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At present, China's elevator group control system has been widely used, but the remote monitoring of group-controlled elevators has yet to be researched and developed. Therefore, the remote monitoring of group-controlled elevators is more practical and more representative of the humanized service of contemporary society.
First, the elevator monitoring system overview
The current classification of elevator monitoring systems:
1. At present, most elevator companies at home and abroad have their own monitoring systems, but such monitoring systems are only developed for their respective brands. The various systems are incompatible with each other and are subject to many restrictions in their applications.
2. Network communication monitoring with PLC. PLC can easily form a system. The development of such a system completely eliminates the cost of hardware development. As long as the software development is mature, the installation can be started, and the system generally adopts a standard communication interface, which easily forms a network with other intelligent devices of the building. But the cost is higher. But as the price of PLC drops, it is also a good way.
3. Using a single-chip microcomputer to form an independent sampling communication unit to form a secondary monitoring system. The initial development cost (including hardware and software) of this type of monitoring is high, but after the system is formed, the cost of resale is very low. However, due to the small market, it is difficult to form a scale, and the system does not use standard accessories, and it is difficult to maintain in the future. It can be seen that the above methods are not an ideal form.
Second, the elevator monitoring system design
(1) The structure and principle of the elevator monitoring system
The structure of the elevator operation monitoring system is shown in Figure 1. It mainly includes a central dispatching unit, an acquisition unit, a transmission bus and a field controller. The utility model is characterized in that: 1 the central dispatching unit is responsible for realizing the group control function of the elevator (by learning, using and acquiring the experience knowledge, that is, the self-learning of the system, and then adopting a certain deployment strategy according to the current state information of each elevator, Using an algorithm to analyze which elevator responds to the call will give the elevator system the best performance, and then assign this signal to the corresponding controller); 2 data acquisition unit is mainly responsible for the collection of elevator state information; 3 bus for central scheduling Unit and acquisition unit and remotely monitored data transmission.
The focus here is on the communication between the elevator system and the monitoring center, as well as the specific implementation of the monitoring system in the upper computer. The remote monitoring of the elevator system is generally realized in the Building Automation System (BAS). Of course, it can also be integrated with the Building Management System (BAS) for remote monitoring through the interface provided by the elevator system.
What kind of communication between the elevator controller and the BA system is the key to realize remote monitoring. The elevator system provides RS232 or RS485 interface, etc., directly to the monitoring center, it will be limited by RS232 or RS485 transmission distance, although RS485 to TCP is realized through the conversion module. /IP conversion can realize long-distance transmission, but when there are many elevators, especially when the distance between the buildings is far away, the wire will be wasted. Therefore, the advantages of each dispatching machine before networking and then to the monitoring center are particularly prominent, such as Figure 2 and Figure 3. Of course, in this case, the data transmission can be carried out by means of the optical fiber of the integrated line. The weak electric system borrows the fiber of the integrated wiring, and it will also be a development direction of the weak building system of the intelligent building.
(II) Realization of remote monitoring in the upper computer
Remote monitoring of the elevator can be achieved by writing simple program code via Vb or Vc. In VB6O, use MSC0mm for communication programming, make necessary settings for the CommPort, Setting, Portopen, InBufferCount, and InputLen attributes of the control, receive the information transmitted by the elevator, and then obtain the required information through decoding. However, when using the MSC0mm control to receive data, the number of monitoring elevators is limited due to the limited number of COM ports. Only 8 monitors can be monitored. It is not easy to use when monitoring multiple elevators; up to 256 can be monitored by using Winsock control components. Elevator, therefore, it is best to use the Winsock control when monitoring multiple elevators.
According to the characteristics of the interface protocol of the elevator (Guangzhou Hitachi Elevator) used by a certain building group in Shenzhen, when the data of the elevator needs to be obtained, the elevator should be called first, and the elevator will send the data after receiving the calling information. Call the call directly using the Sendoata function of the Winsock control to retrieve data using the OataArrlval event. Open the Winsock connection as follows:
tcpclientRomoteHost=19216802 "Data can be read from the system's database.
TcpclientRemotePort=4010
TcpclientConnect
Use the control function Getoata to get the elevator data and put it into strTemp:
Private Sub tcpclient_DataArrival (ByVal bytestTotal As Long) Dim strTemp () As Byte
Tcpclient GetData strTemp
StrCat ReceiveBuffer, strTemp "StrCat function connects Byte type data.
RefreshDisplay strTemp "RefreshDisplay is a decoding function. The decoding function can determine the information represented by the corresponding bit to obtain the correct elevator data.
End Sub
Since the real-time data of the elevator is obtained, the call control data can be sent at appropriate intervals using the clock control in the VB6O to update the monitoring data in time. By using Vb, Vc and other tools to create a beautiful interface, and then write the corresponding interface program, you can communicate with well-known integrated systems such as Honeywell, Siemens and Jonhnson Controls to achieve system integration. Taking into account the stability and openness of the system, we use Moxa card OE311 to realize the conversion of data information to Ethernet. The interface of each elevator adopts an OE311, and the data information of RS485 or RS232 is transmitted to the Ethernet, and the elevator management program is used. Unified monitoring of multiple elevators. The system is equipped with a dedicated elevator management workstation, and uses the monitoring program to uniformly manage the data of multiple elevators and open it to the integration server in the OPC server mode. On the integrated system server, the elevator is monitored in real time through the OpC client program and graphically displayed on the integrated platform.
Third, the system optimization
In the future, elevator monitoring will develop in the direction of humanization and comfort, so the system wireless remote control is realized. (When the elevator fails, the elevator can send fault information to the mobile phone through the wireless device, and send a signal to the elevator to control the elevator easily. To make the system more humane) is even more important; of course, passenger identification system, fingerprint identification system, digital intelligent security control technology (rejecting outsiders through passenger identification system or IC card and digital monitoring equipment) can be used. Make the system provide safer and more comfortable services to humans.
Fourth, the conclusion
First of all, the signal acquisition unit of elevator operation monitoring is completely isolated from the original elevator system by photoelectric isolation. Secondly, the device uses a large number of integrated circuits and advanced printed circuit board technology and the world's most advanced SCM. The production process makes the reliability of the elevator effectively ensured, and it is convenient to monitor the operation of the elevator in real time and help the maintenance personnel to eliminate the elevator failure in time.
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