STEP 7梯形图指令系统分类

    STEP 7梯形图指令系统一共分14类指令，分别是：    ·位逻辑指令类( Bit Logic Instructions)；    ·比较指令类( Comparison Instructions)；    ·转换指令类( Conversion Instructions)；    ·计数器指令类( Counter Instructions)：    ·数据块指令类( Data Block Instructions)；    ·逻辑控制指令类( Logic Control Instructions)；    ·整型数算术运算指令类(Integer Math Instructions)；    ·浮点数算术运算指令类( Floating Point Math Instructions)；    ·赋值指令类( Move Instructions)：    ·程序控制指令类( Program Control Instructions)；    ·移位和旋转指令类( Shift and Rotate Instructions)；    ·状态位指令类( Status Bit Instructions)；    ·定时器指令类( Timer Instructions)；    ·字逻辑指令类( Word Logic Instructions)。