Rockwell Automation T8xxx Trusted Communications Interface - Manual (Page 23)

Trusted
TM
Communication Interface T8151B
Issue 21 Apr 10 PD-T8151B 23
3.5. Modbus Master
The Trusted TM Communications Interface may also act as a Modbus Master with the addition of the
Processor Interface Adapter T8122 or T8123. See Product Description PD-T812x for details.
On a system without the appropriate Processor Interface Adapter connected, the Modbus Master may
be configured and downloaded into the Trusted
TM system. However, no communications activity will
take place once the system is running.
Modbus Master operates on the Communications Interface. It is capable of linking to a wide range of
external devices using either serial or Ethernet links, supporting the Modbus RTU protocol (Modicon
Open Modbus TCP is not supported).
Clicking ’Configure Modbus Master’ opens the Master configuration window.
Figure 5 Modbus Master Configuration Window
The Modbus Master configuration is hierarchical. The first step is to configure a master, then to
configure the slaves serving that master, then configure the messages carrying data to and from each
slave.