Rockwell Automation 1768-L45S Compact GuardLogix Controllers - Manual (Page 58)

58 Rockwell Automation Publication 1768-UM002C-EN-P - April 2012
Chapter 5 Add, Configure, Monitor, and Replace CIP Safety I/O
Specify the Requested Packet Interval (RPI)
The RPI specifies the period at which 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 RSLogix 5000 software.
Figure 13 - 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 74 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
59 .
View the Maximum Observed Network Delay
When the Compact GuardLogix controller receives a safety packet, the software
records the maximum observed network delay. For safety inputs, the Maximum
Observed Network Delay displays the round-trip delay from the input module to
the controller and the acknowledge back to the input module. For safety outputs,
it displays the round-trip delay from the controller to the output module and the
acknowledge back to the controller. The Maximum Observed Network Delay is
shown on the Safety tab of the Module Properties dialog box. When online, you
can reset the Maximum Observed Network Delay by clicking Reset.