1734-OB2E
1756-PBXT
为了完成控制策略，为了替代继电器，使用户等完成类似继电器线路的控制系统梯形图，而编制了一套控制算法功能块(或子程序)，称为指令系统，固化在存贮器ROM中，用户在编制应用程序时可以调用。指令系统大致可以分为两类，即基本指令和扩展指令。细分一般PLC的指令系统有:基本指令、定时器/计数器指令、移位指令、传送指令、比较指令、转换指令、BCD运算指令、二进制运算指令、增量/减量指令、逻辑运算指令、特殊运算指令等，这些指令多是类似汇编语言。另外PLC还提高了充足的计时器、计数器、内部继电器、寄存器及存贮区等内部资源，为编程带来极大方便。
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