The LK bit specifies whether the address of the next sequential instruction is saved in the Link Register as a return address for a subroutine call.
LK位指定了下一个顺序指令的地址是否作为子例程调用的返回地址保存在链接寄存器中。
A program references storage using the effective address computed by the processor when it executes a storage Access or Branch instruction or when it fetches the next sequential instruction.
在程序执行Storage Access或Branch指令或者在存取下一条顺序指令时，它将使用处理器计算出的有效地址引用存储设备。
The different characteristics between S/R instruction and Step Ladder instruction (STL) for designing sequential control program of PLC are putted forward passing through comparison.
通过比较，指出了S/R指令和步进指令在设计PLC顺序控制程序时所具有的不同特点。
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