CAT 1305-BA01A-HA2

CAT 1305-BA01A-HA2    CAT 1305-BA01A-HA2 
楼主观察到的现象不奇怪，S7-300/400的定时器自动选择时间基准，从仿真和上图中定时器的当前值可以看出，预设值为6s和60s的定时器的时间基准分别为10ms和100ms。定时器的定时是有误差的，仅仅因为时间基准不同，也会使两个定时器的积累误差不同。
S7-200的10ms和100ms的定时器的运行机制完全不同，100ms的定时器与指令的执行有关，10ms定时器是在每个扫描周期开始时处理时间当前值的。S7-300/400也有可能这样处理。
楼主采用的定时器电路在前后两段定时的切换时需要一个扫描周期。这也会影响到两个定时器的时间同步。
对于一般的应用，这种误差无关紧要。要求准确的定时可采用循环中断组织块。
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厦门岳航计算机工程有限公司
联系人：黄华新          Q Q ：2339016238
电话：0592-5087576      手机：  
传真：0592-5165561（注黄华新收）
邮箱：2339016238@           
地址；厦门思明区湖滨东路湖光大厦18楼A单元
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