网络将模块添加到控制器的I/O配置时，
必须输入RPI作为参数。此值指定执行的频率
生成该模块的数据。例如，如果指定的RPI为
50ms，这意味着每隔50ms，I/O模块应将其数据发送到
控制器或控制器应将其数据发送到I/O模块。
为ControlNet运行RSNetWorx时，实际的数据包间隔（API）
将进行计算。API将等于或快于RPI。
RPI仅用于生成数据的模块。例如，当地的CNB
模块不需要RPI，因为它不是数据生成成员
系统的功能；它仅用作连接远程机架的桥梁。
重要提示：不能将RPI设置为比螺母快的速率。这个
网络无法以比NUT更快的速度发送数据。
The RPI is the update rate specified for a particular piece of data on the network. When you add a module to the I/O configuration of a controller, you must enter the RPI as a parameter. This value specifies how often to produce the data for that module. For example, if you specify an RPI of 50ms, it means that every 50ms the I/O module should send its data to the controller or that the controller should send its data to the I/O module. When you run RSNetWorx for ControlNet an Actual Packet Interval (API) will be calculated. The API will be equal to or faster than the RPI. RPIs are only used for modules that produce data. For example a local CNB module does not require an RPI because it is not a data-producing member of the system; it is used only as a bridge to remote racks. Important:You cannot set the RPI to a rate faster than the NUT. The network cannot send data at a rate that is faster than NUT.
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