The Research And Design Of Intelligent Building Monitoring System Based On Industrial Ethernet

Intelligent building is the new concept building developed in the near three decades. Its green, high degree of automation has been widely accepted and supported worldwide. Building comprehensive monitoring system is the core of the intelligent building. It covers power system, air-conditioning system, chiller system, water supply and drainage system, lighting system, fire alarm system and so on. It combines all monitoring subsystems into a comprehensive monitoring system. It achieves decentralized control and centralized management. It designs Dalian Technology Computer Control Engineering Co., Ltd building comprehensive monitoring system through computer technology and network technology based on the basic concept of intelligent building.Comprehensive monitoring system is based on the industrial Ethernet, and it uses network controller PEC8000 as collect and control module which supports EPA communication protocol. Comprehensive monitoring system consists of six main parts:video monitoring, power monitoring, lighting control, elevator monitoring, electric door control, production line monitoring. Video monitoring system includes three parts:PTZ monitoring, building monitoring, and outdoor monitoring. It accesses all cameras to the DVRs, and transmit video data to the monitoring center through Gigabit Ethernet。It embeds video controls into human-interface and displays the real-time monitoring images. It connects PTZ and PLC by RS485 interface, edits free communication program based on PTZ control protocol, and achieves perspective control and focus control from PLC to PTZ. Power monitoring system collects current and voltage of 63 circuits through current transformer and voltage transformer. It designs conditioning circuit which samples, amplifies, rectifies and filters multiple current, voltage, and phase signals. It converts current, voltage and phase signal to 0-5V standard signal and transfers into PLC and calculates current, voltage, power factor, active power, reactive power and apparent power. Lighting control system installs PLC in all 18 distribution rooms. PLC outputs on and off signals, controls AC contactor's by relay, and then controls the lighting circuit. Elevator monitoring system connects the elevator control module to PLC through the RS485 interface. In the elevator monitoring system, the elevator communication module is connected to the PLC via RS485 port. Elevator condition monitoring software is developed according to the elevator control protocol. Electric door control system uses three relays as the channel switch, and PLC gives control signal to switch three status of open, close, and stop. Production line monitoring system includes print machine, placement machine, reflow machine, wave soldering machine, air compressor machine, exhaust fan machine. It achieves directly all the main monitoring parameters of the machines via PLC, and sends to the monitoring center via Ethernet to achieve the remote monitoring of production line equipment. Human-interface is developed in the workstation and it achieves monitoring of six subsystems above.Finally, it gives the operation status of the comprehensive monitoring system including video monitoring and overall system operation, power system operation, production line operation. It lists power parameters in a number of time periods within a day, and analysis the change of electrical parameters.