Rockwell Automation T8017 Trusted Peer to Peer Communications - Manual (Page 11)

Trusted
TM
Communication Software Package T8017
Issue 10 Mar 08 PD-T8017 11
2. Programming Information
The Trusted TM communications interface modules are selected and assigned to peer communications
using the I/O Configuration Editor at the Engineering Workstation (EWS) as described in PD-8082. It
should be noted that the (OEM) parameters set up on all board / rack definitions cannot be changed
online. General information relating to configuring the modules is detailed below.
2.1. Peer Subnet Control
This board definition configures and controls a peer controller for one subnet within a peer network.
The definition also provides status for up to forty possible peer controllers (including itself).
A peer controller must be allocated to a communication interface. No more than one controller should
be active at any one time for each physical Ethernet port of a communication interface.
Each peer controller may have up to forty peer controllers configured including itself. These may
represent either actual or multicast IP addresses representing one peer or a group of peer controllers,
respectively.
Peer controllers can only communicate with other peer controllers that share the same network and
subnet identity. Each set of communicating controllers represents one subnet of a peer network which
may consist of up to 8 subnets that provide redundant routing for I/O board data.
Each peer subnet control board defines the IP addresses of all the peer controllers on the subnet.
Each peer controller has a peer ID, allocated according to the position of its IP address in the peer
subnet control board parameters. The configuration of IP addresses must be the same across all peer
subnet control boards sharing the same network because the configuration is used to set the Peer ID
number.
A Multicast peer address must be in the range 239.255.0.0 to 239.255.255.255 for a local site. This
range prevents the messages from being forwarded by a router outside the immediate network. Other
addresses may be used, but these will be forwarded outside the immediate network. A limit may be set
of the number of routers that will forward the data.
Note that Multicast operation must be configured in the System INI configurator. Refer to PD-T8151B
for details.
Peer subnet control boards must be defined before their respective input/output boards in the I/O
connection editor.