Rockwell Automation PLC-5 Fieldbus Solutions for Integrated Architecture User Manual - Manual (Page 176)

Publication 1757-UM006A-EN-P - May 2002
7-16 Using the 1788-CN2FF, 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 7.10.
To print the Device Info, put the cursor on the display of the Device
Info that is shown in Figure 7.10, 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.