JPS60247723A - How to control building management system - Google Patents

Abstract

PURPOSE:To allow a system which controls, monitors, and records various facilities in a building to control processing after power recovery excellently by detecting a power failure time and selecting or changing the process after the power recovery. CONSTITUTION:When the power failure of a power unit AVR is detected, that is reported to a CPU and current time T1 is read out of a timer CLK according to the program stored in a memory ROM and stored in a memory RAM. A pulse counted value M and the time T1 which are stored previously are held continuously by a storage battery BAT during the power failure. when the system recovers from the power failure a certain time later, the CPU reads current time T2 out of the timer CLK and compares it with the time T1. Then when it is judged that the power failure lasts for the short time and there is no problem to the system, the counting operation is continued without initializing the counted value M. If it is judged that the power failure continues for a long time and there is a problem, the counted value M is initialized and pulses are counted from the beginning. Thus, the processing after power recovery is performed properly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a building management system, and particularly to a suitable control method during power outage and restoration.

[Background of the invention]

In conventional systems, when the power is restored after a power outage, there are two methods: one method is to return to a blank page and start processing from the beginning immediately before the power outage, and the other is to memorize only the processing content up to just before the power outage (for example, when a non-volatile (using memory, etc.) Process from this state when power is restored? A method of restarting is being taken.

However, the former method has the problem that even if the power outage is short enough to not affect the entire system, the results processed just before the power outage are completely lost. etc. had the problem of performing processing that was completely unsuitable for the state after power was restored (a type of malfunction).

[Purpose of the invention]

An object of the present invention is to provide a control method that is good even during power failure and recovery.

[Summary of the invention]

The key point of the present invention is to decide what to do when the power is restored depending on the duration of the power outage. The point is that you can change the selection.

[Embodiments of the invention]

The following is the present invention Kebarusu data? A detailed explanation will be given using an example of counting.

gllil indicates the hardware configuration of the building management system. In the figure, AVR is a power supply device that supplies power to blocks B1 and B2 when the power is live. BAT is a storage battery, and even if the power supply AVR has a power outage, the device RAM of block B2,
Power is supplied only to CLK.

The CPU is a microcomputer, the ROM is a read-only memory that stores programs, and the RAM is a readable and writable memory that stores processed data.
Is there a clock, a signal line SiG, an input/output device that converts and imports signals transmitted from external equipment, and a BUS that converts data between the microcomputer CPU and each device? This is a pass line for transmission and control.

Normally, as shown in the flowchart of Fig. 2, the microcomputer CPU takes in pulse signal data sra* from the input/output device iQ according to a program stored in the memory ROM, and stores it in the memory RAM in the order of (call) M+1-ML. What to do t periodically 〈υchange.

Now, when a power failure of the power supply device AVR is detected, this is transmitted to the microcomputer CPU, and as shown in the flowchart of Fig. 3, the current time Tlk is read from the clock CLK according to the program stored in the memory, and the current time Tlk is read from the memory ROM. Store inside. (It is assumed that there is sufficient processing time after the power failure sound of the power supply A'VR is detected until the power supply to the microcomputer actually stops.) During the power failure, the pulse count is stored in advance by the storage battery BAT. The value M and time T1 are continuously held.

Next, when the power is restored after a certain period of time, as shown in the flowchart of the microcomputer CPUH1fI4c14, the current time T2 is read from the clock CLK according to the program stored in the memory ROM, and the time stored just before the power outage is read. Compare with T1. As a result, if it is determined that there is no problem with the system due to a short power outage,
The previously stored pulse count value M is not initialized, but continues to be counted based on the flowchart of FIG. However, if it is determined that there is a problem with the system due to a long power outage, the previously stored pulse value M should be initialized (for example, zero clear O-
+M), start counting again from the beginning (according to Figure 2).

〔Effect of the invention〕

According to the present invention, it is possible to automatically determine whether to continue processing, initial clear, etc., depending on the length of the power outage time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the building management system of the present invention, and FIGS. 2 to 4 are flowcharts of the present invention. AVR...Power supply device. Agent Patent Attorney Akio Takahashi

Claims (1)

[Claims] 1. A building management system for controlling, monitoring, and recording the sounds of various equipment in a building, which is characterized by detecting power outage time and selecting and changing processing after power restoration. How to control the management system.