Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 176)

176 Publication 1753-UM001C-EN-P - March 2010
Chapter 17 Configure Peer-to-Peer Communication
Set Peer-to-Peer Controller
Properties Right-click Resource and choose Properties to set the timing
parameters and switches according to the requirements of your
application.
The Communication Time Slice and Code Generation Version settings
are needed for peer-to-peer network parameterization.
Communication Time Slice
The Communication Time Slice is the time in milliseconds reserved for
a controller to carry out and complete all communication tasks in one
CPU cycle.
The minimum Communication Time Slice depends on the number of
communication connections (n) a controller has.
The minimum Communication Time Slice (CTS
min
) is calculated as
follows.
For n
≤
13: CTS
min
(n
≤
13) = n x 1 ms + 4 ms
For n > 13: CTS
min
(n > 13) = n x 1.3 ms
IMPORTANT
Do not set the Communication Time Slice below the calculated
value. If the Communication Time Slice is too small, it takes
more than one CPU cycle to carry out the pending
communication tasks. Therefore, more time is needed to
complete the communication tasks, which degrades
performance and could result in a communication shutdown
due to a communication timeout (ReceiveTMO).