Rockwell Automation 1788-CN2FF ControlNet-to-FOUNDATION Fieldbus H1 Linking Device User Manual - Manual (Page 42)

1788-6.5.1 - January 1999
4-16 Using the ControlNet-to-FOUNDATION Fieldbus H1 Linking Device
MDI Blocks
For each MDI block configured in the linking device beginning with the
lowest numbered module, each channel that is connected to a Fieldbus
function block has attributes 3, 4, and 150 placed into the required input
assembly object. Each MDI requires 4 bytes in the input assembly object.
MDO Blocks
For each MDO block configured in the linking device beginning with the
lowest numbered module, each channel that is connected to a Fieldbus
function block has attributes 3, 4, and 155 placed into the required output
assembly object. Additionally, if your controller participates in cascade
initialization for a specific channel (wiring BKCAL_OUT_D from DO),
attribute 154 is placed into the required input assembly. Each MDO channel
requires 2 bytes in the input assembly object, and 4 bytes in the output
assembly object, if cascade initialization is performed—2 bytes if cascade
initialization is
not performed.
Viewing Object Information in the NI-FBUS Configurator
The NI-FBUS Configurator can display information about the ControlNet
objects created inside the linking device. This information contains the
layouts and instance numbers of the input and output assembly objects as
well as instance numbers of the base ControlNet objects created. To display
this information, view the Device Info for the linking device in question.
You can view the Device information in the NI-FBUS Configurator from
the browse window. A sample Device Info display is shown in Figure 4.11.
To print the Device Info, put the cursor on the display of the Device Info
that is shown in Figure 4.11, and click on Print, under the File menu. Note,
if the cursor is not on the Device Info display, when you click on Print, you
will be given an extensive menu of other items that you may print, but no
listing for the Device Info.