For the same target component, SET and RST can be used multiple times, and the order can be arbitrary, but the final executor is valid. Differential Instructions (PLS/PLF)

(1) PLS (rising edge differential instruction) generates a pulse output of one scanning cycle at the rising edge of the input signal;





(2) PLF (falling edge differential instruction) generates a pulse output of one scan cycle at the falling edge of the input signal.




The differential instruction is used to detect the edge of the signal, and the state of Y0 is controlled through the set and reset commands.





Instructions for PLS and PLF instructions:




1) The target components of PLS and PLF instructions are Y and M;





2) When PLS is used, the target element is ON only in a scanning cycle after the drive input is ON, and M0 is ON only in a scanning cycle when the normally open contact of X0 is from off to on; When using the PLF command, only the falling edge of the input signal is used to drive, and the others are the same as PLS.





Master control instruction (MC/MCR)





1) MC (master control command) is used for connection of common series contact. After performing MC, the left bus moves to the rear of the MC contact.





2) MCR (Master Control Reset Command) is the reset command of MC command, that is, the MCR command is used to restore the position of the original left bus.




In programming, it often happens that multiple coils are controlled by one or a group of contacts at the same time. If the same contacts are connected in series in the control circuit of each coil, many storage cells will be occupied. Using the master control command can solve this problem.




MC and MCR instructions use MC N0 M100 to shift the left bus to the right, so that Y0 and Y1 are under the control of X0, where N0 represents the nesting level, and there is no limit to the number of times N0 can be used in a non nesting structure; Restore to the original left bus state by using MCR N0. If X0 is disconnected, instructions between MC and MCR will be skipped and executed downward.





Instructions for use of MC and MCR instructions:




1) The target components of MC and MCR commands are Y and M, but special auxiliary relays cannot be used. MC takes up 3 program steps and MCR takes up 2 program steps;





2) The main control contact is perpendicular to the general contact in the ladder diagram. The main control contact is a normally open contact connected to the left bus, which is the main switch controlling a group of circuits. The contact connected to the main control contact must use LD or LDI command.





3) When the input contact of MC command is disconnected, the integral timer, counter and components driven by reset/set command within MC and MCR remain unchanged. For non integrating timers and counters, the components driven by the OUT command will reset. In 22, when X0 is disconnected, Y0 and Y1 become OFF.对于同一目标元件，SET、RST可多次使用，顺序也可随意，但0后执行者有效。微分指令（PLS/PLF）


（1）PLS（上升沿微分指令） 在输入信号上升沿产生一个扫描周期的脉冲输出；



（2）PLF（下降沿微分指令） 在输入信号下降沿产生一个扫描周期的脉冲输出。


利用微分指令检测到信号的边沿，通过置位和复位命令控制Y0的状态。



PLS、PLF指令的使用说明：


1）PLS、PLF指令的目标元件为Y和M；



2）使用PLS时，仅在驱动输入为ON后的一个扫描周期内目标元件ON，M0仅在X0的常开触点由断到通时的一个扫描周期内为ON；使用PLF指令时只是利用输入信号的下降沿驱动，其它与PLS相同。



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。


在编程时常会出现这样的情况，多个线圈同时受一个或一组触点控制，如果在每个线圈的控制电路中都串入同样的触点，将占用很多存储单元，使用主控指令就可以解决这一问题。


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的使用次数无限制；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必须用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。

英维思(3008, 3625, 3508E.3721, 3700A 4351B)

本特利(3500/42M， 3500/ 22M, 3500/ 95.3500/05)

黑马(F3330, F3236， F6217, F7126, F8621A)

福克斯波罗(FBM203, FBM204, FBM217, FMB231)

AB: (1746 1747 1756 1770 1771 1785触摸屏2711系列CPU PLC)

普罗索芙特PROSOFT MVI46/56/69, AB旗下，跟AB模块

瑞恩RELIANCE模块,卡件

飞利浦EPRO MMS6210/ 621…. PR6423/003-031

美尔托Meltal MT1102-02-00, MS3101-00-00, MS3102-01-00

横河YOKOGAWA AAI, ADV, ADI, ANB, AMM, SB, PW(型号开头),卡件模块(CPU,电源,输出，PLC)

摩尔MOORE Q开头, 3开头模块,像电视显示器

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