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Nowadays, with the development and application of PLC technology, automation, has already become the PLC intelligent remote and informatization, the important pillar. Therefore, the study of PLC is not only the automation system integration design, use and maintenance personnel's demands. Programmable controller is microcomputer technology and relay control technology, which is on the basis of sequence control in the new controller starts, carpet is a microprocessor as the core for the special computer numerical control.Electromagnetic iron is in commonly used in mining entterprise iron equipment, it is widely applied in mine, dock, power, water and sugar etc non-magnetic materials on the conveyor belt conveyor, used to remove the iron on material, in order to protect and improve the safety or coal crushers conveying materials grade. Huaneng Beijing thermal coal conveying system, the central belt # 7-14 RCDB two type, with iron disc except the ways, control logic is extremely complex, because it is still in the conventional control relay control, internal connection of abnormal disorderly, relay Numbers and types, and thus is much higher failure rate, work is not stable, if use PLC to control, and its stability will be greatly improved. Compared with the conventional relay control, PLC programming concept flexible, control logic is modified, control powerful, immunity ability and high reliability etc. Thus, when the PLC in the field of automation has basically replaced conventional relay control, widely applied. Taking huaneng Beijing thermal coal iron disc systemFor example, the use of alternating operation MODICON685E type LC realize its alternating functioning except the condition of iron is shown in figure 1, two iron (hereinafter referred to as CT1 disc except with chains and T2) hang beam in the car, small walk by motor drive, can walk in the crossbar, thus promote except in the original position, A belt, B belt of A three positions (through the walk in the six on 25th, SQ2 limit switches, SQ3, SQ4, SQ5, SQ6 to locate).

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Today, with the development of PLC technology and its applications to promote, PLC has become the system automation, information technology, remote and an important pillar of intelligence. Thus, learning PLC automation systems integration is not only the design, use and maintenance staff, an urgent requirement. Programmable Logic Controller is a micro-computer technology with conventional relay technology to control the product in order to control the basis of carpet made up of the new controller is a microprocessor as the core for digital control of a dedicated computer . Electromagnetic separator is commonly used in today's large-scale industrial and mining enterprises in the iron equipment, it is widely used in mines, terminals, thermal power plants, water, sugar and other non-magnetic material on the conveyor belt to transport materials to remove the iron, thereby protecting Coal Crusher, or security, as well as improve the delivery of quality materials. Huaneng Beijing Thermal Power Plant Coal Handling System of the central belt 7 # An RCDB-14 two-reel type magnetic separator, the use of alternate transportation mode control logic is very complex, as part of its control of the relay is still with conventional control, unusually messy internal wiring, mining the number and types of relays are also a lot of the high failure rate and therefore, work very unstable, if the PLC to use its control, its stability will go a long way to improve. And conventional compared to the relay control, PLC programming concept with a flexible, easy to modify control logic to control the powerful, anti-interference ability, high reliability. Thus, PLC in the field of automation when has basically replaced the conventional relay control, has been widely used. In this paper, Huaneng Beijing Thermal Power Plant Iron Disc Handling System Alternating operation as an example, the use of LC-type MODICON685E to achieve its run function of the turn of the working condition separator as shown in Figure 1, two disc separator (referred to as CT1, T2) with chains hanging in the beams on the car running , the small by the motor drive, you can walk on the beams in order to bring in addition to the original position, A belt-bit, B Belt 3-bit position of running back and forth (in a beam through the six limit switches Q1, SQ2, SQ3, SQ4, SQ5, SQ6 to locate).当今，随着PLC技术的发展及其应用的推进，PLC已成为系统自动化、信息化、远程化及智能化的重要支柱。因而，学习PLC不仅是自动化系统集成的设计、使用与维修人员的迫切要求。可编程序控制器是微型计算机技术与继电器常规控制技术结合的产物，是在顺序控制的基础上发毡起来的新型控制器，是一种以微处理器为核心用作数字控制的专用计算机。电磁除铁器是当今大型工矿企业中常用的铁设备,它广泛应用于矿山、码头、火电厂、水、制糖等非磁性物料输送带上,用来清除输送上物料中的铁件,从而保护破碎机或磨煤机安全以及提高输送物料的品位。华能北京热电厂输煤系统7#皮带中部安了两台RCDB-14型盘式除铁器,采用交替运方式,控制逻辑异常复杂,由于其控制部分仍用常规的继电器控制,内部接线异常零乱,采的继电器的数量及种类也颇多,因而故障率高,工作很不稳定,若改用PLC对其进行控,其稳定性将大有提高。与常规的继电器控制相比,PLC具有编程观灵活、控制逻辑易修改、控制功能强大、抗扰能力强、可靠性高等优点。因而,PLC在当的自动化领域中已基本上取代了常规的继电控制,得到广泛的应用。本文以华能北京热电厂输煤系统盘式除铁的交替运行为例,使用MODICON685E型LC实现其交替式运行功能除铁器的工况如图1所示,两台盘式除铁器(简称CT1、T2)用铁链吊挂在横梁上的行走小车上,小由电机驱动,可以在横梁上行走,从而带动除器在原始位、A皮带位、B皮带位3个位置之来回行走(通过装在横梁上的6个限位开关Q1、SQ2、SQ3、SQ4、SQ5、SQ6来定位)。