文档介绍：s7-300PLC 编程语句手册汇总 S7-300 编程语言与指令系统 S7-300 编程语言与指令孟令生整理 STEP 7 编程语言介绍......................................................................................................................... ........ 2 数据类型................................................. ........................................................................ .............................. 3 参数数据类型........................................................................................................................... .............. 4 PLC 用户存储区的分类及功能.................................................................................................................. 5 指令操作数.............................................................................................................. ............. ........... 5 寻址方式........................................................................................................................... ...................... 6 状态字................................................................. .......................................................... .......................... 8 基本逻辑指令......................................................................................................................... ...................... 9 置位和复位指令........................................................................................................................... ..11 RS和 SR 触发器.................................................................................................................. ....... ......... 12 跳变沿检测指令........................................................................................................................... ........ 12 定时器与计数器指令............................................................................ ............................................... 15 计数器指令......................................................................................................................... ........................ 20 访问 CPU 的时钟存储器......................