绍了西门子PLC对四相步进电机的控制方法和编程技术、控制系统的设计方案及其软 硬件的实现方法，实现了PLC对四相步进电机的转速控制、正反转控制以及步数控制。-Siemens PLC introduce the four-phase stepper motor control methods and programming techniques, the control system hardware and software design and implementation of meth

某公司SJ-VI型教具PLC程序 对学习PLC编程有参考价值(A company sj-vi teaching AIDS PLC program)

本书为PLC编程从入门到精通的经典读物，介绍了西门子S7-200的基本工作原理，基本指令，书中还包含众多行业的丰富实例。(This book is a classic reading material for PLC programming from introduction to mastery. It introduces the basic working principle and basic instructions of Siemens S7-200. It also contain