【正文】 h speed I/O main line, like PCI and ether。 software development kit. Moreover PC also can provide the inparable flexibility, highly effective software as well as senior low cost hardware. Ice thermal storage air conditioning is the central power grid could be redundantnight ice electricity in the form of cold storage, in the daytime peak hours 外文翻譯資料 2 of electricity to provide airconditioning services melting ice. As most parts of our country at night than during the day much lower price, using ice cold storage central airconditioning can greatly reduce user operating costs. Ice storage central airconditioning system configuration of equipment than conventional air conditioning system to increase some, require a higher degree of automation, but it automatically to meet the requirements of the airconditioned buildings all day every day under the conditions of the energy he has exhausted all, the biggest limits to save operating costs. the PLC functions are greatly enhanced, with the following characteristics: (1) high reliability. PLC benefited from the highreliability hardware and software on a series of antijamming measures and the cycle of its special scanning methods of work. (2) with rich I / O interface module. PLC for different industrial field signal and the corresponding I / O modules and industrial devices or equipment at the scene of a direct connection. In addition to improving performance, it also has a variety of manmachine dialogue interface modules to the industrial position of local area works, it also multiple munications work interface module. (3) modular structure. To meet the needs of various industrial control, in addition to a small PLC unit, the vast majority of PLC are modular structure. PLC various ponents, including the CPU, power supply, I / O, etc. is modular in design from the rack and cables will connect each module, the system39。 high industrial applicability, allowing the ambient temperature of 60 ℃ 。 b) duplex status of a separate icemaking mainframe model。 d) of icemelting separate cooling mode。 Commitment chilled water pumps, status and fault alarm glycol pump startup and shutdown, status and fault alarm startup and shutdown cooling pumps, status and fault alarm bypass pipe pressure measurement and display of pressure the cooling tower fan Commitment, status and fault alarm。 for / return water temperature, pressure telemetry control and display the import and export side of plate heat exchanger temperature control and display。 chilled water backwater flow control and display。 outdoor temperature and humidity control and telemetry showed ice storage and display of measurement the end of cold load control. Data recording and printing functions Control system for the monitoring of the needs of the trends point to the entire record, the control system can be the load throughout the year (including the maximum daily load and the load throughout the day) and equipment uptime as tables and charts record for users . All monitoring points and the calculated data can be automatically print regularly. manual / automatic conversion function Flexible control system configuration manual / automatic conversion function. 外文翻譯資料 8 optimized control function According to outdoor temperature, weather, weather trends, the historical record, such as mainframe data automatically select the priority or icemelting priority. In the end load to meet under the premise of the daily use of the cold storage End, as far as possible to run mainframe. Give full play to ice cold storage system advantages, saving operating costs. automatic functionality From the PC system can work, in accordance with timetable for the automatic icemaking and control system operation, the conversion status of the system for automatic fault diagnosis, and remote alarm. Touch screen display systems operations, processes, each node parameters and operating records, the police records. holidays function set According to the timetable system can be run automatically, but also to preset holidays, and ice control certificates and certificates of ice time, the system does not require the holidays when the supply of cooling airconditioned places to stop. operating under the crew function Lowercolor touchscreen operator interface Figure 1. Under the crew operating functions are as follows: A) humanputer dialogue. Operation can be carried out through the touch panel interactive, user interface pletely in the culture, with tips, help, parameter settings, key settings, fault enquiries, history and so on. B) system settings. Including operation password settings, run setup, operation of the timetable set record overflow processing, automatic / manual / test selection, holiday settings, the system parameter settings (including the junctio n temperature, pressure, the media flow, reservoir ice, ice rate, the icem