Rockwell Automation 1756-SYNCH ControlLogix SynchLink Module User Manual - Manual (Page 41)

Publication 1756-UM521C-EN-P - July 2004
SynchLink Module Features 3-13
The Electronic Keying feature is configured on the following screen.
Requested Packet Interval
The Requested Packet Interval (RPI) is a configurable parameter that
defines when the module multicasts its data onto the local chassis
backplane. In the SynchLink module, though, the RPI’s role is dictated
by the data the SynchLink transfers.
Axis Data
The RPI does not have an effect on produced or consumed axis data.
In a distributed motion control application, the coarse planner update
establishes the timing of the axis data updates from the producing
controller to the consuming 1756-SYNCH module in the master
chassis. Likewise, in the slave chassis, the RPI parameter does not
affect the delivery of the axis data to the consuming processor. This
data is produced at the coarse update rate established in the master
chassis.
Electronic Keying