中英文翻译--可编程控制器.doc

PLC  PLC name in English Programmable Logic Controller, the Chinese called the programmable logic controller, based on computer technology is a new type of industrial control devices. It uses a class of programmable memory, for its internal storage procedures, the implementation of logic operations, sequence control, timing, counting and arithmetic operations, such as user-oriented instruction, and digital or analog input / output control of all types the mechanical or production process. PLC is a programmable logic circuits, and hardware is also a very strong combination of language, in the semiconductor has a very important application,is a place where there semiconductor PLC. Its main features include the following: 1. High reliability, strong anti-interference ability High reliability of electrical control equipment is the key to performance. PLC as a result of the use of modern large-scale integrated circuit technology, strict production process, the internal circuit to take an advanced anti-jamming technology, with high reliability. For example, the production of the Mitsubishi F series PLC MTBF of up to 300,000 hours. Some use of the PLCs CPU redundancy MTBF longer working hours. From the PLC circuit of the machine, the use of PLC control system constitutes, and the same size of the relay contact system, electrical wiring and the switch contact has been reduced to a few hundreds or even thousandths, fault will be greatly reduced. In addition, PLC hardware failure with self-detection, failure alarm information in time. In the application software, the application also can be incorporated into the external device fault self-diagnosis procedure, the system in addition to the circuit outside the PLC and equipment has also been the protection Fault self-diagnosis. In this way, the entire system with extremely high reliability is not strange. 2. Complete package, perfect functions and applicability Development of PLC, have formed large, medium and small serie