Rockwell Automation AADvance Controller Safety Manual - Manual (Page 54)

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3-20 Document: 553630
ICSTT-RM446K-EN-P Issue: 10 _C
Safety Manual (AADvance Controller)
Peer-to-Peer
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 TM 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
next and all slaves in turn. Finally the master transmits its own data then
repeats the cycle with the slaves.