【 Weak current College 】 LonWorks technology in xinjiapoguanlidaxue city IBMS system

Keywords: LonWorks technology, University City IBMS system functional requirements, application, energy-saving effect, the value of LonWorks open systems

Introduction to the LonWorks technology
At present, in almost every industrial application, there is a trend is away from proprietary control scheme and centralized system. Manufacturers, integrators and owners tend to use based on open technology products, such as out-of-the-chip and operating system and function module products. This technology can improve product reliability, increased system flexibility, built in reducing cost effectively improve system performance. LonWorks technology provides interoperability, advanced technology architecture and speed of product development and predictable cost savings, accelerates the development of this trend.
LonWorks technology is a common field bus technology in industrial control system can be used in the Sensor (sensor bus) Bus, Bus Device (device bus), Field Bus (field bus), and so any layer bus, to design, create, install, and maintain equipment, networks providing solutions to the many problems. In a LonWorks control networks, intelligent control devices (nodes) to use the same communication protocol and the other nodes in the network. Each node through built-in neuron chip to complete the agreement of the monitoring function. A LonWorks control networks can have two to 32385 or more nodes, you can implement features such as: sensors (temperature, pressure, etc), actuator function (switches, control valve, variable frequency drive, etc.), operation interface (display, man-machine interface, etc.) and control functions (air supply unit, VAV variable air volume, etc.). Because you do not need the traditional control systems in the central controller, LonWorks distributed control technology shows very high system reliability, fast system response speed and reduce system costs and maintenance costs. Neuron Chip finish node event handling, and through a variety of media to handle the result passed to other nodes on the network. LonTalk Protocol for LonWorks control networks to achieve interoperability. Neuron Chip and LonTalk Protocol is the core of LonWorks technology. At the same time through the i.LON products to achieve the LonWorks control networks and seamless connectivity of the Internet.

* Neuron Chip (Neuron Chip)

Use the neuron chip CMOSCLSI technology makes low-cost control network possible. Neuron Chip is a highly integrated, internal consists of three 8-bit CPU (central processing unit). The first CPU processor for media access, LonTalk Protocol of first and second floor; the second CPU processing for network processor, LonTalk protocol layer 3 through six layers, network variables handling, addressing, transaction processing, confirmed, background diagnostic, software, timer, network management and function path; the third CPU for application processor that performs user-written code and user code called by the operating system services. Neuron Chip for Neuron C programming language, it is derived from the ANSI C, and ANSI C for deletions and additions. Neuron Chip available through five communication pins and other nodes on the network to exchange information, you can also apply through 11 pins and field sensors and actuators to exchange information. 11 applying pin has 34 kinds of application operation mode that can be in different configurations as external offers flexible interface, and a timer for the chip inside the application.

* LonTalk Protocol

LonTalk Protocol provides a full suite of communication services, this makes your device applications to network with other device to send and receive messages without having to know the network topology, or a network of name, address, or other devices. LonWorks Protocol can optionally provide end-to-end (P2P) message confirmation, certified and priority of message to send to provide provisions restricted the number of transactions. To support network management service allows remote network management tools to network and interact with other devices, including network address and parameters of reconfiguration and download applications and report network problems and start/stop/reset device applications. LonTalk Protocol, and on the basis of the LonWorks systems can communicate on any physical medium, including the power line, twisted pair, radio (RF) and infrared (IR), coaxial and fibre, while supporting the bus, Star, free topology, topology type, and greatly facilitates the control of network construction.

* I.LON family of products

LonWorks control networks is building, industrial, household, transportation and public utilities automation applications for control and machinery manufacturing networking world-wide standards. Based on the data networking technology of the IP protocol is used on the Internet, local and wide area networks transmit data on the world wide standard. I.LON product will control and data network technology standards for seamless connections together.
I.LON products for everyday devices access to provide a reliable, secure Internet channel, these everyday devices include: lighting, household appliances, switch, temperature regulator, engine, meter, valves, etc. Within the jurisdiction of the license, through the Internet, to achieve full control to system, depending on the needs of monitoring, adjustment and reconfigure the device.

Xinjiapoguanlidaxue city IBMS system functional requirements and characteristics of

Xinjiapoguanlidaxue new University City is located in the city centre, Singapore mass urban centres transformation an important component in the plan, but also the first school in the regionGarden complex.
For normal commercial office buildings, no matter how large scale, its internal activities more or less has a fixed period of time, while the load is relatively fixed and University City is more complex and continuously changing. University City building location relative dispersion, with the students in the University City of activities, each building energy payload (especially the air conditioning and lighting) needs in every place, every single time point are constantly changing. Classroom, laboratory, Lecture Hall is being used every day. Therefore the school timetable, cannot like conventional commercial building as foreseen.
On the campus of energy consumption, air conditioning and lighting equipment for effective management and control is very important. In Singapore's climate, air conditioning and refrigeration cycle consumes energy is the energy consumption accounted for 60 per cent of the Bill. For campus buildings, these diverse and constantly changing load pattern of fine management, only based on the most advanced control technology for the intelligent control system. At the same university city construction is carried out in stages, with the ongoing construction of University City, the control system of the future of sustainable development is necessary to consider the issue.
Select the LonWorks technology to realize the IBMS system considerations
Select the LonWorks technology can take a number of manufacturers, Lonmark certified equipment and equipment integrated into a single intelligent building system to start the main building subsystems — security, lighting, elevators, HVAC, and other systems. By LonWorks smart router and network equipment into the open, seamless network that allows any point from network access to any device that can reduce system acquisition, operation and expansion, etc.
LonWorks technology can provide the entire system for seamless connectivity. In the building of internal, in any location across campus or across the globe, to pass through the network, the license rights to access the system.
Good interoperability guarantees the application of LonWorks technology means that the user is no longer any system or product of a single supplier. Using LonWorks device control system, many devices can use arbitrary topology that consists of a single twisted pair connection on a system providing for system construction, lower installation costs. Device and system control can be simplified by software update, to avoid the hardware, cables, conduit and wiring work, and then configure the significantly lower cost. Extension lines, access device, and then configure it through the man-machine interface. Topological approach is very flexible and can communicate in a variety of media, the Internet easier extended. Regardless of application, technology platforms and infrastructure is maintained. This means that the integrators and end user only needs to have a common set of tools can be effectively reduced maintenance and training costs. Based on the LonWorks device allows you to install all subsystems of a public communications infrastructure, elimination of redundant components, reducing duplication.

Xinjiapoguanlidaxue city IBMS system introduction

Because LonWorks technology foundation of good open, air conditioning and xinjiapoguanlidaxue city mechanical ventilation systems (ACMVS) in the design of different vendors of equipment designed for optimum results. Integrators at least ACVMS chose three different LonWorks device and successfully implements the system of control algorithms. This group of air-conditioning and ventilation systems (ACMVS) consists of two separate buildings of eight freezer, the total maximum cooling capacity reached 5550 tonnes, with more than 110 air conditioning unit, 1500 VAV controller, mechanical ventilation fans and fan-coil.
Applied to the control equipment ACMVS is the Matrix produced by the digital controller. The controller uses the free topology twisted-pair based on LonWorks transceiver with LonWorks technology, applications and other equipment to achieve end-to-end communications, ensure implementation feedback and adjustment required parameters, according to the fluctuations of the need to reduce the cooling load in real-time. For example, when a controller to switch to automatic status, if the load increases, the building of the freezer is initiated, if load necessary, automatically cut off the frozen opportunities. This type of intelligent control is the control based on LonWorks technology platform.
Another major area of energy conservation is to reduce lighting energy consumption. Hall, theaters, halls, etc. and lighting control are incorporated into electronic equipment management system (EFMS). Make an appointment with a set, you can use the time period of the room and the room lights only when someone enters the room is lit, when users leave or exceeds the allowable use of time, the lights are automatically turned off.
In addition to the mechanical ventilation system and electronic device management system, LonWorks system also implements the main line of electricity metering, household electricity metering, monitoring, on the fire automatic elevator monitoring capabilities. Through Echelon's i.LON 600 network server, the field device can and IP backbone to achieve seamless joins, maximum utilization of the campus IT backbone investments, avoid a repeat of the University City. System integrators provide a Web-based interface, you can use the IBMS common browser understanding of system status. When you complete a full integration, based on this platform, Web-based HMI can browse through the system using different protocols of other subsystems.
Xinjiapoguanlidaxue Device Manager Mr. Ho Thim Seng, always seeking to make the campus of equipment running even better solutions. "Control the hardware device is installed just good control of start, our goal is by building the LonWorks controller within the charged object precise control, and thus true energy efficiency, building intelligent campus. "Through continuous mining based on LonWorks technology based system's potential to Mr. Ho ThimSeng-led managers are fully capable of manipulating the system to adapt the current changes in the campus, and saving energy has accumulated more experience.

System energy-saving effect

The University City in July 2005, but the system's energy-saving and intelligent solution advantage has appeared. "In the freezer on and off State, cooling water ranges in 0.5 ° C, while other systems typically ranges in 1.5 ~ 2 ° C", the Device Manager, xinjiapoguanlidaxue Mr. Yat Tan Seng praised the system control appeared in the process. Through his experience and through the LonWorks system good adjustment, the new campus of the overall power consumption is reduced by 20 per cent in the past. Currently, he is the new University City further study how to put more equipment and systems into the LonWorks control networks platform, thereby gaining more control equipment choices, operability and achieve better energy-saving strategies.

The value of LonWorks open systems

Application of LonWorks open systems, not only significantly reduce energy consumption, improve the efficiency of residential comfort and equipment, while extending the range of the device selected, reduces system maintenance difficulty, thus reducing overall acquisition so that end users benefit from it.
Manufacturer through development and other products for compatibility to expand market — other manufacturers as partners rather than competitors. Moreover, the suppliers more focus on functionality, quality and service, without having to spend time and money to develop and maintain their own proprietary architecture; or from the order to consider and many different types of specialized products and system compatibility and time-consuming effort.
System integrators using fully compatible many manufacturer's product, they have more choices to customers more satisfied. Design and deployment easier, because the integration of parts is reduced, but are peers. Does not require gateway and customized software, no single point of failure or the need to learn to use third-party tools. System deployment faster, with fewer problems, thereby increasing customer satisfaction, and therefore can also benefit from a LonWorks open systems.