JP2000261867A - Communication system for remote supervisory system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a transmission efficiency on the occurrence of a fault in a slave station in a communication system for a remote supervisory system. SOLUTION: A central supervisory device 1 is provided with a command transmission means 4 to collect data from slave stations 2a, 2b and a time-out time setting means 5 to set a timer for monitoring a reply from the slave station 2 with a command sent from the command transmission means 4. The slave station 2 is provided with response transmission means 6a, 6b that transmit data in the inside of the slave station and data received from site installations 7a, 7b and edited to the central supervisory device 1 as a response by a command form the central supervisory device 1, and the central supervisory device 1 sets an individual time-out time with respect to kinds of commands sent to the slave station 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system between a central monitoring device and a slave station in a remote monitoring system for monitoring plant equipment and the like.

[0002]

2. Description of the Related Art In general, a remote monitoring system includes a central monitoring device installed in a monitoring room and a plurality of slave stations installed at a site such as a plant facility. The central monitoring device collects data from the slave stations by a polling method and displays the data on the display device of the central monitoring device. The slave station transmits data to the central monitoring device as a response to the command of the central monitoring device. If the slave station cannot send the response data due to an error, the central monitoring device determines that the slave station is abnormal due to the timeout period set in advance for the command, and sends the command to the next slave station. Submit and collect data.

The data collected by the central monitoring device from the slave station includes slave station diagnostic information indicating the state of the slave station, display information input from on-site equipment, and measurement information. These pieces of information have different data amounts, the slave station diagnostic information has a small data amount, the display information and the measurement information have a large data amount, but the timeout time for the central monitoring device to monitor the response from the slave station is one. Since only one can be set, it is set according to display information or measurement information having a large data amount. The central monitoring device also sends a command to the abnormal slave station.In this case, it sends a command to collect slave station diagnostic information, and if there is no response, displays the display information and measurement information. It does not send commands to collect.

[0004]

However, according to the above-mentioned conventional method, when the slave station is abnormal, the central monitoring device waits for a timeout time for each command sent to the abnormal slave station. It becomes necessary. Since the time-out period needs to be set for the data having the largest data amount among the data collected from the slave stations, the transmission efficiency deteriorates.

Accordingly, an object of the present invention is to provide a communication system of a remote monitoring system with high transmission efficiency even when a slave station is abnormal.

[0006]

According to the present invention, there is provided a remote monitoring system for monitoring a site facility by connecting a central monitoring device and a plurality of slave stations via a transmission line. In the communication system for transmitting data of the on-site equipment from a slave station, the central monitoring device transmits a command from the slave station by a command transmission unit for collecting data from the slave station and a command transmitted by the command transmission unit. A timeout time setting means for setting a timer for monitoring a response, wherein the slave station receives a command from the central monitoring device, and inputs and edits data inside the slave station or data edited from the on-site equipment as a response. A response transmission unit for transmitting to the central monitoring device, wherein the central monitoring device has an individual To be able to set a timeout period.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a remote monitoring system according to the present invention. A central monitoring apparatus 1 is connected to slave stations 2a and 2b via a transmission line 3. The central monitoring device 1 has a command (S) 41 for collecting slave station diagnostic information from the slave stations 2a and 2b, a command (DI) 42 for collecting display information, and a command (A) for collecting measurement information.
I) a command transmission means 4 for transmitting 43, and a timer for monitoring the reception of data transmitted from the slave stations 2a and 2b by each command 41 to 43,
A timeout time setting means 5 is provided for setting the timeout time (S) 51, the timeout time (DI) 52, and the timeout time (AI) 53 for the types 1 to 43, respectively.

The slave stations 2a and 2b receive data from the on-site facilities 7a and 7b, edit the slave station diagnosis information, display information, and measurement information, and respond to each command 41 to 43 from the central monitoring device 1 (S). 61a, 61b, response (D
I) 62a, 62b, response (AI) 63a, 63
b are provided, respectively.

FIG. 2 shows a sequence of a communication system of the remote monitoring system according to the present invention, in which both the slave stations 2a and 2b are normal. The central monitoring device 1 transmits a command (S) 41a to the slave station 2a to collect slave station diagnostic information of the slave station 2a. The slave station 2a transmits the slave station diagnosis information of the own station to the central monitoring device 1 by a response (S) 61a in response to the command (S) 41a.

Next, the central monitoring device 1 sends a command (DI) 42a to collect display information of the slave station 2a.
Send to The slave station 2a transmits the command (DI) 42a to the central monitoring device 1 by using the response (DI) 62a to input and edit the display information input and edited from the on-site equipment 7a. Next, the central monitoring device 1 transmits a command (AI) 43a to the slave station 2a to collect measurement information of the slave station 2a. The slave station 2a transmits the measurement information input and edited by the own station from the on-site equipment 7a to the central monitoring apparatus 1 as a response (AI) 63a.

Next, the central monitoring device 1 issues a command (S) 4 to the slave station 2b in order to collect data of the slave station 2b.
1b, command (DI) 42b, command (AI) 43
b is transmitted as described above. The slave station 2b issues a command (S)
Response (S) 61b and command (D
I) A response (DI) 62b to 42b and a response (AI) 63b to command (AI) 43b are transmitted to the central monitoring device 1 respectively. The above processing is repeated, and the central monitoring device 1 sequentially updates the information.

FIG. 3 shows a case where only the slave station 2a is abnormal. The central monitoring device 1 transmits the command (S) 41a to the slave station 2a, but the slave station 2a is abnormal, and thus the response (S)
61a cannot be transmitted. Since the central monitoring device 1 cannot receive the response (S) 61a, it waits for the timeout time (S) 51, determines that the slave station 2a is abnormal, and sends a command (S) 41b and a command (DI) to the slave station 2b. 42b, and transmits a command (AI) 43b to collect data from the slave station 2b.

The central monitoring device 1 is in the abnormal slave station 2
a, only the command (S) 41a is transmitted,
The abnormality of the slave station 2a is determined by whether there is a response,
A command (D
I) 42a and command (AI) 43a are not transmitted.

FIG. 4 shows the timeout periods 51 to 53 set by the central monitoring device 1. The timeout period (S) 51 is determined by the central monitoring device 1 by the command (S) 4
1 is set in consideration of the time from transmission of 1 to reception of the response (S) 61 of the slave station 2. Similarly, a timeout period (DI) 52 is set from the command (DI) 42 and the response (DI) 62, and a timeout period (AI) 53 is set from the command (AI) 43 and the response (AI) 63. Since the response (S) 61 has a small amount of data, the timeout period (S) is set short, and the response (AI) 63 has a large amount of data, so that the timeout period (AI) 53 is set long.

As shown in FIG. 3, when the slave station 2a is abnormal, the central monitoring device 1 transmits a command (S) 41 to the slave station 2a and then sends a response (S) 61.
Time-out (S) 51 for trying to receive
The timeout period (S) 51 can be set short as shown in FIG. 4, so that the waiting time for the abnormal slave station 2a can be shortened.

[0016]

According to the communication system of the present invention, when one of a plurality of slave stations becomes abnormal, the central monitoring device shortens the timeout period for monitoring the response to the abnormal slave station. Since it can be set, communication efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of an embodiment of a communication system of a remote monitoring system according to the present invention.

FIG. 2 is an explanatory diagram of the transmission sequence.

FIG. 3 is an explanatory diagram of the transmission sequence.

FIG. 4 is an explanatory diagram of setting a timeout time.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Central monitoring apparatus 2a, 2b Slave station 3 Transmission line 4 Command transmission means 5 Timeout time setting means 6a, 6b Response transmission means 7a, 7b Field facilities 41a, 41b Command (S) 42a, 42b Command (DI) 43a, 43b Command (AI) 51 Timeout time (S) 52 Timeout time (DI) 53 Timeout time (AI) 61a, 61b Response (S) 62a, 62b Response (DI) 63a, 63b Response (AI)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G05B 23/02 302 G05B 23/02 302P G08B 25/00 520 G08B 25/00 520Z G08C 15/00 G08C 15 / 00 EF term (reference) 2F073 AA12 AA19 AB02 AB03 BB04 BC01 CC01 CC11 DD02 DE12 5C087 BB03 BB46 BB51 BB74 CC02 CC46 DD08 DD21 EE15 FF01 FF02 GG30 GG70 5H223 AA01 DD07 DD09 EE18 FF08 5B048 EB08 EB08 BA08EB03 EB08 FA07 GB05 HA01 HA02

Claims (1)

[Claims] 1. A remote monitoring system for monitoring a site facility by connecting a central monitoring device and a plurality of slave stations via a transmission line, wherein the remote station receives data of the site facility from the slave station at the request of the central monitoring device. In the communication system, the central monitoring device includes a command transmission unit for collecting data from the slave station, and a timer for monitoring a response from the slave station by a command transmitted by the command transmission unit. A time-out time setting means for setting, wherein the slave station transmits a response to the central monitoring apparatus as a response to data from the local station or data input and edited from the on-site equipment as a response to the command from the central monitoring apparatus. Means, wherein the central monitoring device can set an individual timeout time for the type of command transmitted to the slave station. And so, the communication system of the remote monitor system, characterized in that.