NI PXI-4072以高达1毫秒/秒的速率提供模拟输出
停止模式到运行模式的转换
CPU从停止模式到运行模式的转换过程中执行以下操作:
■确认扫描模式和程序 编制模式选择
■确认程序使用的变量和实际配置的变量范围
■重新初始化外部程序块和独立C程序所使用的数据空间
■清空非保持型的存储区域
闪存操作
CPU在以电池为后备电源的RAM中存储应用程序和硬件配置。对于PAC系统来说,你也可以选择将逻辑,硬件配置,变量数据存入闪存本地闪存。PAC系统CPU提供了足够的闪存空间来存储所有的用户可空间(10MB)里的数据,并且能够满足更高的要求。变量表不计入用户空间。关于哪些内容计入用户空间,请参考附录B。CPU上电时,会读取逻辑和配置,变量表数据。缺省情况是从RAM读取。然而逻辑/配置,变量表每--类数据都可以配置为总从闪存读取或有条件从闪存读取。要在编程软件中配置这些参数,选择CPU硬件配置中的设定键。如果选择有条件的将闪存作为的数据来源,只在检测到内存崩溃或者没有电池时从闪存读取数据(上电时)。建议使用此方式,因为闪存是稳定的而且不需要电池作为后备电源来保持数据。
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