JPS626550A - Hierarchy decentralized control system - Google Patents

Abstract

PURPOSE:To refresh a screen at high speed by collecting data to be displayed in a common memory while the data is being updated at a prescribed period depending on the control of a host and subordinate control section based on a command from a data display device. CONSTITUTION:A data repeater 4 is connected to the data display device 3 via a host network 1 of the ring (loop) type, a CPU 9a applies data transfer control with the data display device via a host interface section 7, a CPU 9b applies data transfer control with each controller via a subordinate interface section 8 and the correspondence between the CPUs 9a, 9b is attained via a shared memory 6. The display device collects always the up-to-data data by reading the data in a data storage area of the shared memory 6 via the host interface section of the data repeater 4 again when the data from the control is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hierarchical distributed control system that centrally monitors a plurality of process control devices distributed in individual networks using a data display device.

[Conventional technology]

FIG. 2 is a configuration diagram showing a general example of a hierarchical distributed control system, where l is an upper network, 2 is a lower network, 3 is a display device, 4 is a data repeater, 5a, 5b, 5C
is a control device (controller).

That is, in the field of process control, distributed control systems have recently been increasingly used, and these systems connect independent MI'I& process control devices (controllers) through networks such as loops or paths.
This system aims to decentralize control and centralize information by centrally monitoring controllers distributed on a network using data display devices.

Furthermore, as the scale of the plant increases, a hierarchical distributed control system as shown in FIG. Large-scale decentralization of control by coupling to the upper network 1 via.

I am trying to specify the information.

[N points while the invention is trying to solve]

In such a hierarchically decentralized control system, the data display device 3 displays data and sets data regarding the controllers 5a, 5b, and 5C connected to the lower network 2, but the display is not used for plant monitoring. Data needs to be refreshed quickly. However, in the system shown in FIG. 2, there are two networks 1.2, so in order to read data from the controller 5aO, for example, display device 3 → network 1 → data relay 4
→Network 2 → Controller 5a → Network 2
→ Data repeater 4 → Network 1 → Display device 3 needs to be transmitted, which takes time. Also, when displaying data from multiple controllers at the same time, it takes as much time as the number of controllers. There is a problem with putting it away.

Therefore, it is an object of the present invention to solve these problems by enabling faster data refresh in a display device.

[Means for solving problems]

A data repeater that connects networks is composed of an upper control section that controls the interface with the upper network, a lower control section that also controls the interface with the lower network, and a shared memory shared by these K.

[Effect]

The above-mentioned higher level based on the command from the data display device.

The screen can be refreshed at high speed by collecting data to be displayed in a shared memory while updating it at a predetermined cycle under the control of a lower control unit.

〔Example〕

Figure 1 is a configuration diagram showing an embodiment of this invention, Figure 1 is a schematic diagram showing a system configuration to which this invention is applied, Figure 1B
The figure is a schematic diagram for explaining a data collection method using a shared memory, and FIG. 1C is a reference diagram for explaining setting items in the setting area.

That is, FIG. 1 shows a specific example of a data repeater for connecting networks, which includes a shared memory 6, an upper interface section 7, a lower interface section 8, and a data processing section (CPU) 9a.

9b, ROM (read-only mail) 10a.

10b and R, AM (random access memory) 11
It consists of a, llb, etc. Moreover, as shown in FIG. 1A, this data repeater 4 and controller 5a
, 5b, .
It is connected to a data display device 3 via a higher-level network 1 of the formula.

Therefore, the CPU 9a in FIG. 1 controls data transfer with the data display device 3 via the upper interface section 7, and the CPU 9b similarly controls the transfer of data to and from the data display device 3 via the upper interface section 7. ! Controller 5a via i5B.

5b...5h, and communication between these CPUs 9a and 9b is mainly performed via the shared memory 6.

As shown in FIG. 1B, the shared memory 6 consists of a data setting area 13 from the display device 3 and a data collection area 14 of the controller, and various information regarding data to be displayed from the data display device 3 is stored in this setting area 13. 6, data corresponding to the request from the data display device 3 is automatically collected from each controller via the CPU 9b of the data relay device 4. That is, the display device 3 displays the first
Controller number 15a, data address 1 as shown in Figure C
When a predetermined number of blocks of information such as 5b and data length 15c are written to the setting area 13 of the shared memory 6 via the host interface 7, the CPU 9b constantly monitors this area, so the data settings are CPU when executed
9b immediately starts collecting data from the designated controller via the lower interface section 8, and stores the collected data in the data storage area 14. By performing this data collection at a predetermined cycle until the setting data is changed, the data in the data storage area will always be refreshed nine times. It goes without saying that if the setting data is changed, data collection corresponding to the change is repeated at a predetermined cycle.

In this way, when the data display device 3 is displaying data from the controller, the data in the data storage area 14 is read again via the upper ink face section 7 of the data relay device 4, so that the data is always up-to-date. data can be collected. At this time, the transmission that the display device 3 performs when refreshing the screen is as follows: display device 3 → upper network 1 → data relay 4 → upper network 1 → display device 3
Since data from multiple controllers can be read at once, it is possible to refresh the screen faster.

〔Effect of the invention〕

According to this invention, the data corresponding to the screen of the display device can be automatically collected by the data repeater.
This provides the advantage that the data collection time of the display device can be significantly shortened and screen refresh speed can be increased.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of this invention, FIG. 1A is a schematic diagram showing a system configuration to which this invention is applied, and FIG. 1B is a schematic diagram showing a system configuration to which this invention is applied.
The figure is a schematic diagram to explain the data collection method using shared memory, Figure 1C is a reference diagram to explain the setting items in the setting area, and Figure 2 shows a general example of a layered distributed control system. FIG. Code explanation 1... Upper network, 2... Lower network, 3... Data display device, 4...
...Data repeater, 5a, 5b, 5c...
Control device (controller), 6...Shared memory, 7...Upper interface, 8...
・Lower interface section, 9a, 9b... Data processing section (CPU), 10a, 10b...-40M (
+7-only memory), lla, llb...
RAM (random access memory), 12a to 12C
--------Display data, 13 (13a to 13c)・
... Setting area, 14 (14a to 14c) ...
...Data storage area, 15a...Song controller number,
15b...Data address, 15C...
·Data length. 1 g Tee-9, each track 1+ bar
, wIB diagram IC diagram

Claims (1)

[Claims] In a layered distributed control system that centrally monitors multiple process control devices distributed in individual networks using data display devices, the upper control unit controls the interface with the upper network and the interface with the lower network. A data repeater is provided that connects the networks, and includes a lower control unit and a shared memory shared by the upper and lower control units, and controls the upper and lower control units based on commands from the data display device. A hierarchical distributed control system characterized in that data to be displayed is collected in the shared memory while being updated at a predetermined period.