routing to the relay slave station, and if the relay slave station is a measurement point, it collects data and adds the collected data to the command message, It is sequentially transferred to other relay slave stations according to the route designation.

  Then, data collection is performed when a command message that circulates the relay slave station finally returns to the routing station.

  As shown in FIG. 5, as a cyclic route in the multistage relay data collection system, relay slave stations 1 to 11 including a routing station C and a plurality of measurement points 2, 3, 6, and 9 (indicated by double frames) It is easy to imagine a circular route C → 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 9 → 10 → 11 → C, but such a form of a circular route is rare. is there.

  For example, in FIG. 5, if the relay slave station 4 and the relay slave station 6 can communicate with each other, the relay slave station 5 is unnecessary. If the relay slave station 3 and the relay slave station 9 can communicate with each other, the relay slave station 5 is not necessary. Stations 7, 8, 10, and 11 are also unnecessary.

  Therefore, under the above conditions, as shown in FIG. 6, it may be a cyclic route of C → 1 → 2 → 3 → 9 → 3 → 4 → 6 → 4 → 3 → 2 → 1 → C. Such a path configuration is generally performed from the viewpoint of economically constructing a multistage relay data collection system by reducing the number of relay slave stations (see, for example, Patent Document 1).

  Referring to FIG. 6 as an example, the routing station C collects data from each measurement point (relay slave stations 2, 3, 6, 9) and the cyclic route C → 1 → 2 → 3 → 9. → 3 → 4 → 6 → 4 → 3 → 2 → 1 → C is transferred to relay slave station 1, and relay slave station 1 is not a measurement point. The command message is transferred to the relay slave station 2 according to the specified information.

  The relay slave station 2 collects data because the local slave station is a measurement point, adds the data to the command message, and transfers the data to the relay slave station 3 on the next route.

  In this manner, the command message is sequentially transferred according to the designated route, returned by the relay slave station 9 and the relay slave station 6, and finally returned to the route designation station C.

  Thereby, the collected data of each measurement point added to the command message is collected in the routing station C. It should be noted that the relay slave station 2 and the relay slave station 3 of the cyclic route C → 1 → 2 → 3 → 9 → 3 → 4 → 6 → 4 → 3 → 2 → 1 → C execute data collection on the forward route of the cyclic message. However, since the relay slave station 2 and the relay slave station 3 have already performed data collection in the forward path, data collection is not performed in the return path of the cyclic path.

  If you build a data collection system by connecting relay slave stations with short-range communication means in multiple stages and relaying messages, as you can see from the fact that high-cost remote communication means was not adopted, how The key is whether the system can be built at low cost.

  As one of the measures, it is conceivable to reduce the relative cost by collecting a plurality of different data in the same multistage relay data collection system.

  For example, it is conceivable to collect data such as a meter reading value of a watt-hour meter, a current voltage value of a pole transformer, and a distribution line ground fault current in the same multistage relay data collection system.

  In order to execute a plurality of data collections with different data collection intervals and data collection times in a single multi-stage relay data collection system, a plurality of different cyclic routes are set and the cyclic routes are set on the respective cyclic routes. The situation where a message exists simultaneously must be considered.

  For example, in FIG. 6, if the relay slave station 3 has a cyclic message A that circulates on the first cyclic route, and the relay slave station 4 has a cyclic message B that circulates on the second cyclic route, For example, at the same time, a situation occurs in which the message A is transferred from the relay slave station 3 to the relay slave station 4, and the message B is transmitted from the relay slave station 4 to the relay slave station 3. Collision may occur.

  If the cyclic route is in a loop form as shown in FIG. 5, this collision state does not occur. However, if the cyclic route is in a general form as shown in FIG. 6, a plurality of cyclic telegrams exist simultaneously on the cyclic route. Sometimes collisions are unavoidable.

  Of course, if each relay slave station is configured to have data storage means (memory) of a size that can store at least two cyclic messages, it is possible to easily determine the collision state by giving priority to either transfer. It can be avoided.

However, in the method of transferring a cyclic telegram in which data is added for each relay slave station at the measurement point, the capacity of the data storage means of the relay slave station must be increased originally. In such a data collection system, If the data storage means is enlarged in order to avoid the occurrence of a collision in a plurality of different data collections by the above-described method, there is a problem that the burden of the data storage means increases and the system cannot be configured at low cost. .
Japanese Patent Laid-Open No. 09-261151 FIG.

  In view of the above problems, the present invention provides a data collection system that collects data by connecting relay slave stations having short-distance communication means in multiple stages, and has a limited capacity data storage means (cyclic message storage means). It is an object of the present invention to provide a method capable of exchanging cyclic telegrams in response to the occurrence of a data transfer collision using a slave station and a relay slave station capable of executing this method.

  In order to solve the above problems, the present invention provides a routing station having a cyclic message creation function and a communication function, a cyclic message storage means for storing the cyclic message, a relay slave station having a data collection function and a cyclic message relay function. In the cyclic message transfer method of the multistage relay data collection system, which is sequentially connected in multiple stages, the routing station creates and sends a cyclic message including a data collection command for collecting data from the routing and relay slave stations, and the relay slave station Relays a cyclic message to which data collected based on the data collection command included in the cyclic message is added based on the route specification, and the cyclic message is transferred between the two relay slave stations. The relay message is subdivided and transmitted from the relay slave station with the smaller free space size of the message storage means to the relay slave station with the larger free space size of the cyclic message storage means, By sending a mutually cyclic telegram from the larger free area size of the sewing replacement, it made it possible to be transferred between the relay slave stations facing the plurality of cyclic telegram.

  That is, the present invention relates to a routing station having a cyclic message creation function including a data collection command and routing and a communication function for communicating with a relay slave unit, a cyclic message storage means for storing a cyclic message, and data collection. Travel in a multi-stage relay data collection system in which a data collection function that collects data based on commands and a relay slave station that has a cyclic message relay function that forwards received cyclic messages based on cyclic routing are sequentially connected in multiple stages In the message transfer method, the routing station creates and sends a cyclic message including a data collection command for collecting data from the routing and relay slave station, and the relay slave station collects based on the data collection command included in the cyclic message The cyclic message with the added data is relayed based on the route specification, and when the two relay slave stations mutually become the transfer destination of the cyclic message, The relay message is subdivided and transmitted from the relay slave station with the smaller free area size of the storage means to the relay slave station with the larger free area size of the cyclic message storage means, and the free area size with the smaller free area size is sent. Sending and exchanging cyclic messages in order after increasing the size.

Further, according to the present invention, the relay slave stations constituting the multistage relay data collection system to which the above cyclic message transfer method is applied are provided with the following means (a) to (g), and the free area of the cyclic message storage means is large: The cyclic message for the maximum available capacity is divided and transferred to the relay slave station, and the cyclic message that has been transferred from the relay slave station that has the largest free area in the free area of the cyclic message storage means generated as a result of this transfer. And the remainder of the segmented cyclic message is transferred to the relay slave station that has the largest free space.
(A) Short-distance communication means for sending and receiving cyclic messages, etc.
(A) a cyclic message relay means for analyzing the received cyclic message and judging whether or not a data collection command for itself is included and a cyclic route;
(C) cyclic message storage means for storing cyclic messages to be transmitted and received,
(D) Data collection / addition means for collecting data based on the data collection command and adding it to the circulating message;
(E) a cyclic message creation means for creating a cyclic message transfer request by adding the capacity of the cyclic message to which the collected data is added to the cyclic message;
(F) Capacity comparison means for comparing the capacity of the cyclic message for which a transfer request was made at the time of receiving the cyclic message transfer request and the free capacity of its own cyclic message storage means obtained from the capacity of the cyclic message held by itself.
(G) a transfer rejection creation means for creating a transfer rejection including the free capacity of its own cyclic message storage means when the capacity of the cyclic message requested to be transferred is larger than the free capacity of its own cyclic message storage means;
(G) a fragmented transfer request means for creating a fragmented transfer request for requesting that a cyclic message be subdivided and transmitted to a size corresponding to the free capacity of its own circulating message storage means when receiving a transfer rejection;
(G) Cyclic message subdivision means for subdividing its own cyclic message into a requested size when a subdivision transfer request is received.

In a multi-stage relay data collection system, each relay slave station constituting the system has a cyclic message storage means necessary for single data collection, so that a plurality of data collection can be executed, and the relative cost of the system Can be reduced.
The present invention uses a relay slave station having only one cyclic message storage area composed of data to be added by a relay slave station, and each relay slave station becomes a cyclic message transfer destination and enters a collision state. A plurality of cyclic messages can be transferred by subdividing the cyclic messages into the larger size of the free area of the cyclic message storage means, and alternately transmitting and exchanging them.

  A configuration of a multistage relay data collection system to which the cyclic message transfer method according to the present invention is applied will be described with reference to FIG. As shown in FIG. 1, in the present invention, the multi-stage relay data collection system includes a routing station 3, a first relay slave station 1-1, a second relay slave station 1-2, and a third relay slave station. 1-3, the fourth relay slave station 1-4, the sixth relay slave station 1-6, and the ninth relay slave station 1-9 are arranged as illustrated. Each of the relay slave stations 1-1 to 1-6 is arranged so as to be able to make a call by short-range communication with the adjacent relay slave station.

  In this multistage relay data collection system, when two data collection is performed, the routing station 3 indicated by the solid line → the relay slave station 1-1 → the relay slave station 1-2 → the relay slave station 1-3 → the relay slave Station 1-6 → Relay slave station 1-3 → Relay slave station 1-4 → Relay slave station 1-5 → Relay slave station 1-4 → Relay slave station 1-3 → Relay slave station 1-2 → Relay slave station 1-1 → Circuit message B is circulated on the cyclic route of the routing station 3, and the routing station 3 indicated by the broken line → relay slave station 1-1 → relay slave station 1-2 → relay slave station 1-3 → Relay slave station 1-4 → Relay slave station 1-5 → Relay slave station 1-4 → Relay slave station 1-3 → Relay slave station 1-2 → Relay slave station 1-1 → On the route of the routing station 3 The circulating telegram A is circulated at a time.

  In the cyclic message A, the measurement points are the relay slave station 1-1 and the relay slave station 1-4, and for example, collect data on pole transformer current voltage values. In the cyclic message B, the measurement points are the relay slave station 1-2, the relay slave station 1-3, the relay slave station 1-5, and the relay slave station 1-6. For example, the data collection of the watt-hour meter reading value is performed. .

  If the relay slave station 1-3 has the cyclic message A and the relay slave station 1-4 has the cyclic message B, for example, the message A is transferred from the relay slave station 1-3 to the relay slave station at the same time. There is a possibility that a situation occurs in which the message B is transmitted from the relay slave station 1-4 to the relay slave station 1-3 and the data B is transferred to the data transfer destination.

  The present invention relates to a cyclic message of a multistage relay data collection system comprising a routing station 3 having a cyclic message creation function and a communication function, and a relay slave station 1 having a cyclic message storage means, a data collection function, and a cyclic message relay function. In the transfer method, in each of the two relay slave stations (for example, 1-3 and 1-4) in which the cyclic message transfer process is in a collision state, all the cyclic message storage means are not used. Paying attention, subdivide the cyclic message to the free size of the cyclic message storage means of the relay slave station with the larger free area of the cyclic message storage configuration between the colliding relay slave stations, and send and exchange the cyclic messages alternately Thus, a plurality of cyclic messages are transferred using a relay slave station having only one cyclic message storage means.

  The configuration of the relay slave station to which the cyclic message transfer system of the present invention is applied will be described with reference to FIG. The relay slave station 1 constituting the multistage relay data collection system to which the cyclic message transfer method according to the present invention is applied includes a short-range communication means 11, a cyclic message relay means 12, a cyclic message storage means 13, and a data collection addition A means 14, a cyclic message creation means 15, a capacity comparison means 16, a transfer rejection creation means 17, a fragmented transfer request means 18, and a cyclic message fragmentation means 19 are configured.

  The short-range communication means 11 is a communication means using, for example, a PHS transceiver function, and a function for establishing a speech path by transmitting and receiving a transfer request between opposing relay slave stations or a routing station, and In addition, it has a function of transmitting and receiving a traveling telegram and the like through an established communication path.

  The cyclic message relay unit 12 is a unit for analyzing the received cyclic message, and has a function of judging a cyclic route and a function of transferring this data collection command to the data collection addition unit when a data collection command for itself is included. The function of transferring the received cyclic message to the cyclic message storage means and the function of transferring the cyclic message from the cyclic message storage means or the subdivided cyclic message from the cyclic message subdivision means to the short-range communication means. Further, the cyclic message relay unit 12 has a function of relaying the received cyclic message as it is when it is relayed to the next cyclic route.

  The cyclic message storage means 13 is a means for storing a cyclic message to be transmitted and received, and has a capacity capable of reliably storing one cyclic message, for example, a capacity of 512 kilobytes.

  The data collection / addition unit 14 is a unit that collects data based on a data collection command and adds the data to a traveling telegram.

  The cyclic message creation means 15 adds the capacity of the cyclic message to which the collected data is added to the cyclic message and creates a cyclic message transfer request.

  The capacity comparison means 16 is a means for comparing the capacity of the cyclic message for which the transfer request has been made and the free capacity of its own cyclic message storage means obtained from the capacity of the cyclic message held by itself when receiving the cyclic message transfer request. If the capacity of the cyclic message requested for transfer is less than or equal to its own free capacity, a transfer request acceptance is transmitted to the remote relay station, and if the capacity of the cyclic message requested for transfer is equal to or greater than its own free capacity It has a function of sending a transfer rejection command to the transfer rejection creating means 17.

  The transfer rejection creation means 17 is a means for receiving a transfer rejection command and sending a transfer rejection including the free capacity of its own cyclic message storage means to the creation short distance communication means 11.

  Subdivision transfer request means 18, subdivision transfer request for requesting to subdivide and transmit a cyclic message to a size corresponding to the free capacity of its own cyclic message storage means when a transfer rejection is received from the opposite relay slave station Is a means of creating.

  The cyclic message segmentation means 19 is a means for creating a segmented cyclic message by taking out a cyclic message of a designated size from the cyclic message storage means when receiving a segmentation transfer request from the opposite relay slave station. .

  A cyclic message transfer method according to the present invention will be described with reference to FIGS. Here, in FIG. 1, for example, a cyclic telegram A for collecting meter readings having a cyclic route indicated by a broken line and measuring points being relay slave stations 1-1 and 1-4, and a solid line. A cyclic telegram B for collecting current-voltage values on pole transformers having a cyclic path and measuring points being relay slave stations 1-2, 1-3, 1-5, and 1-6 is a data collection system in the same time zone. The cyclic message transfer method will be described on the assumption that it exists above.

  Here, the relay slave station 1-3 requests the relay slave station 1-4 to transfer the cyclic message A, and at this time, the relay slave station 1-4 requests the relay slave station 1-3 to transfer the cyclic message B. Suppose you are in a state. In this state, the relay slave station 1-3 and the relay slave station 1-4 are the destinations of the cyclic message (data), and the sum of the sizes of the cyclic message A and the cyclic message B is the cyclic value of each relay slave station. When the size of the message storage means is exceeded, a data transfer collision state occurs in which the cyclic message cannot be transferred normally.

  The relay slave station 1-3 and the relay slave station 1-4 both have 512 kbytes of cyclic message storage means. In this embodiment, as shown in FIG. 4 (A), the relay slave station 1-3 holds a 220 kbytes cyclic message A of the pole transformer current voltage value collection, and the relay slave station 1-4 It is assumed that a 480-kbyte cyclic message B for collecting meter reading values is held.

  As shown in FIG. 3, the relay slave station 1-3 is linked to the relay slave station 1-4 and sends a transfer request for the cyclic message A (including that the transfer capacity is 220 kbytes) to the relay slave station 1. -4 (step S1).

  The relay slave station 1-4 determines whether or not the free area of its own cyclic message storage means can respond to the transfer request based on the size of the transfer capacity in the transfer request (step S2), and the transfer destination is relayed. Since it holds the cyclic message B (480 kbytes) that is the slave station 1-3, it informs that the transfer destination is the relay slave station 1-3 and holds the cyclic message of 480 kbytes, and transfers it. Is rejected (step S3). When it is acceptable, normal transfer processing is executed.

  The relay slave station 1-3 that has received the transfer refusal recognizes that there is a collision with the relay slave station 1-4, and sends a cyclic message B up to 292k from the relay slave station 1-4 with a small free area. A subdivision transfer is requested to the relay slave station 1-3 so as to be divided and transferred into byte data (step S4).

  The relay slave station 1-4 accepts the subdivision transfer request and returns a response (step S5), and then extracts 292 kbytes of the cyclic message B from the cyclic message storage means from the top and executes the subdivision process (step S5). S6), it transfers to the relay slave station 1-3 as a segmented cyclic telegram B-1 (step S7: FIG. 4B).

  The relay slave station 1-3 that has received the segmented cyclic message B-1 (292 kbytes) stores the segmented cyclic message B-1 from the beginning of the free area of the cyclic message storage means (step S8), and also receives a reception response. It returns to the relay slave station 1-4 (step S9).

  The relay slave station 1-4 moves the remaining data of the cyclic message B (188 kbytes) to the front in the cyclic message storage means (FIG. 4C), and creates a 324 kbyte free area (step S10). : (D) of FIG. 4), transfer request acceptance is transmitted to the relay slave station 1-3 (step S11).

  The relay slave station 1-3 that has received the transfer request acceptance transmits a 220 kbyte cyclic message A to the relay slave station 1-4 (step S12: FIG. 4E).

  The relay slave station 1-4 that has received the cyclic message A stores the message from the beginning of the free area of the cyclic message storage means (step S13: FIG. 4F), and also receives a reception response to the relay slave station 1-3. It returns (step S14).

  The relay slave station 1-4 moves the stored data (292 kbytes) of the cyclic message B-1 stored in the cyclic message storage means to the left (step S15: FIG. 4 (G)), and requests a fragmented transfer request. (Remaining) is transmitted to the relay slave station 1-3 (step S16).

  The relay slave station 1-4 that has received the subdivision transfer request (residue) transfers the 188-kbyte subdivided cyclic telegram B (residue) to the relay slave station 1-3 (step S17; FIG. H)).

  The relay slave station 1-3 that has received the cyclic message B (remaining part) stores the cyclic message B-1 (remaining part) from the beginning of the free area of the cyclic message storage unit (step S18), and sends a reception response to the relay element. It returns to the station 1-4 (step S19).

  The relay slave station 1-4 that has received the reception response moves the stored data (cyclic message A) to the front (step S20: FIG. 4 (I)), and transmits a transfer end to the relay slave station 1-3. (Step S21).

  As a result, the cyclic message A held by the relay slave station 1-3 and the cyclic message B held by the relay slave station 1-4 are exchanged with each other.

  By this cyclic message transfer method, even when two or more cyclic messages exist on one cyclic route at the same time, the cyclic messages can be transferred to the other party without any problem.

  The present invention is a multi-stage relay data collection system that collects data from a plurality of measurement points by connecting small-sized communication devices, that is, relay slave stations having short-distance communication means in multiple stages. This can be applied to the field of collecting data such as meter reading values, current transformer voltage values, and distribution line ground fault current values.

The figure explaining the structure of the multistage relay data collection system to which this invention is applied. The functional block diagram explaining the relay slave station to which the cyclic message transfer method according to the present invention is applied. The figure explaining the transmission procedure of the cyclic | annular message transfer method concerning this invention. The figure explaining the transition of the state of the message | telegram storage means in the cyclic message transfer method concerning this invention. The figure explaining the example of the conventional multistage relay data collection system. The figure explaining the other example of the conventional multistage relay data collection system.

Explanation of symbols

3: Routing station 1: Relay slave station 11: Short-distance communication means 12: Travel message relay means 13: Travel message storage means 14: Data collection addition means 15: Travel message creation means 16: Capacity comparison means 17: Transfer rejection creation Means 18: Subdivision transfer request means 19: Cyclic message subdivision means

Claims (2)

The data is collected based on the routing message creation function including the data collection command and routing and the routing station having the communication function for communicating with the relay slave unit, the cyclic message storage area for storing the cyclic message, and the data collection command. In the cyclic message transfer method in the multistage relay data collection system in which the data collection function to collect and the relay slave station having the cyclic message relay function to transfer the received cyclic message based on cyclic routing are sequentially connected in multiple stages,
The routing station creates and sends a traveling telegram containing the data collection command to collect data from the routing and relay slave station,
The relay slave station relays the cyclic message to which the data collected based on the data collection command included in the cyclic message is added based on the routing,
When two relay slave stations each become the destination of the cyclic message transfer, the relay slave station with the smaller free space size of the cyclic message storage area relays the larger one of the free space size of the cyclic message storage area. Subdivide the traveling message to the slave station and send it,
A cyclic message transfer method for a multi-stage relay data collection system, wherein a cyclic message is transmitted and exchanged in order after the empty area size of the smaller free area size is increased. A relay slave station constituting a multistage relay data collection system to which the cyclic message transfer method of claim 1 is applied,
Short-range communication means for transmitting and receiving a cyclic message;
A cyclic message relay means for analyzing the received cyclic message and determining whether or not a data collection command for itself is included and a cyclic route;
A cyclic message storage means for storing a cyclic message to be transmitted and received;
Data collecting and adding means for collecting data based on the data collecting command and adding the data to the circulating message;
A cyclic message creation means for creating a cyclic message transfer request by adding the capacity of the cyclic message to which the collected data is added to the cyclic message;
Capacity comparison means for comparing the capacity of the cyclic message requested to be transferred and the free capacity of the own cyclic message storage area obtained from the capacity of the cyclic message held by itself when receiving the cyclic message transfer request;
A transfer rejection creation means for creating a transfer rejection including the free capacity of its own cyclic message storage area when the capacity of the cyclic message requested to be transferred is larger than the free capacity of its own cyclic message storage area;
When a transfer rejection is received, a fragmented transfer request means for creating a fragmented transfer request for requesting to subdivide and transmit a cyclic message to a size corresponding to the free capacity of its own cyclic message storage area;
When a subdivision transfer request is received, it has a cyclic message subdivision means for subdividing its own cyclic message into the requested size, and the maximum is available to relay slave stations with a large free area of the cyclic message storage area. The capacity of the circulating message is subdivided and transferred, and the circulating message received from the relay slave station that initially had the largest free area is stored in the free area of the circulating message storage area that is generated as a result of this transfer. A relay slave station constituting a multistage relay data collection system, wherein the remainder of a cyclic message is transferred to a relay slave station having a large free space first.

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