可编程控制器plc外文翻译-plc设计(编辑修改稿)

可编程控制器plc外文翻译-plc设计(编辑修改稿)内容摘要：

nd transistor isolation relays. Analog: by type of signal, a current type (420mA ,020mA), voltage (010V ,05V,1010V) and so on, by the precision points are 12bit, 14bit, 16bit, etc. . In addition to these generalpurpose IO, there are special IO modules, such as thermal resistance, thermocouple, pulse and other modules. 6 By I/O module specifications and to determine the number of points, I/O modules can be more or less, but the maximum number of CPU can be the basic configuration management capabilities, which by the largest floor or rack slot limit. Power Modules PLC power supply modules for the PLC to provide the power supply integrated circuits. Meanwhile, some of them for the work input circuit to provide 24V power supply. Power input types are: AC power (220VAC or 110VAC), DC power supply (monly used to 24VDC). Most modular PLC to use floor or rack, its role is to: electrical, the realization of the modules, so that the CPU can access all the modules on the floor, machinery and realize the connection between each module, so that each module constitutes a overall. 3 Installation and debugging Of PLC control system Programming device: development and application programmer is the PLC to monitor the operation, inspection, maintenance indispensable device for programming, some system settings, monitor the PLC and the PLC control system working conditions, but it is not directly involved in field control run. PLC programmers are generally small handheld programmer, the current general by the puter (running programming software) as programmer. That is, our system PC. Human Machine Interface is the simplest indicators and buttons, the current LCD screen (or touch screen) typeone operator terminal has been widely applied by the puter (running the configuration software) as a very popular manmachine interface. PLC munication work rely on advanced industrial work technology can quickly and efficiently collect, transfer of production and management of data. Therefore, the work automation system integration projects in the importance of more and more significant, even been suggested that the work is the controller39。 s point of view argument. PLC is a service specifically for the industrial production control device, usually do not need to take measures, it can be directly used in industrial environments. However, when the production environment is too harsh, especially strong electromagic interference, or improper installation, can not guarantee the normal operation of PLC, and therefore should pay attention to the following questions using the. 7 First, the working environment 1. PLC required temperature in the temperature 0 ~ 55 ℃ , heating installation, large ponents can not be placed below the space around the ventilation and cooling should be large enough, the basic unit and expansion unit interval between the need for more than 30mm。 switch cabi, the lower should be a ventilation shutters, to prevent too much direct sunlight。 if the surrounding Stresses above 55 ℃ , to install electric fan forced ventilation. 2. PLC humidity in order to ensure the insulation performance, air relative humidity should be less than 85% (no condensation). 3. PLC should be made from a strong shock vibration source, to prevent the vibration frequency of 10 ~ 55Hz frequent or continuous vibration. When the environment is inevitable when using vibration, shock absorption to take measures, such as glue, such as using shock absorption. 4. Air to avoid corrosion and flammable gases, such as hydrogen chloride, hydrogen sulfide, etc.. The more the air of dust or corrosive gas environment can be installed in a closed PLC good control room or control cabi, and install air cleaning devices. 5. Power PLC power supply is 50Hz, 220 (1 177。 10%) V AC, for the power cord to the interference, PLC itself has sufficient capacity to resist. Reliability requirements for high power interference is particularly serious situation or environment, you can install a shield with variable ratio of 1:1 isolation transformer to reduce the interference between the equipment and land. Power input can also be cascaded LC filter circuit Second, installation and wiring 1. Power lines, control lines and power lines and PLC I/O lines should be split wiring, isolation transformer and PLC and I/O should be used between the cable connections. 2. PLC should stay away from strong interference sources such as welding, highpower silicon rectifier devices and large power equipment, not with the highvoltage electrical switch installed in the same cabi. 3. PLC input and output separately from the best alignment, switch and analog should be laid separately. The transmission of analog signals should be shielded cable, one end or both ends of the shield should be grounding resistance should be less than the shielding layer 1 / 10. 4. PLC basic unit and expansion modules and functional modules, connecting cables 8 should be installed separately, to prevent interference from outside signals. 5. AC output line and DC output lines do not use the same cable, the output line should be far from power lines and power lines, to avoid parallel. Third, I/O wiring terminal 1. Input Connection (1) Input connection generally should not exceed 30 meters. But if the environment interfere with small, small voltage drop, the input terminal Longer be appropriate. (2) Input / output lines can not be used with a cable, input / output lines should be separated. (3) The extent possible, normally open contact form connected to the input in the establishment of the ladder and relay the same schematic 2. Output connection (1) Output terminal is divided into separate output and public output. In different groups, using different types and voltage levels of output voltage. However, output in the same group。