JP3441826B2 - Communication system with communication device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for collecting or controlling the state of a controlled device connected to a slave station device from a master station device. The present invention relates to a communication control device characterized by a high control signal data and information data transmission method. 2. Description of the Related Art Conventionally, as a method of transmitting a signal having a high degree of urgency to a receiving terminal, for example, as described in Japanese Patent Laid-Open No. 3-227154, a monitoring line between a monitoring control device and a plurality of transmission devices is disclosed. In some cases, the monitoring line for polling and the monitoring line for a failure are separated. Japanese Patent Application Laid-Open No. 62-187800 similarly discloses a first line and a child unit for interconnecting a master station device and a plurality of slave station devices to improve the immediacy and transmission efficiency of information as a whole system. In some cases, a second line for notifying a state change from the station device is provided. [0003] First, when a dedicated signal line or the like is not provided, the slave station device cannot transmit new information until it receives polling from the master station device. There was a disadvantage that it lacked. Therefore, there is a problem that the responsiveness of information data and the transmission efficiency decrease as the number of slave station devices in the entire system increases. In addition, as disclosed in the above-mentioned prior art, providing a new dedicated line requires a great deal of cost to provide a dedicated line when the master station device and the slave station device are far apart. There is a problem. [0005] Further, the data format of communication data in the polling system uses a character data format, and one response to one request is a normal procedure. One request / response of communication data including a control signal for controlling a controlled station in a character data format lacks reliability. The same applies to the rationality check of character data. For example, in a control signal for controlling a device to be controlled, a rationality check such as a check of a fixed mark and an effective control for preventing erroneous control are performed. It is impossible to adopt a two-behavior control method as a means. An object of the present invention is to provide a highly reliable communication apparatus and communication system for data transmission, which is the above-mentioned drawback. According to the present invention, there is provided a communication apparatus serving as a master station and a communication apparatus serving as a plurality of slave stations.
Are connected via a communication line, and the communication device that is the master station is
Connected to the communication device that is the slave station by the
A communication system that collects and controls the status of controlled devices
The communication device of the slave station transmits character data.
A first transmission / reception processing unit for performing transmission / reception processing, and a cyclic transmission / reception processing unit
A second transmission / reception processing unit for performing data transmission / reception processing;
The first transmission / reception processing unit and the second transmission / reception
And a line switching processor that switches between the
And the communication device transmits and receives character data.
A first transmission / reception processing unit for performing processing, and cyclic data
A second transmission / reception processing unit for performing transmission / reception processing of
The first transmission / reception processing unit and the second transmission / reception processing based on the
Having a line switching processing unit for switching between
A plurality of information collection devices, wherein the master station
Communicate with one of the slave stations via one of the collection devices
Character data from a slave station different from the communicating slave station.
When there is a communication request from the plurality of information collecting devices,
This can be achieved by accepting the request via the other . [0010] More preferably, the master station apparatus is achieved by having two or more of the first transmission / reception processing unit, the second transmission / reception processing unit, and the line switching processing unit. A communication device as a master station and a communication device as a plurality of slave stations
And a communication device which is the master station.
Is connected to the communication device that is the slave station by polling.
Communication system that collects and controls the status of the controlled equipment
In the system, the communication devices of the master station and the slave station are key.
First transmission / reception processing unit for transmitting / receiving character data
And second transmission / reception for performing transmission / reception processing of cyclic data
A communication processing unit, the first transmission / reception processing based on the received information.
Disconnection for switching between the control unit and the second transmission / reception processing unit
With the replacement processing unit, the initial line connection
Uses unreliable data, and after the line is connected
Be able to use highly reliable data
You. In other words, the use of data with low reliability and a small amount of information in the connection of a line, and the use of data with a relatively large amount of information but a high reliability after the connection of the line enable efficient use of the line. can do. FIG. 1 shows an embodiment of the present invention. In this system, a master station device 1 and a plurality of slave station devices 11 are connected via a communication network 10. Each slave station device 11 is connected to a controlled device 12 such as a sensor, a pump, or a valve. To operate the controlled device, an operator selects a desired slave station device 11 in the master station device 1 and inputs information such as the start and stop of operation of the controlled device 12. The input information is transmitted to the slave station device 11 designated by the operator via the communication network 10, and
Then, the transmitted information is analyzed, and if the information is the operation start, the operation of the controlled device 12 is started. If the information is stopped, the operation of the controlled device 12 is stopped. On the other hand, as shown in FIG. 2, the slave station device 11 sequentially transmits the temperature information and the information such as the number of rotations of the pump from the sensor to the master station device 1 to the master station device 1. Is configured so that the operator can grasp the operating state of each controlled device 12. Further, the slave station device 11 determines whether the connected device is in a normal state or an abnormal state based on information taken from a sensor or the like (the monitoring control processing unit 2).
), And transmits the determination result to the master station device 1. Next, the configurations of the master station device 1 and the slave station device 11 according to the present invention will be described. The master station device 1 is an input device for inputting selection, operation start, operation stop, and the like of the slave station device 11 to be connected to the controlled device 12 by the operator, and displays information transmitted from the slave station device 11 on a monitor or the like. A monitoring control processing unit 2 having a display device for performing the operation, an information collection device 8 for transmitting information generated by the monitoring control processing unit 2 to the slave station device 11 or receiving information transmitted from the slave station device 11, 9. Further, the information collection devices 8 and 9 are connected to the slave station device 11 and receive information from the slave station device 11 or transmit information to the slave station device 11 by using the NCU device 4 and the character data format method. A line switching control processing unit 5 for controlling switching to the click data format system and a line switching circuit 7 for actually switching lines are added, and the conventional transmission / reception processing unit 6 is subdivided into functions according to line switching. A line connection processing unit 3 for processing up to line connection by character data including control, and an information data transmission / reception processing unit 6 for transmitting / receiving cyclic data as information data. This is the same for the slave station device 11. Furthermore, the information collecting apparatus 8 can be multiplexed by providing expandability by a representative telephone system or the like. As an example, a case where the information collecting apparatus 8 is duplicated will be described below. When the information collecting apparatus 8 communicates with the master station apparatus 1 while a communication between the information collecting apparatus 8 and the slave station apparatus 11 is being performed (information is being collected or controlled), a state change occurs in the slave station apparatus 11 n. The master station device 1 performs data communication by connecting to a line at the receivable information collection device 9. This is because the information collection device 8 of the master station device 1 is duplicated, so that the communication request from the slave station device can be transmitted by the representative telephone system or the like even while the information collection device 8 is communicating.
It connects to the other waiting information collection device 9 and enables communication with the slave station device 11. That is, new information data whose state has changed can be transmitted without waiting for polling from the master station device 1. As a result, it is possible to more quickly and easily grasp a state change or the like that has occurred in an emergency. More specifically, immediately after the master station device 1 starts polling from the information collection device 8 to the slave station device 11a,
In the case of n in the slave station device 11, when an emergency occurs, for example, data obtained from a sensor is determined, and when it is a pump failure and a spare pump is operated, the pump failure data is stored in the controlled device 12. From the slave station device 11
Is input to the monitoring control processing unit 2 of n.
Then, a line connection request is instructed to the line connection processing unit 3 to the master station device 1, and the NCU device 4 makes a connection request to the master station device 1 via the communication line 10. In the master station device 1, a line connection is performed by the NCU device 4, which is the information collection device 9, via the communication line 10. The notification of the line connection completion is transferred from the NCU device 4 of the information collecting device 9 to the line connection processing unit 3 as character data. This is the same for the slave station device 11. The line connection processing unit 3 of n of the slave station device 11 recognizes that the line has been connected, and transmits, for example, the slave station device No. recognition data (character data) as shown in FIG. The line connection processing unit 3 of the master station device 1 recognizes that the line has been connected, and is transmitted from the slave station device 11.
Waiting for the slave station device No. recognition data indicating which slave station device 11 has caused the state change, the communication line 10 and the NCU
When the slave station device No. recognition data is received via the device 4,
The processing as shown in FIG. 8 is performed. In other words, the master station device 1 determines in advance the slave station device No. to be processed by itself,
o. It has in advance as the data buffer 21 and determines whether the slave station No. of the received recognition data is the slave station No. to be processed by the processing of checking the slave station No. to be processed.
If the check result 22 indicates that there is a target slave station device, it is determined that a line connection has been established, a line switching request is sent to the line switching control processing unit 5 of the information collection device 9, and the fact that the line connection has been established is sent to the transmission / reception processing unit 6. Contact each. If the recognition data cannot be received after a certain period of time, or if the check result indicates that there is no slave station to be processed, the processing is stopped there and data from the next new slave station can be accepted. Return to As a result, the line state is unstable (transmission data error, etc.), the transmission data cannot be recognized, the connection is incorrect (such as a wrong telephone), etc., and the occupation time of the line is suppressed, and erroneous display and erroneous control are prevented. . In the line switching control processing section 5,
The line switching circuit 7 is operated in response to the line switching request, the line is switched from the line connection processing unit 3 to the transmission / reception processing unit 6, and the answer back data is waited for. Contact 6. This is the same for the slave station device. The transmission / reception processing unit 6 of the master station device 1 waits for the completion of the line switching, and transmits the information request data in the control signal data format shown in FIG. 7A via the NCU device 4 and the communication line 10 to the target slave station. N of the slave station device 11
Transmit to On the other hand, the transmission / reception processing unit 6 of n of the slave station device 11 sends data of the information data format shown in FIG. 7B as response data to the master station device 1 via the NCU device 4 and the communication line 10. The transmission / reception processing unit 6 of the master station device 1 receives and edits information data (state change data) from n of the slave station device 11. The procedure of the information request data / response data can be performed n times by making use of the feature of the cyclic data, and the state change data generated during communication can be collected. For n times, an optimal value is used depending on the system configuration. The edited data includes the received data,
The edit data is transferred to the monitoring control processing unit 2 and subjected to man-machine interface processing. That is, the operator is informed by displaying / warning that a pump failure has occurred. After data transfer to the monitoring control processing unit 2, the transmission / reception processing unit 6 of the master station device 1 notifies the slave station device 11 of the line disconnection, and executes a line connection completion process. The line connection completion processing is performed by the line switching control processing unit 5
The line switching control processing unit 5 operates the line switching circuit 7 in response to the line switching request and waits for answer back data as a result of the line switching.
Is switched to the line connection processing unit 3, the completion of the switching is notified to the transmission / reception processing unit 6, and the line connection completion processing ends. This line connection completion processing is the same for the slave station device. By the line connection completion processing, the master station device 1
It is possible to respond to the status change data from the next new slave station device, and the slave station device 11 can be called from the master station device 1 or notified of the status change. As described above, it is possible to improve the responsiveness to the state change of the information data generated in an emergency. As is apparent from the above description, FIG . 4 is a time chart showing the basic data flow of the embodiment, and FIG. 5 shows a plurality of information collection devices (2 in the example) of the master station device.
3) shows a time chart for the case of the configuration of FIG. Next, a control method using control signal data for a controlled device to cope with a state change occurring in an emergency will be described with reference to the flowchart of FIG. Failure occurs,
A case will be described as an example where a spare pump is operated. First, the slave control unit No., which indicates which slave unit is to be controlled from the monitoring control processing unit 2 to the line connection processing unit 3 by the operation of the operator who has recognized the pump failure, and which device (here, , Backup pumps) are input (step 21). The line connection processing unit 3 issues a line connection request to the NCU 4 based on the input slave station No., and establishes a line connection with the slave station via the communication line 10 (step 22). . The NCU 4 notifies that the line has been connected (Step 23), and issues a line switching request command to the line switching control processing unit 5 to switch to the cyclic data format (Step 24). In the line switching control processing unit 5,
The line switching circuit 7 is operated in response to the line switching request command, and waits for answerback data as a switching result (step 25).
The line switching is performed, and the completion of the switching is notified to the transmission / reception processing unit 6. The transmission / reception processor 6 waits for the completion of the line switching, and inputs the device code X input in step 21.
The control data of the control signal data format shown in FIG. 8A is transmitted to the slave station device connected to the line via the NCU device 4 and the communication line 10 using n and Yn as control signal data (step 26). On the other hand, the slave station device checks the rationality of the received control signal (parity, inverted continuous transmission check, etc.) and checks whether the received control signal is a control signal for its own station, and then returns to FIG. The data of the indicated information data format is sent to the master station as response data. The data received by the master station device (step 2
7) performs a rationality check (parity, reverse continuous transmission check, etc.), and edits if rational (step 28)
Then, the data is transferred to the monitoring control processing unit 2. The received data includes the selection completed position. In the control method, as a response to the selection signal from the master station device to the slave station device, the slave station device returns a selection completion signal to the master station device, and after confirming the selection completion signal, the operator operates the operation signal. Is output to the slave station device, that is, a two-behavior control method in which control signal transmission is divided into two stages of selection signal transmission and operation signal transmission is adopted to improve reliability. The monitoring control processing unit 2 displays the selection completion position, prompts the operator for an operation command, confirms it, and issues an operation command. As described above, the control of necessary equipment is repeated, and when the control is completed (step 29), the control end is notified from the monitoring control processing unit 2 to the transmission / reception processing unit 6, that is, the line connection disconnection request is notified, Notify that the line is disconnected. In response to the line disconnection request, the transmission / reception processing unit 6 instructs the line switching control processing unit 5 to change to the character data format, that is, instructs a line switching request (step 30). In the line switching control processing unit 5,
The line switching circuit 7 is operated in response to the line switching request instruction, and waits for answer back data including the switching result (step 31). The line is switched from the transmission / reception processing unit 6 to the line connection processing unit 3, and the switching is completed. The fact is notified to the transmission / reception processing unit 6. Thereby, control for the next new slave station device becomes possible. As is apparent from the above detailed description, according to the present invention, in a system using an inexpensive communication line, a line connection is made by using an NCU device for a master station device and a slave station device. At the time, a line link is performed with the minimum necessary data using a character data format for the purpose of immediately performing a line link. At the time of collecting information data, there is high reliability and a cyclic method suitable for n times transmission. Use data format. By using these two types of data formats, the rationality check of information data is strengthened, and the transmission of highly reliable control signal data to the controlled device by adopting the dual behavior control method for the controlled device and the information collection Becomes possible. Further, a plurality of information collecting devices for the purpose of collecting or controlling (controlling) information of the controlled device are provided, multiplexed, and the plurality of information collecting devices are controlled. Even during the polling by the collection device, it is possible to immediately notify the operator of a state change or the like in an emergency by another information collection device in the receivable state.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an embodiment according to the present invention, in which a schematic diagram of an entire configuration is shown in a block diagram. FIG. 2 shows a time chart in a polling method when information on a child station device is periodically collected. FIG. 3 shows a flowchart at the time of control. FIG. 4 is a time chart showing the operation of the embodiment according to the present invention. FIG. 5 is a time chart showing the operation of the embodiment according to the present invention. FIG. 6 shows an example of a data format of recognition data. FIG. 7 shows an example of a data format of information data. FIG. 8 is a block diagram showing a process of checking a target slave station device No. to check whether it is a target slave station device to process. [Explanation of Reference Codes] 1 ... master station device, 2 ... monitoring control processing unit, 3 ... line connection processing unit, 4 ... NCU device, 5 ... line switching control processing unit, 6 ... transmission / reception processing unit, 7 ... line switching circuit, 8,
9 Information collection device, 10 Communication line network, 11 Child station device, 12 Device to be controlled, 20 Child device to be processed N
o. Check processing, 21: target slave station No. data buffer, 22: check result.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hideyuki Tadokoro 5-2-1 Omika-cho, Hitachi City, Ibaraki Prefecture Inside the Hitachi, Ltd. Omika Plant (72) Inventor Yo Takahashi 3-chome, Sachi-cho, Hitachi City, Ibaraki Prefecture No. 1 within Hitachi Engineering Co., Ltd. (56) References JP-A-61-13846 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04Q 9/00

Claims (1)

(57) [Claims 1] A communication device serving as a master station and a plurality of communication devices serving as slave stations are connected via a communication line, and the communication device serving as the master station uses a polling method. in a communication system for performing status acquisition and control of the controlled target device connected to the communication device which is the child station, a communication device of the slave station and the first reception processing unit that performs transmission and reception processing of the character data, rhinoceros and a second transceiver unit which transmits and receives the click data, and the first reception processing unit on the basis of the received information line switching unit for switching between the second transmission and reception processing section, the For the master station, the communication device sends and receives character data.
A first transmission / reception processing unit for performing
A second transmission / reception processing unit for performing reception processing, and
The first transmission / reception processing unit and the second transmission / reception processing unit
Information switching unit having a line switching processing unit for switching
A plurality of collecting devices, and the master station is connected to the master station via one of the plurality of information collecting devices.
While communicating with one of the slave stations, a different
When there is a communication request using character data from a slave station,
Accepts a request through the other of the plurality of information collection devices
Communication system according to claim Rukoto.