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A16B-2202-0730
A16B-2202-0730
在CPU的循环程序处理过程中,过程映象区被自动刷新。
你也可以不刷新过程映象,如果你要:
• 直接访问I/O 或者
• 用系统功能SFC26 UPDAT_PI 和SFC27 UPDAT_PO在程序的不同点刷新一个或多个过程映象的输入或输出部分。
通讯负载
你可以使用CPU参数“Scan Cycle Load from Communication(扫描通讯循环负载)”,在给定框架内控制通讯过程的持续时间,因为一般通讯过程会增加扫描循环时间。
例如通讯过程包括以MPI方式将数据传送至其它CPU,或使用编程设备加载的通讯功能块。
该参数很少影响编程器测试功能。当然,你可以显著增加扫描时间。在处理模式中,你可以限制测试功能的时间(只适用于S7-300)。
参数的工作原理
CPU操作系统可持续提供用户组态的整个CPU处理能力的百分比(时间片技术)用于所组态的通讯。但如果不需要处理通讯时,可用于其它处理。
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