Rockwell Automation T8017 Trusted Peer to Peer Communications - Manual (Page 14)

Trusted
TM
Communication Software Package T8017
Issue 10 Mar 08 PD-T8017 14
2.2. Peer to Peer Data Boards
There are four different peer input boards (two analogue and two digital) that can be selected to ensure
that the optimum communication packet size can be used for the application. Each input board has a
corresponding output board that must be of the same type and channel quantity.
There are two versions of the analogue data boards, a 16 channel version and a 128 channel version.
Both are configured the same. They only differ in the number of data channels supported. Similarly
there are 16 and 128 channel versions of the digital channel boards.
Each output board delivers data to one or more input boards across one peer network. Note that the
subnet of the peer network used to send the data is transparent to the input and output boards. More
than one subnet may be defined using Peer Subnet Control boards to provide redundant
communications. Peer subnet control boards must be defined before their respective input/output
boards in the I/O connection editor.
Note that for a Peer output to communicate with a Peer input, they must share the same network
number (NETWORK_ID), reference each others’ peer numbers (TARGET_PEER_ID and
SOURCE_PEER_ID) and have the same data block number (SOURCE_DATA_ID). The combination
of these three identities should be considered as a global data identifier which must be uniquely
defined across the entire peer network for each I/O board pair. The SOURCE_DATA_ID must be
unique for all peer traffic between any two peers. It is recommended to set different
SOURCE_DATA_IDs for each output block within each network in each system; this will ensure that
they are unique at all destinations.