JPS5822469A - Central monitoring controller - Google Patents

Abstract

PURPOSE:To simplify a system and to prevent malfunction due to outer disturbance by decentralizing processing to plural CPUs, and allowing the CPUs to monitor their faults mutually. CONSTITUTION:In a building control system 1, various kinds of control processing necessary for control over building facilities are allotted to CPU boards 3, 5, 7, and 9. If disturbance occurs to one position in this sytem 1 to cause the runaway of one of the CPUs of the CPU boards 3, 5, 7, and 9 or to be an abnormal state, the diagnosing devices of the remaining CPU board in normal operation detect the matching of indication data. The CPU board in the faulty state is restarted to continue the control over the building facilities.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a central monitoring and control device in which signals from a terminal device are processed in a distributed manner by a plurality of central processing units (CPUs) to improve reliability.

ζOIA Akihiro, 41 can be applied to building equipment or plants in building control systems such as electric power, air conditioning, and disaster prevention.

Hereinafter, a case where the present invention is applied to a building control system will be explained as an example.

As a central monitoring and control device for a conventional building control system,
Since the system was centrally controlled by a single central processing unit (CPU), the following problems occurred.

(a) An abnormality that occurs at one location in the system
It can affect the entire building control system and cause a major accident.

佽) The system becomes more complex, requiring a huge amount of time to design software and hardware, and lacks design stability.

(e) System expansion or maintenance becomes difficult.

The present invention has been made in view of the above, and its purpose is to provide a highly reliable central monitoring and control device. In order to achieve the above object, a plurality of central processing units (CPUs) input signals from a plurality of terminal devices and perform processing to control the terminal devices in a distributed manner.
and a storage device shared by the central processing unit, and a plurality of diagnostic devices in which the central processing unit mutually detects malfunctions in other central processing units and restarts them. do.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a building control system 1 using a microcomputer embodying the present invention, which mainly includes a CPU board 3 and La for simple control, a CPU board 5 for applied control, and a one-man machine. A terminal device is composed of a CPU board 7 for data storage, a CPU board 9 for data storage, and a shared storage device (memory) 11 that can be accessed by each of the CPU boards 3, 5, 7.9 via an external bus lla. Input/output (110) board 13, 13,・
It consists of...etc.

Each of the above CPU boards 3t 3at 5, 7t 9
have almost the same configuration. For example, to explain the CPU board 9 shown in FIG. 2, the central processing unit (C
PU) 15, diagnostic device 17 (excluding CPU board 3a), internal memory 19, and peripheral interface circuit 2.
It has 3.

The diagnostic device 17 includes a storage device 25 that stores diagnostic data for diagnosing other CPUs, as shown in FIG.
A comparison device 27 that compares the data 251 from the storage device 25 and the data 11m from the previous WA storage device 11; and a restart signal 29m to other CPHs in response to a command 27m from the comparison device 27; 29b and 29c, and the restart signal transmitting device 29 interrupts the CPU in the abnormal state and performs appropriate abnormality post-processing, and then returns to the initial state. This is to restart the CPU.

Note that the internal memory 19 stores unique programs corresponding to the processing performed by each CPU 0, and is useful for controlling building equipment! ! Each processing program is divided.

Next, the operation of this embodiment will be explained by referring to the CPU boards 3.5 and 7.
．． 9 will be explained together with peripheral devices.

An input/output board 13 that performs A/D conversion, serial/parallel conversion, etc. is connected to the peripheral interface circuit of the CPU port 30 for simple control via a transmission line 31. is essential for controlling building equipment! ! Various power sensors and a drive circuit for driving and controlling building equipment are connected, and the CPU board 3 for simple control operates according to various input information such as temperature and a control schedule to be described later. It drives and controls building equipment as appropriate.

Note that the CPU board 3a provided between the simple control CPU board 3 and the transmission line 31 has almost the same configuration and function as the CPU board 3, and has a buffer for the transmission line 31 and a display 33. The contents of the control are displayed by .

The applied control CPU board 5 is the simple control CPU board 5.
Instead of the U-board, it performs advanced control, such as optimal control for controlling building equipment while determining optimal control conditions according to input information.

The CPU board 7 for man-kun is connected to a keyboard 35, a display 37 . It is a tortoise that controls the printer 39, etc., and the operator gives instructions to the building control system 1 from the keyboard 35, so when the operator inputs an instruction from the keyboard 35, the building equipment is controlled based on the operator's instruction. Once the schedule has been edited,
Clothes '@, stored in the ¥ storage device 11 and transferred to other CPU boards 3
．． 5.9 is configured to operate according to the above control schedule. The display 33 and printer 39 are used to monitor instructions from the operator and to display or print various information.

The database CPU board 9 controls a disk device 41 as an external auxiliary storage device. This is to compensate for the small storage capacity and volatility of the table error storage device 11, which is composed of an RM (Random Access Memory). Various program files, management data files, etc. necessary for the building control system are stored therein, and are accessed from other CPU boards as appropriate and necessary.

As described above, the building control system 1 uses the four CPU boards 3 and 5 to perform various control processes necessary for controlling building equipment.
, 7, and 9 share the processing duties.

In addition, in the building control system I configured as described above, if a disturbance occurs at one location within the system, the CPU board 3
,5. If one of the 9 CPUs goes out of control or goes into an abnormal state, the data indicating the status of the CPU d/- board in the external storage device and the instruction data to other CPU boards will be lost, but it will continue to operate normally. The diagnostic device for the CPU board in use will detect the consistency of the above data, restart the CPU board in the abnormal state, and continue controlling the building equipment.

Therefore, according to this embodiment, processing in building control is distributed among a plurality of central processing units (CPUs), and the complexity of software in each central processing unit is reduced. Since mutual monitoring of abnormalities is carried out, it is possible to simplify the system and prevent malfunctions due to disturbances.

Since the present invention is configured according to the scope of the claims, it is possible to improve the reliability of the central monitoring and control device.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but may be implemented in a plant or the like by making appropriate changes.

[Brief explanation of the drawing]

Fig. 1 is an embodiment of a building control system implementing this invention, Fig. 2 is a block diagram of the CPU board in Fig. 1,
FIG. 3 is a block diagram of the diagnostic device in FIG. 2. (Explanation of symbols representing main parts)

Claims (2)

[Claims] (1) Multiple O central 6 that inputs signals from multiple terminal devices and performs distributed processing for controlling the terminal devices.
m11I (CPU), a storage device shared by the central processing unit, and a mutual K110 central processing unit.
1. A central monitoring and control device comprising a plurality of diagnostic devices for detecting malfunction of a scissor holder and restarting the scissors. (2) The central monitoring and control device according to claim 1, wherein the terminal device is a terminal device of a building control system.