Peer-To-Peer - Allen-Bradley AADvance T9110 Safety Manual

Chapter 3 AADvance System Architectures
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Peer-to-Peer

WARNING: Peer-to-Peer functionality cannot be used in conjunction with
AADvance Workbench 2.0, and is therefore not available for use in a safety
related system. However, Peer-to-Peer functionality is available for
AADvance Workbench 2.1 toolkit and subsequent revisions to be used in
safety related systems.
It is the end users responsibility to ensure that any pre-existing Peer-to-Peer
configuration is removed before importing an application developed under
Workbench 1.3 into Workbench 2.0.
AADvance provides the capability for a SIL 3 certified Peer-to-Peer data
connections, allowing safety data to be transferred between AADvance and
Trusted Controllers. The Trusted Peer-to-Peer network protocol enables you
to share safety data between AADvance systems or AADvance and Trusted
systems across an Ethernet network. Data can be transferred between
individual systems or from one to several systems at the same time using
multicast network connections. Peer-to-Peer communication is configured by
defining a peer network controller and I/O devices within the application
program.
Note: AADvance currently supports multicast network connections on the
left most port of each processor.
For safety related applications it is recommended that the Peer-to-Peer
communications use redundant networks (for availability) and separate
networks (from general purpose, for security and integrity). Any of the
AADvance or Trusted ports can be used for Peer-to-Peer data connections see
Example shown.
The Trusted Peer-to-Peer protocol is a master/slave interaction. For each peer
communications subnet one system acts as a master while the others act as
slaves. During the Peer-to-Peer communication cycle the master sends a
command to the first slave to transmit its data. When the slave completes this
task it acknowledges this back to the master. The master repeats this with the
Rockwell Automation Publication ICSTT-RM446N-EN-P - April 2018