产品描述：【force sys68k/cpu-30zbe】
并联电路的串联（anb）指令
anb指令的功能、电路表示、操作元件、所占的程序步如表 所示。
表anb指令在梯形图中的表示
anb：多触点电路块的串联连接指令，其应用如图所示。
anb指令是不带操作元件的指令。两个或两个以上触点并联连接的电路称为并联电路块。当并联电路块与前面的电路串联连接时，使用anb指令。即分支起点用ld、ldi指令，串联电路块结束后需使用anb指令，以表示与前面电路的串联。anb指令原则上可以无限次使用，但受ld、ldi指令只能连续使用8次的限制，anb指令的使用次数也应限制在8次。
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