3HAB8797-1/2B
3HAB8797-1/2B
3HAB8797-1/2B
数据保持设置定义CPU如何处理各数据区的数据保持任务。在数据保持设置区中选中的就是要“保持”其数据内容的数据区。所谓“保持”就是在CPU断电后再上电，数据区域的内容是否保持断电前的状态。
1.保持：选中的数据区内容会保持断电前状态
2.不保持：如果某数据区未设置为“保持”，则在CPU重新上电时，V存储区的内容会用EEPROM的内容覆盖（通常都是0），如果EEPROM中保存了数据（如在数据块中设置了V数据区的初始值），这些数据就会自动复制到V区中；其他数据区的内容会清零
在这里设置的数据保持功能靠如下几种方式实现：
1.CPU内置的级电容
2.级电容放电完毕后，如果安装了外插电池（或CPU221/222用的时钟/电池）卡，则电池卡会继续数据保持的电源供电，直到放电完毕
3.数据在断电前被自动写入相应的EEPROM数据区中（如果设置MB0 - MB13为保持）
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Applied Strength of Materials by Robert L. Mott (200...
Applied Strength of Materials by Robert L. Mott
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