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组合 钻床 电气 控制系统 改造 设计

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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 series products of all sizes. Of all sizes can be used for industrialcontrol occasions. In addition to the logical processing functions, the most modern PLC equipped with a sophisticated computing power data can be used in a variety of digital control. PLC in recent years a large number of functional units, so that penetration to the position of PLC control, temperature control, CNC and other industrial control. Coupled with enhanced communications capabilities PLC and human-machine interface technology, the use of PLC control system composed of a variety of very easily. 3. Easy to learn and use by engineering staff welcomes PLC as a general-purpose industrial control computer, is the industrial control equipment for industrial and mining enterprises. It interfaces easily, easy programming language for engineering and technical staff. Ladder language graphic symbols and expressions, and very close to the relay circuit, only a small amount of PLC logic control command switch can easily achieve the functions of the relay circuit. Is not familiar with electronic circuits, computer principles and do not use assembly language to engage in industrial control computer and opened the door.4.System design, construction work in small, easy maintenance, easy totransform PLC connection with storage in place of logic logic, greatly reducing the wiringand external control equipment to control design and construction of the cycle is much shorter, at the same time has become easy to maintain. More importantly, the equipment have been changed so that the same procedure to change the production process possible. It is suitable for multi-variety, small batch production of occasions. 5. Small size, light weight, low energy consumption To ultra-small PLC as an example, the new varieties produced at the bottom of size less than 100mm, weight less than 150g, just a few watts power consumption. Due to small size easily into the internal machinery to achieve the ideal of mechanical and electrical control equipment integration. The reason why we choose the above reasons PLC, its basic structure can be? From the sub-structure, PLC is divided into fixed and modular (modular) two. Fixed PLC including CPU boards, I / O board, display panel, memory blocks, power and so on, into a combination of these elements are not removable as a whole. Modular PLC including the CPU module, I / O modules, memory, power supply modules, backplane, or chassis, the modules can be configured according to certain rules of combination. PLC software system by the system procedures and user program composed of two parts. System procedures, including monitoring procedures, compiler, diagnostic procedures, mainly for the management of the entire machine, programming language will be translated into machine language, machine fault diagnosis. System software provided by the PLC manufacturers and has been curing in the EPROM can not directly access and intervention. User program is the user control at the scene, the PLC programming language used in the preparation of applications (that is, logic control) is used to achieve a variety of control. STEP7 for SIMATIC programmable logic controller of the standard configuration and programming software package, that is, user programs, we are used to carry out STEP7 hardware configuration and logic programming, logic programming, as well as results of the implementation of online surveillance.PLC course of development in the industrial production process, a large number of switches to control the volume of the order, which in accordance with the terms of the order of the logic of action, and in accordance with the logic of the relationship between the chain to protect the control action, and a large number of discrete volume data collection. Traditionally, these functions through pneumatic or electrical control system to achieve. However, with advances in industrialization, PLC has come in a wide range of applications, and its specific application of iron and steel, petroleum, chemical, electric power, building materials, machinery manufacturing, automobile, textile, transportation, environmental protection and cultural entertainment and other industries, the use of more or less switch can be summarized in the logic control, analog control, motion control, process control, data processing, communications and networking. 21, PLC will have greater development. From a technical point of view, the new achievements in computer technology will be more programmable controller used in the design and manufacturing, there will be faster, bigger storage capacity, intelligent species emerged stronger; from the product scale of view, further to the direction of ultra-small and large development; from the matching of products, the variety of products will be more rich, more complete specifications, the perfect man-machine interface, a comprehensive communications equipment will be better adapted to a variety of industrial control the demand for places; from the market point of view, the production of more varieties of their respective products as international competition and to break, there will be a few brand monopoly situation in the international market, there will be international programming language; from the development of the network, the programmable controllers and other industrial control computer network constitutes a large-scale programmable logic controller control system is the development direction of technology. At present, computer distributed control system DCS (Distributed Control System) has been a large number of programmable controller applications. Along with the development of computer networks, programmable controllers, as automation and control networks and international networks, an important part in industry and industrial fields other than play an increasing role.5可编程控制器PLC英文全称Programmable Logic Controller ,中文全称为可编程逻辑控制器，是以计算机技术为基础的新型工业控制装置。它采用一类可编程的存储器，用于其内部存储程序，执行逻辑运算,顺序控制，定时，计数与算术操作等面向用户的指令，并通过数字或模拟式输入/输出控制各种类型的机械或生产过程。PLC是可编程逻辑电路，也是一种和硬件结合很紧密的语言，在半导体方面有很重要的应用，可以说有半导体的地方就有PLC。其主要包括以下几个特点： 1可靠性高，抗干扰能力强 高可靠性是电气控制设备的关键性能。PLC由于采用现代大规模集成电路技术，采用严格的生产工艺制造，内部电路采取了先进的抗干扰技术，具有很高的可靠性。例如三菱公司生产的F系列PLC平均无故障时间高达30万小时。一些使用冗余CPU的PLC的平均无故障工作时间则更长。从PLC的机外电路来说，使用PLC构成控制系统，和同等规模的继电接触器系统相比，电气接线及开关接点已减少到数百甚至数千分之一，故障也就大大降低。此外，PLC带有硬件故障自我检测功能，出现故障时可及时发出警报信息。在应用软件中，应用者还可以编入外围器件的故障自诊断程序，使系统中除PLC以外的电路及设备也获得故障自诊断保护。这样，整个系统具有极高的可靠性也就不奇怪了。2配套齐全，功能完善，适用性强PLC发展到今天，已经形成了大、中、小各种规模的系列化产品。可以用于各种规模的工业控制场合。除了逻辑处理功能以外，现代PLC大多具有完善的数据运算能力，可用于各种数字控制领域。近年来PLC的功能单元大量涌现，使PLC渗透到了位置控制、温度控制、CNC等各种工业控制中。加上PLC通信能力的增强及人机界面技术的发展，使用PLC组成各种控制系统变得非常容易。3易学易用，深受工程技术人员欢迎PLC作为通用工业控制计算机，是面向工矿企业的工控设备。它接口容易，编程语言易于为工程技术人员接受。梯形图语言的图形符号与表达方式和继电器电路图相当接近，只用PLC的少量开关量逻辑控制指令就可以方便地实现继电器电路的功能。为不熟悉电子电路、不懂计算机原理和汇编语言的人使用计算机从事工业控制打开了方便之门。4系统的设计、建造工作量小，维护方便，容易改造PLC用存储逻辑代替接线逻辑，大大减少了控制设备外部的接线，使控制系统设计及建造的周期大为缩短，同时维护也变得容易起来。更重要的是使同一设备经过改变程序改变生产过程成为可能。这很适合多品种、小批量的生产场合。5体积小，重量轻，能耗低以超小型PLC为例，新近出产的品种底部尺寸小于100mm，重量小于150g，功耗仅数瓦。由于体积小很容易装入机械内部，是实现机电一体化的理想控制设备。以上就是我们之所以选用PLC的原因，可