Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 186)

186 Publication 1753-UM001C-EN-P - March 2010
Chapter 17 Configure Peer-to-Peer Communication
Choose a Peer-to-peer Profile
1. Click in the Profile column and choose one of the profiles.
Make sure that the profile is suitable for your network topology
and matches the HH profile.
See page 161 for a detailed description of all the profiles.
2. Click outside the table or press the Return key to activate the
selection.
The profile of the return path is automatically updated with the
new profile.
Define Peer-to-peer Parameters
The most important timing parameter of a safety related installation is
the Safety Time. Safety Time is the time a process can run with
incorrect controller outputs without affecting the safety of the process.
See the GuardPLC Controller Systems Safety Reference Manual,
publication
1753-RM002 for more details on the Safety Time.
The Worst Case Reaction Time (T
R
) is the time within which two
linked controllers must detect the occurrence of a physical input
signal at PES
1
and put out the resulting physical output signal at PES
2
.
To guarantee the integrity of the application, the requirement below
must always be fulfilled.
T
R
< Safety Time
When you choose a peer-to-peer profile, most parameters are
automatically preset. Because ReceiveTMO (safety-relevant) is part of
the Worst Case ReactionTime T
R
(see Peer-to-peer Protocol Parameters