Rockwell Automation T8xxx Trusted Communications Interface - Manual (Page 24)

Trusted
TM
Communication Interface T8151B
Issue 21 Apr 10 PD-T8151B 24
3.5.1. Modbus Master Configuration
Create a new Modbus Master by clicking ‘+ Add Master’. This enables the controls to remove the
master, add a slave responding to that master, and to remove a slave. The three configuration tabs
(Configuration, Broadcast and Statistics) are now available for the new master. The master name can
be changed by double clicking on the name or clicking on ‘Change Name’. ‘Save’ stores changes
made so far, and ‘Undo’ loads the last saved state. ‘Validate’ will check the settings for any obvious
errors and omissions (but will not guarantee it will work).
Figure 6 Modbus Master Configuration
3.5.2. Configuration Tab
The Configuration tab for a Modbus Master includes the communications settings and controls for the
Master.
Communications Link: This defines the physical communications link that will be used for this Modbus
Master device. Select Ethernet or Serial. For Ethernet, enter the IP address of the Communication
Interface port to be used, and the TCP/IP port number (1000 by default). For Serial, choose the port to
be used. The actual serial parameters are as defined in the Communications Interface Configuration
screen.
Timeout: The timeout section sets the communications timeout for the link. This is used to decide how
long to wait before deciding that a slave device is not responding.
Every Modbus Master and associated slave in the system can have a control and status register
defined. These allow each device to be controlled and status information retrieved via the application.
Communications control: The communications control section defines the Modbus address of the
application variable that will be used to control the Master device. If the Master device is not controlled
by the application then the check box should be left unchecked.
Status reporting: The Status reporting section defines the Modbus address of the application variable
that will be used to report the status of the communications link to the application. If status reporting is
not required then the check box should be left unchecked.