JP3232938B2 - Remote monitoring and control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the operation of
Binary state data such as stop, on / off, etc. is periodically taken in, and state change data (also referred to as state change data) for each target device is created from the previous taken data and the present taken data, and transmitted to the transmission line. A remote monitoring and control system comprising a transmission device and an upper station that updates status data of each target device from the transmitted status change data and monitors and controls the target device corresponding to the status change data. In particular, the transmission apparatus only transmits data in the form of "state change data", so that the upper station can also create initial state data of all target devices, thereby simplifying the processing of the transmission apparatus and the upper station. And a remote monitoring control system as described above.

[0002] In the drawings, the same reference numerals indicate the same or corresponding parts.

[0003]

2. Description of the Related Art FIG. 2 is a diagram for explaining the operation of a main part of a conventional remote monitoring control system. In the figure, 01 is a transmission device, 02 (02-1, 02-2) is a duplexed upper station, and 03 is a transmission line connecting the transmission device 01 and the upper stations 02-1 and 02-2. Here, the upper station 02-1 is also referred to as an upper station of the # 1 system, and the upper station 02-2 is also referred to as an upper station of the # 2 system.

[0004] In the transmission device 01, 1 is taken from a number of devices to be monitored and controlled (not shown) at predetermined intervals.
Input data consisting of binary data indicating the current state of operation / stop, on / off, etc. of each target device, 2 is the current value data as the current acquisition data of the input data 1, and 3 is the previous value data. This is previous value data as fetched data. In the upper stations 02-1 and 02-2, reference numeral 21 denotes state data (state information) of each target device stored in each upper station, and reference numeral 22 denotes state change data.

The transmission apparatus 01 takes in the input data 1 in advance and sets it as current value data 2, and sets the current value data 2 as status data 11 for the # 1 system and status data 12 for the # 2 system as a transmission switch (hereinafter referred to as a transmission switch). (The switch is also described as SW) 15
Are closed, and the higher-level stations 02-1 and 02-
2, the status data 11 and 12 are stored as status information 21 in each of the upper stations 02-1 and 02-2. Then, the transmission apparatus 01 transfers the current value data 2 to the copy path 5
To make the previous value data 3.

The transmission apparatus 01 takes in the input data 1 in the next cycle and sets it as the present value data 2, compares the previous value data 3 with the present value data 2 via the state change checking means 4, and changes the state for each target device. The status change data for each target device is stored as the # 1 type status change data 8 and the # 2 type status change data 9 if there is a status change. 02-1 and 02-2, the status change data 8 and 9 are transmitted to the upper-level stations 02-1 and 02-2.
2 is stored. Then, the transmission apparatus 01 copies the current value data 2 to the previous value data 3, and updates the # 1 system state data 11 with the # 1 system state change data 8. Similarly, the # 2 system state data 12 is updated with the # 2 system state change data 9.

On the other hand, the upper stations 02-1 and 02-2 update the state information 21 using the state change data 22, respectively. Then, the upper station that has become the active side (in this example, it is 02-1)
Performs predetermined processing such as monitoring and control of target devices corresponding to the state change data 22, for example, changing the status display of each target device, outputting a buzzer, and the like. Thereafter, a state change is checked by taking in the new current value data 2 every period, and the same operation as described above is repeated.

Next, when the upper station 02-1 of the operating system becomes abnormal, the upper station 02-2 of the standby system becomes the upper station 02-2.
Monitor and control the target device in place of -1. Next, when the upper station 02-1 returns from the abnormal state to the normal state and becomes an operating system, the upper station 02-1 transmits the transmission device 01 during the period of the abnormality.
Failed to receive the state change data 8 from
Prior to operation, it is necessary to initialize the state information 21 to the latest state. Then, the status information request 13 is transmitted to the transmission device 01.

In response to the request 13, the transmission apparatus 01 opens the interruption SW 14 and closes the transmission SW 15, interrupts the processing of the status change checking means 4, and outputs # 1 system data as all status data indicating the current status of all target devices. Usage state data 11
To the host station 02-1. After that, the transmission device 01
Closes the interruption SW 14 and opens the transmission SW 15 to restart the operation of the state change checking means 4.

[0010]

As described above, in the conventional remote monitoring and control system, since two types of state change data 8 or 9 and state data 11 or 12 exist between the transmission apparatus 01 and the upper station 02, the transmission side , Both sides need to process two types of data. Therefore, an object of the present invention is to provide a remote monitoring control system that can simplify the state matching process by preventing the transmission device 01 from transmitting state data to the upper station 02.

[0011]

In order to solve the above-mentioned problems, in the remote monitoring control system according to the first aspect, binary state data (input data 1, hereinafter referred to as all state data) for each target device is predetermined. The state of each target device is fetched in a cycle, and each time (via the state change checking means 4) the state data of the last time fetched from the previously fetched state data (previous value data 3) to the currently fetched state data (current value data 2) A transmission device (01) for producing change data (state change data 8, 9); and all state data received in advance (via the transmission path 03) from the transmission device and stored (as state information 21). It receives state change data generated at predetermined intervals from the transmission device, updates all state data stored therein, and monitors and controls target devices corresponding to newly received state change data (state change data 22). Place In the remote monitoring control system provided with the upper station (02) that performs the above processing, the transmission device replaces the all state data transmitted to the upper station in advance with the all state data (inverting means 6). ) State change data (hereinafter referred to as initial state change data) from inverted data to all state data taken in this time is created and transmitted to an upper station, and the upper station obtains all state data from the initial state change data. Remember.

According to a second aspect of the present invention, there is provided a remote monitoring and control system according to the first aspect.
The transmission device adds identification data (initial state change flag) for distinguishing this data from normal state change data to the initial state change data. Further, in the remote monitoring and control system according to claim 3, in the remote monitoring and control system according to claim 1 or 2, when the upper station is duplicated and one of the upper stations recovers from an abnormality, the transmission device is connected to the upper station. The initial state change data is transmitted only to the recovered upper station (using the off-switch SW17 when the other system is restored).

[0013]

The transmission device has a function of inverting the current value data and comparing the current value data with the current value data to create initial state change data as if the state of all devices has changed. Is transmitted to the upper station instead of all state data. When transmitting the initial state change data to the upper station, a flag is added so as to be distinguishable from the normal state change data, and the upper station discriminates the state change data from the initial state change data with this flag. Have a function.

The state change data can be distinguished from a state change of the state data of the target device from "0" to "1" or a state change from "1" to "0". With this configuration, it is possible to generate all state data indicating the current state of all target devices from the initial state change data. If the received state change data is the initial state change data, the upper station creates all state data from the initial state change data and stores it as new state information 21. If the received status change data is normal status change data, the status information 21 is updated using the status change data and a predetermined process based on the status change is performed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram of the operation of the main part of a remote monitoring control system according to the present invention. 2, the transmission apparatus 01 switches between the current value data 2 and the previous value data 3 when the # 1 system or # 2 system returns from the abnormal state to the normal state, or during the initial processing in FIG. In addition, a switch SW16 at the time of abnormality recovery and a reversing means 6 for reversing the current value data 2 are added.

Further, an interruption SW1 is provided between the state change checking means 4 and the # 1 system state change data 8 and the # 2 system state change data 9.
In place of 4, an off-switch SW 17 for when the other system recovers abnormally is provided when the other system recovers abnormally. The # 1 system status data 11, the # 2 system status data 12, and the transmission SW 15 in FIG. 2 are deleted. ing. In the input section of the transmission data to the upper stations 02-1 and 02-2, there is provided an initial state change data time switch SW18 which is switched when receiving the initial state change data.

The operation of FIG. 1 will be described. When the transmission apparatus 01 knows that the upper-level station 02-1 has recovered from an error, for example, it switches the recovery-time recovery switch 16 to turn off the copy path 5 side.
The reversing means 6 is turned on. Then, the current value data 2 fetching the input data 1 is inverted via the inversion means 6 to be the previous value data 3. Next, the current value data 2 is compared with the previous value data 3, which is the inverted data thereof, via the state change checking means 4 to extract the state change data. The state change data is data (change state data) indicating a change in which all the target devices are in the state of the current value data 2. From this state change data, the current state data (all state data) of all the target apparatuses is obtained. Obtained easily. Therefore, the transmission apparatus 01 stores the all-state change data (referred to as the initial state change data) in the # 1 system state change data 8 and further stores the initial state change data in order to distinguish it from the normal state change data. A state change flag is added to the data and transmitted to the upper station 02-1 via the transmission path 03.

At this time, the off-switch 17 of the # 2 system when the other system is restored from the abnormal state is turned off, and the initial state change data (all state change data) is not set in the # 2 system state change data 9 portion. When the transmitted state change data has the initial state change flag, the upper station 02 switches the initial state change data time switch SW.
By switching 18, the initial state change data is not stored in the state change data 22 part, but all state data is obtained from the initial state change data and stored in the state information 21 part.

After setting the initial state change data in the # 1 system state change data 8 as described above, the transmission apparatus 01 returns the abnormality recovery time switch SW 16 to the original state (the state shown in the figure), and the copy path 5 Then, the current value data 2 is copied to the previous value data 3 and the # 2 other-system error recovery-time off switch 17 is turned on to start normal state change detection processing. That is, the input data 1 is fetched at a predetermined cycle and is set as the current value data 2. The current value data 2 and the previous value data 3 are compared by the status change checking means 4 to generate the status change data, and the # 1 system status change data 8, After being stored as the # 2 system state change data 9, the data 8, 9 are transmitted to the upper stations 02-1, 02-2, respectively.

The upper stations 02-1 and 02-2 return the initial state change data time switch 18 to the original state (the state shown in the figure), and change the state change data 8 and 9 transmitted from the transmission apparatus 01. The state information 21 is stored as data 22 and the state information 21 is updated using the state change data 22. Then, the upper station of the operating system (02-1 in this example) performs a process corresponding to the state change data.

[0021]

According to the present invention, the data relating to the state of the target device to be transmitted from the transmission apparatus to the upper station is unified into the form of state change data.
Instead of the transmitter transmitting the status data of all target devices as before, the initial status change flag is added to the status change data (initial status change data) obtained by comparing the current value data with its inverted data. Then, the upper station sees this flag, and performs the processing of creating the latest state information of all the target devices from the initial state change data and updating the state information 21 so far. The upper station does not need to process the transmission data of the transmission device in a complicated procedure, and can adjust its own state information to the correct current state with relatively simple logic.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an operation of a main part of a remote monitoring control system according to the present invention;

FIG. 2 is an explanatory diagram of an operation of a main part of a conventional remote monitoring and control system.

[Description of Signs] 01 Transmission device 02 (02-1, 02-2) Upper station (02-1 # 1 system upper station) (02-2 # 2 system upper station) 03 Transmission line 1 Input data 2 Current value data 3 Previous value data 4 State change checking means 5 Copy path 6 Inverting means 8 # 1 system state change data 9 # 2 system state change data 16 # 1 system or # 2 system abnormal return switch SW 17 Other system abnormal return OFF SW 18 Initial state change data switching SW 21 State information 22 State change data

Continuation of front page (56) References JP-A-5-191454 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04Q 9/00-9/16 G05B 19/00-19 / 02

Claims (3)

(57) [Claims] 1. Binary state data (hereinafter referred to as "all state data") for each target device is fetched at a predetermined cycle, and each time the previously fetched all state data is fetched from the previously fetched all state data to the currently fetched all state data for each target device. A transmission device that creates state change data of, and previously receives and stores all state data from the transmission device;
Thereafter, while receiving the state change data generated at predetermined intervals from the transmission device, updating all the state data stored therein, and performing predetermined control such as monitoring control of the target device corresponding to the newly received state change data. In the remote monitoring control system including a higher-level station that performs processing, the transmission device replaces the all-state data that is transmitted to the higher-level station in advance, and replaces the all-state data that has been captured this time with the entire state that has been captured this time. Characterized in that state change data to data (hereinafter referred to as initial state change data) is created and transmitted to an upper station, and the upper station obtains and stores all state data from the initial state change data. Monitoring and control system. 2. The remote monitoring and control system according to claim 1, wherein the transmission device adds identification data for distinguishing the data from the normal state change data to the initial state change data. A remote monitoring control system. 3. The remote monitoring and control system according to claim 1, wherein the upper station is duplexed, and when one of the upper stations recovers from an abnormality, the transmission device recovers the initial state change data. A remote monitoring control system characterized in that transmission is made only to the upper-level station that has been set.