80 Rockwell Automation Publication 1756-UM022D-EN-P - May 2017
Chapter 5 Add, Configure, Monitor, and Replace CIP Safety I/O Devices
Specify the Requested Packet Interval (RPI)
The RPI specifies the period that data updates over a connection. For example,
an input module produces data at the RPI that you assign.
For safety input connections, you can set the RPI on the Safety tab of the
Module Properties dialog box. The RPI is entered in 1 ms increments, with a
range of 1…100 ms. The default is 10 ms.
The Connection Reaction Time Limit is adjusted immediately when the RPI
is changed via the Logix Designer application.
Figure 19 - Requested Packet Interval
For safety output connections, the RPI is fixed at the safety task period. If the
corresponding Connection Time Reaction Limit is not satisfactory, you can
adjust the safety task period via the Safety Task Properties dialog box.
See
Safety Task Period Specification on page 102 for more information on the
safety task period.
For typical applications, the default RPI is usually sufficient. For more complex
requirements, use the Advanced button to modify the Connection Reaction
Time Limit parameters, as described on page
82.
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