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Appendix C
Reaction Times
80
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.
The Connection Reaction Time Limit is adjusted immediately when the RPI
is changed via the Studio 5000 Logix Designer application.
Figure 22 - 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
System Reaction Time on page 13
For typical applications, the default Connection Time Reaction Limit for
input connections of 4 x RPI and the default Connection Time Reaction
Limit for output connections of 3 x RPI is usually sufficient. For more complex
requirements, use the Advanced button to modify the Connection Reaction
Time Limit parameters, as described on
View the Maximum Observed Network Delay
The Maximum Observed Network Delay is shown on the Safety tab of the
Module Properties dialog box. When online, click Reset to reset the Maximum
Observed Network Delay.
Figure 23 - Reset the Max Observed Network Delay
Rockwell Automation Publication 1756-RM012B-EN-P - April 2018
for safety task period details.
page
84.
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