KR100333267B1 - Building automation system - Google Patents

Abstract

The present invention includes a plurality of functional modules installed in the building to facilitate the convenience of those who perform work or live; A host for displaying an operation state of the function module installed in the building and executing a control command with the function module; A main CPU module for automatically controlling the function module according to a set value input by a manager of a building; Detects whether the main CPU module has a failure, and if a failure occurs in the main CPU module, the function is performed. When the main CPU module returns to a normal state, the control right is transferred to the main CPU module, and the main CPU module is monitored. A sub CPU module that performs a function; A building automatic control network configured to perform a network communication between the host and the main CPU module and a sub CPU module by a cable and an interface, and a serial port configured by the cable and interface to perform serial communication between the main CPU module and a sub CPU module. The present invention relates to a building automation system including a communication device, and it is possible to stably operate a building management because various devices can be normally controlled even if an abnormality occurs in the main CPU module due to an unexpected failure.

Description

Building Automation System {BUILDING AUTOMATION SYSTEM}

The present invention relates to an automation system, and more particularly, to a building automation system to perform a normal function even if a failure occurs in the main CPU module for controlling various devices of the building.

In general, the building is equipped with mechanical and electrical devices for performing various functions in order to provide a variety of convenience to people living in the building or working in a certain industry. Some of these devices do not require control, while others require electrical control.

Hereinafter, a general building automation system will be described with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a connection configuration of a general building automation system, in which a host 10 for appropriately controlling various devices installed in a building is installed, and the host 10 is a first bus that is a cable for a building automation network. Is connected to (L1). At this time, the host 10 is a personal computer (PC) or workstation (Workstation) is used, but PC is preferred because of low cost and excellent compatibility.

The first bus L1 is also connected to one end of the CPU module 12 for appropriately controlling various devices in the building, and the second bus L2 for serial communication is connected to the other end of the CPU module 12. It is. In this case, the second bus L2 is an asynchronous serial communication bus using an RS-485 chip.

The second bus L2 is connected with first to nth function modules 14a-14d for convenience of people living in a building or engaged in a specific task. At this time, the first to n-th functional module (14a-14d) can be connected to a variety of devices, for example, an air conditioner for purifying the air in the building to a predetermined state, for raising the temperature in the building to a predetermined state There are boilers, light switches to properly light or turn off lighting devices in buildings, and elevators to vertically move people into different floors in a building.

Referring to the detailed function and configuration of the building automation system having the configuration as described above are as follows.

As described above, the host 10 mainly uses a PC composed of a main body and a monitor, and provides a localized graphical user interface to easily monitor and manage the operation status of various devices installed in the building. At this time, it is possible to know the operation state of the various devices in the building, and to have software for controlling the various devices appropriately.

In addition, the first bus L1 is a building automatic control network that can control communication with a host and a CPU module.

In addition, the second bus L2 uses a serial communication RS-485 method, which has a transmission distance similar to that of RS-422, and communicates with a differential signal of a single power supply of 5V. The main difference from RS-232C or RS-422 is that it uses half-duplex communication method, and one-to-many communication is possible. And, up to 32 devices can be connected on one transmission line.

In addition, the first to n-th functional module (14a-14d) is a variety of devices for the convenience of people living in the building or in a particular industry, such as air conditioners, boilers, elevators as described above, these devices are mechanical devices It may be installed to occupy a predetermined space, or may be distributed and installed in a building. In this case, the first to n-th functional modules 14a-14d are electronic devices having a mechanical structure in order to perform a predetermined function according to a control command.

Since the configuration of the building automation system has various forms depending on the structure of the building, for example, the operation will be described as follows. That is, the host 10 is a PC of which the CPU is an Intel Pentium processor, the first function module 14a is an air conditioner, the second function module 14b is a boiler, and the third function module 14c is an elevator. define.

First, the manager of the building looks at the graphic data displayed on the monitor of the PC, which is the host 10, the air conditioner as the first function module 14a, the boiler as the second function module 14b, and the third function module ( 14c) The operation state of the elevator and the presence or absence of abnormality are grasped.

However, operations required to perform the functions of the first to nth function modules are performed by the CPU module, and the results calculated by the CPU module are displayed on the monitor of the host.

On the other hand, if another computer is connected to the Ethernet LAN, it is also possible to perform data communication with other computers via the Ethernet LAN and the first bus (L1), it is possible to communicate and control using the Internet. The second bus L2 for serial communication is also connected to a plurality of devices to enable data communication and control.

However, the conventional building automation system as described above is unable to perform its own function when the CPU module is shut down, so that the manager of the building must bear the time, human, and material loss occurring during the manual recovery of the system. There is this.

An object of the present invention for overcoming the problems described above is to provide a building automation system for operating the system normally even if the main CPU module for controlling various devices in the building fails.

1 is a block diagram showing a connection configuration of a general building automation system.

2 is a block diagram showing a connection configuration of the building automation system according to an embodiment of the present invention.

3 is a state diagram illustrating a step of solving a problem occurring when a failure of a main CPU module and a sub CPU module of a building automation system according to an embodiment of the present invention.

4 is a block diagram showing the functional configuration of the main CPU module of the building automation system according to an embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

10; Host 12a; Main CPU module

12b; Secondary CPU module 14a; 1st function module

14b; Second functional module 14c; 3rd function module

14d; Nth control module L1; First bus

L2; Second bus S1; First state

S2; Second state S3; Third state

S4; 4th state

In order to achieve the object of the present invention, the building automation system of the present invention includes: a plurality of functional modules installed in a building to facilitate the convenience of those who perform tasks or reside; A host for displaying an operation state of the function module installed in the building and executing a control command with the function module; A main CPU module for automatically controlling the function module according to a set value input by a manager of a building; Detects whether the main CPU module has a failure, and if a failure occurs in the main CPU module, the function is performed. When the main CPU module returns to a normal state, the control right is transferred to the main CPU module, and the main CPU module is monitored. A sub CPU module that performs a function; A building automatic control network device comprising a cable and an interface configured to perform network communication between the host, the main CPU module, and the sub CPU module; And a building automation system including a serial communication device configured with a cable and an interface to perform serial communication between the main CPU module and the sub CPU module.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a block diagram showing the connection configuration of the building automation system according to an embodiment of the present invention, a host 10 comprising a computer main body and a monitor is installed, the host 10 is a cable for building automatic control network ( It is connected to the main CPU module 12a and the sub CPU module 12b via L1), respectively. Further, the main CPU module 12a and the sub CPU module 12b are connected to the first function module 14a and the nth function module 14n, respectively.

The function of the building automation system configured as described above is as follows.

Since the host 10 detects an abnormality of various devices installed in the building, the manager of the building detects the abnormality of the devices by reporting the operation status of the devices displayed on the monitor of the host 10. At this time, if an abnormality is found in a specific device of the building, the administrator performs a predetermined action, that is, repairing the corresponding device, so that the system can operate normally.

In addition, the main CPU module 12a performs a function of controlling the first to nth function modules 14a-14n by the information input by the manager of the building through the host 10, and the sub CPU module 12b. When the failure of the main CPU module 12a is detected, the main CPU module 12a performs a function.

In addition, the first to n-th functional modules 14a to 14d are electronic devices for properly operating a building, for example, a parking lot ventilator for ventilating the air in the parking lot, and maintaining the inside of the building at a predetermined temperature or more. Boilers, elevators that vertically elevate people to specific floors.

However, as described above, the first to nth functional modules may be installed in various types of devices according to the size of the building, and may vary.

On the other hand, the data communication in the system having the above configuration will be described as follows.

The host, the main CPU module and the sub CPU module are connected by a cable for a building automatic control network, and the main CPU module and the sub CPU module and the first through n-th functional modules are connected by a serial communication cable.

In addition, serial communication using an RS-485 chip is performed between the main CPU module 12a and the first functional module 14a.

When the main CPU module 12a transmits data to the first function module 14a, the first function module 14a first transmits the ASCII code value '0xFx' to the first function module 14a. Ask if you are ready to receive it. If it is not ready to receive data, the first functional module 14a transmits '0x04', and if it is ready to receive data, it transmits '0xFx'.

On the contrary, when the first function module 14a transmits data to the main CPU module 12a, the main CPU module 12a transmits an ASCII code value of '0xEx' to the first function module 14a. Ask whether there is currently data to send. If there is no data to transmit, the first function module 14a transmits '0x04', and if there is data to transmit, '0xEx'. Receiving '0x04', the main CPU module 12a recognizes that there is no data to be sent by the first function module 14a, and sends a signal indicating that it has also received the sent data by sending '0x04'.

Here, in addition to the above, serial ASCII codes are used in serial communication, which is also called a control character.

However, the sub CPU module 12b detects a control character transmitted and received during serial communication between the main CPU module 12a and the first to n th functional modules 14a, 14b, 14c, and 14n. To detect whether the main CPU module 12a is in a shutdown state.

That is, between the main CPU module 12a and the first to n-th functional modules 14a, 14b, 14c, and 14n, a control character is transmitted and received at a cycle of 100 ms. If it is not transmitted or received after that, the secondary CPU module 12b determines that the main CPU module 12a is in the shutdown state.

On the other hand, the generation conditions and the processing method according to the above-mentioned whether or not the main CPU module and the secondary CPU module as described above are as follows.

3 is a state diagram according to whether there is an abnormality of a main CPU module and a sub CPU module of a building automation system according to an exemplary embodiment of the present invention. The first state S1 includes a main CPU module 12a and a sub CPU module 12b. Normal operation. In addition, in the second state S2, the main CPU module 12a operates normally, the sub CPU module 12b is in a failure state, and in the third state S3, the failure in the main CPU module 12a is caused. In this state, the sub CPU module 12b is in a normal operation state. The fourth state S4 is a state in which a failure occurs in both the main CPU module 12a and the sub CPU module 12b.

As the first step (1), when the main CPU module and the sub-CPU module are both started simultaneously and the main CPU module and the sub-CPU module are powered on in the power-off state, The state transition to the first state causes the main CPU module and the sub CPU module to be in a normal state.

As the second step (2), in the case where the main CPU module periodically checks '0xFx', '0xEx', which are query characters used for serial communication, the main CPU module and the sub CPU module maintain the first state. Maintain steady state.

In the third step (3), when the main CPU module and the sub CPU module are shut down at the same time or the power is turned off, the main CPU module and the sub CPU module are both shut down in the transition from the first state to the fourth state. do.

In the fourth step 4, when an error occurs in the main CPU module or stops to debug the main CPU module, the state transitions from the first state to the third state and an error occurs in the main CPU module. The secondary CPU module is in a normal operating state.

As the fifth step 5, when the main CPU module operates normally and when the main CPU module is reset and then restarted, the main CPU module and the sub CPU module are both shifted from the third state to the first state. Normal operation.

Here, if the main CPU module has an error and the sub CPU module takes over the function, and the main CPU module restarts again, a communication error occurs in local communication. If this error occurs above average, the secondary CPU module recognizes that the main CPU module has been restarted, transfers system management to the main CPU module, and continues to monitor the status of the main CPU module.

As the sixth step 6, when an error occurs in the main CPU module or stops to debug the main CPU module, the state shifts from the first state to the second state and the main CPU module operates normally. An error has occurred.

As the seventh step 7, when the main CPU module operates normally or resets and then resumes operation, the state shifts from the second state to the first state, where both the main CPU module and the sub CPU module operate normally.

As the eighth step 8, when the power is turned on in a state where there is no main CPU module, the state transitions from the fourth state to the third state, an error occurs in the main CPU module, and the sub CPU module is in a normal operation state. .

In the ninth step 9, when the power source is turned off in the absence of the main CPU module, the state transitions from the third state to the fourth state and an error has occurred in both the main CPU module and the sub CPU module.

The detailed configuration of the CPU module as described above is as follows.

4 is a block diagram showing the detailed configuration of the main CPU module connected to the building automation system according to an embodiment of the present invention, the CPU 10 for performing the calculation and logic is installed, the CPU 10 A clock generator 12 for generating a clock frequency is connected. In addition, a local bus is connected to the CPU 10, and a node memory 14, a first memory 16 and a second memory 18, which store a node address, is connected to the bus. The backup memory 20, which functions as an auxiliary power supply, is connected to the two memories 18. The local bus is connected with a serial communication chip 22 for performing serial communication, a bus controller 24 for controlling the bus, and a status display LED 26 for displaying the status of the device.

In addition, the serial communication chip 22 is connected to a serial communication interface 28, which is a connection device provided for serial communication, and the first and second bus interfaces 30a and 30b are connected to each other. . At this time, the serial communication chip 22 and the bus controller 24 are independently connected.

As described above, even if a failure occurs in the main CPU module by providing a secondary CPU module that can detect whether there is a failure, it is possible to stably operate the building automation system.

According to the embodiment of the present invention as described above, even if an abnormality occurs in the main CPU module due to an unexpected failure, it is possible to control various devices normally, so that there is an advantage of stably operating building management.

Claims (1)

A plurality of function modules installed in the building and performing a predetermined function according to a control command; A host for displaying an operation state of the function module and having input means for changing a setting value of the function module from a building manager, and outputting a control command according to the input setting value; A main CPU module for automatically controlling the function module according to a set value transmitted from the host; Detects whether or not a failure occurs in the main CPU by detecting control characters transmitted and received between the main CPU module and the plurality of function modules, and performs a function when a failure occurs in the main CPU module. After recovery, the control unit is transferred to the main CPU module, and the sub CPU module performing the monitoring function of the main CPU module; A building automatic control network device configured with a cable and an interface to perform network communication between the host and the main CPU module and the sub CPU module; And a serial communication device comprising a cable and an interface to perform serial communication between the main CPU module and the sub CPU module.