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6ES7953-8LF20-0AA0 SIMATIC 内存卡
当我们按下X000后,程序跳转指令开始运行,程序所跳转的位置为程序指针所在的位置,也就是标号10,在这里我们要注意程序指针写在左母线的左边。当我们启动跳转指令后,X001这段程序就会被跳过不执行。
当X0为ON时,被跳转CJ命令到标号之间的程序不子执行。在跳转过程中如果Y、M,S被OUT、SET. RST指令驱动使输入发生变化则仍保持跳转前的状态。例如,通过X1驱动输出Y10后发生跳转,在跳转过程中即使X0变为ON,但输出Y10仍有效。
注意:
1、对于T、C,如果跳转时定时器或计数器正发生动作,则此时立即中断计数或停止计时,直到跳转结束后继续进行计时或计数。但是,正在动作的定时器T192~T199与高速计数器C235~ C255. 不管有无跳转仍旧维续工作。
2、功能指令在跳转时不执行,但PLSY、 PLSR、PWW指令除外。
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