施耐德产品140CPS41400 Quantum

140CPS41400 Quantum

140CPS41400

主控指令（MC/MCR）

1）MC（主控指令） 用于公共串联触点的连接。执行MC后，左母线移到MC触点的后面。

2）MCR（主控复位指令） 它是MC指令的复位指令，即利用MCR指令恢复原左母线的位置。

在编程中，经常发生多个线圈同时由一个或一组触点控制的情况,如果在每个线圈的控制电路中串联相同的触点，则会占用大量的存储单元,使用主控制命令可以解决这个问题。

MC、MCR指令利用MC N0 M100实现左母线右移，使Y0、Y1都在X0的控制之下，其中N0表示嵌套等级，在无嵌套结构中N0的使用次数制；利用MCR N0恢复到原左母线状态。如果X0断开则会跳过MC、MCR之间的指令向下执行。

MC、MCR指令的使用说明：

1）MC、MCR指令的目标元件为Y和M，但不能用特殊辅助继电器。MC占3个程序步，MCR占2个程序步；

2）主控触点在梯形图中与一般触点垂直。主控触点是与左母线相连的常开触点，是控制一组电路的总开关。与主控触点相连的触点用LD或LDI指令。

3）MC指令的输入触点断开时，在MC和MCR之内的积算定时器、计数器、用复位/置位指令驱动的元件保持其之前的状态不变。非积算定时器和计数器，用OUT指令驱动的元件将复位，22中当X0断开，Y0和Y1即变为OFF。

4）在一个MC指令区内若再使用MC指令称为嵌套。嵌套级数多为8级，编号按N0→N1→N2→N3→N4→N5→N6→N7顺序增大，每级的返回用对应的MCR指令，从编号大的嵌套级开始复位。

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