Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 669)

OCI Parameters
Chapter 38
38-3
Function
Use this parameter to specify the frequency at which the control passes
updated information to the OCI station. This parameter specifies the
shortest amount of time that can pass between control updates to the OCI
station. The actual time between updates may be greater than the
minimum time configured here because of higher priority tasks being
executed by the 9/Series processor or in the event that there is no new
changed data to transmit. Data items values on the watchlist are only
transmitted when its value changes.
Selecting a longer minimum duration will reduce traffic on your network.
Selecting a shorter minimum duration will increase OCI performance for
time critical OCI applications.
Axis
Parameter
Number
All [333]
Range
20 to 3000 milliseconds
Notes
This is a global parameter; the value set here applies to all axes.
We recommend keeping this parameter equal to or greater than the
“Monitor Frequency for Changes” parameter. Following this
recommendation will allow the system to buffer up changes and send
larger packets of data each transmit cycle improving system and network
performance.
38.2
CNC- OCI Data Transfer Rate