Rockwell Automation 1768-L45S Compact GuardLogix Controllers - Manual (Page 85)

Rockwell Automation Publication 1768-UM002C-EN-P - April 2012 85
Develop Safety Applications Chapter 6
8. Enter the requested packet interval (RPI) for the connection in 1 ms
increments.
The default is 20 ms.
The RPI specifies the period at which 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, an
acceptable Connection Reaction Time Limit can be achieved 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, you can reset the Max Network Delay by clicking Reset Max.
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