Rockwell Automation AADvance Controller Solutions Handbook - Manual (Page 32)

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1-20 Document: 553631
(ICSTT-RM447J_EN_P) Issue: 09:
Solutions Handbook (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 only.
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.