【正文】 2 interface with the equipment available PC / PPI free cable linking munications munication. Chip and Chip Holders lntegrated Circuis are usually called Ics or chips. Thay are plex circuits, which have benn etched onto tiny chips of semiconductor(silicon). The chip is packaged in a plastic holder with pins spaced on a ()grid, which will fit the holes on stipboard. Very fine wires inisde the package link the chip to the pins. 1) Pin numbers The pins are numbered anticlockwise around the IC(chip) starting near the notch or dot. It shows the numbering for 8pin and 14pin Ics, but the principle is the same for all sizes. 2) Chip holders(DIL sockets) ICs(chip)are easily damageded by heat when soldering and their short pins cannot be protected with a heat sink. Instead we use a chip holder, strictly called a DIL socket(DIL=Dual InLine), which can be safely soldered onto the circuit board. The chip is pushed into the holder when all solding is plete. Chip holders are only nedded when solding so they are not used on breaboards. Commercially produced circuit boards often have chips soldered directly to the board without a chip holder ,usually this is done by a machine which is able to work very quickly .Please donnot attemp to do this yourself because you are likely to destory the chip and it will be different to remove without damage by desoldering. 外文翻譯資料 5 3) Removing a chip from its holder 4) If you need to remove a chip it can be gently prized out of the holder with a small flatblade screwdriver. Carefully lever up each end by inserting the screwdriver blade between the chip and its holder and gently twisting the screwdrive. Take care to statre lifting at both ends before you attempt to remove the chip,otherwise you will bend and possibly break the pins. 5） Bipolar Integrated Circuits MOS Integrated Circuits Historically, bipolar Integrated Circuits used to be much more popular than MOS Integrated Circuits,particularly for smallsace logic Circuits. There were two major reasons for this: first, bipolarjunction transistors originally could be manufactured more reliably than MOS transistors,and second , they were faster, As the reliabitity of MOS transistors improved, and as integrated Circuits became more plex , which made the lower power and small size of MOS logic more important, the popularity of BJT logic decreased, however, BJT technology is still popular for the highest frequency logic circuits. When the PC offline, under the control of the next crew, the entire system can operate normally. PC System (central management workstation) PC PC that is by control centre, mainly by the PC and laser printer ponents, SIMATIC WINCC software platform used by the entire Chinese user interface, friendly manmachine dialogue. Management and operation, can be observed by PCdisplay all kinds of information to understand the current and previous controlled the entire ice storage system and the operation of all parameters, and equipment through the mouse print management and the implementation of tasks. WINCC software platform WINCC software in the field of automation can be used for all operator control and monitoring tasks. Process control can be in the events clearly show, can show that the current state records in accordance with the order, all the recorded data can be displayed or select summary form, or may be required for editing, and output print statements and trends . 外文翻譯資料 6 WINCC able to control the process of the critical early stages of the report, and the signal can be displayed on the screen, and can also use voice demonstrated. It support the use of online help and operational guidelines to eliminate fault. WINCC a specialized workstations can be used to control the process so that the important process information is not shielded. Aided software strategy assurance process is not illegal access, and provide for the industrial environment no wrong in the operation. WINCC is MICRSOFT WINDOWS98 or WINDOWS operating system, running on a PC objectoriented class 32 applications, through Windows OLE and ODBC standard mechanism, as an ideal munications partners to enter WINDOWS world, and therefore can be easily WINCC to integrate a panywide data processing system. 3 ice storage system control control objectives, scope and mainly controlled equipment Storage Control System control purposes: Through the refrigeration host, ice storage devices, plate heat exchanger, the system pumps, cooling towers, piping system regulating valve control, ice storage system adjustment of the status of the operation mode, in the most economical circumstances to the terminal to provide a stable water supply temperature. At the same time, improve the level of automation, improve the management efficiency and reduce labor intensity management. Control of the ice storage system, including the entire state of the parameters, equipment status and control, t