Rockwell Automation Publication 1769-UM022C-EN-P - June 2018 155
Develop Safety Applications Chapter 9
8. In the Requested Packet Interval (RPI) field, enter the RPI for the
connection in 1 ms increments. The default is 20 ms.
The RPI specifies the period when data updates over a connection. The
RPI of the consumed safety tag must match the safety task period of the
producing safety project.
The Connection Reaction Time Limit is the maximum age of safety packets
on the associated connection. For simple timing constraints, you can achieve
an acceptable Connection Reaction Time Limit by adjusting the RPI.
The Max Network Delay is the maximum observed transport delay from
the time the data was produced until the time the data was received.
When online, click Reset Max to reset the Max Network Delay.
9. If the Connection Reaction time limit is acceptable, click OK; or for
more complex requirements, click Advanced to set the Advanced
Connection Reaction Time Limit parameters.
The Timeout Multiplier determines the number of RPIs to wait for a
packet before declaring a connection timeout.
The Network Delay Multiplier defines the message transport time that
is enforced by the CIP Safety protocol. The Network Delay Multiplier
specifies the round-trip delay from the producer to the consumer and
back to the producer. You can use the Network Delay Multiplier to
increase or decrease the Connection Reaction Time Limit.
Consumer’s Project
Producer’s Project
Table 28 - Additional Resources
Resource Description
Estimate Requested Packet Interval
on page 87
and
Module Fault Related to RPI Estimates on page 88
Provides more information on setting the RPI and
understanding how the Max. Network Delay, Timeout
Multiplier, and Network Delay Multipliers affect the Connection
Reaction Time
Logix 5000 Controllers Produced and Consumed
Tags Programming Manual,
publication 1756-PM011
Provides detailed information on using produced and
consumed tags
To Next Page
Loading...
Need help?
General
