基于PLC的机床电气控制系统设计摘要：我们在各种场合看到了继电-接触器控制，那已经是时代的过去，如今的继电器只能作为低端的基层控制模块或者简单的设备中使用到，而PLC的出现也成为了划时代的主题，通过比较稳定的硬件穿插灵活的软件控制，使得自动化走向了新的高潮。本课题利用西门子S7-200PLC对T68镗床原有的继电-接触器控制系统进行了改造；阐述了系统改造方案，同时根据镗床的控制要求和特点，确定PLC的输入、输出分配，设计出梯形图并进行了模拟调试。关键词：西门子PLC；镗床；改造ThedesignofelectriccontrolsystemformachinetoolbasedonPLCAbstractWecomeinsightofthecontrolthatlinksaftertheelectricappliancesinvarioussituation,thatisalreadythethattimegenerationpast,nowofafteruseinthemoldaperhapssimpleequipmentsofgrass-rootscontrolthattheelectricappliancescandoforthelowlevelonly,AndthePLCemergencealsobecametheepoch-makingtopic,addingthevividsoftwarecontrolthroughaveryandstablehardware,makingtheautomationheadforthenewhightide.ThistextusetheSiemensS7-200PLCtoreformtheT68boring．Thesystemlathereformationprojectisdescribed．inThedetailPLCimportationandinput/outputallotmentareensuredaccordingtothecontrolrequirementandcharacteristicsof．Atheboringlathecontrolcircuitisdesignedandcommissionedinthesimulation．Keywords：SiemensPLC；boringlathe；reformation目录第一章绪论...........................................................11.1PLC技术背景........................................................................................................11.2PLC的系统结构....................................................................................................11.2.1软PLC开发系统..........................................................................................11.2.2软PLC运行系统..........................................................................................21.3PLC技术应用的优势...........................................................................................21.4PLC控制与微机控制的区别...............................................................................4第二章T68机床的用途、主要结构和运动.................................5第三章电力拖动方式和控制要求.........................................83.1机床的电力拖动方式..........................................................................................83.2T68型