在PLC控制系统中的系统思维The system think

目前，随着微电子技术的发展，PLC控制系统的应用已经远远突破了早期的逻辑控制，从硬件到软件、从单机到系统、从逻辑控制到过程控制，功能异常强大，产品非常丰富，以西门子、罗克维尔、施耐德等几个知名品牌来说，产品系列非常齐全，几乎每个系列又都覆盖大、中、小各种规模的应用场合，给使用者全面、快速地掌握PLC的应用增加了很大难度。为阐述方便，本文从西门子S7系列PLC着手，希望从系统思维的角度来全面分析PLC控制系统在各种应用场合中产品选型与解决方案。
[Abstract] Now, with the development of micro-electronics, the application of PLC control system has breached the early logical control out and away. From hardware to software, from stand-alone to system, from logical control to process control , the functions are very strong, the product are very rich .Such as Siemens, Rockwell and Schneider , the product series are very complete , and the each series products almost cover with large , middle and small scale applications . This increases very difficulty for the custom to mastery PLC control technology entirely and rapidly . IN order to expatiate for its convenience , this article will do my best to entirely analyse the PLC selecting type and resolving projects from the angle of system thinking , according to the Siemens s7 series products.