Rockwell Automation PLC-5 Fieldbus Solutions for Integrated Architecture User Manual - Manual (Page 172)

Publication 1757-UM006A-EN-P - May 2002
7-12 Using the 1788-CN2FF, ControlNet-to-FOUNDATION Fieldbus H1 Linking Device
Configuration of Discrete Outputs
The NI-FBUS Configurator lists all the devices and the function blocks
in each device in its browse window. This includes the DO function
blocks in the Fieldbus devices and the MDO function blocks in the
linking device. You must connect the Fieldbus DO function blocks
that will be controlled by the ControlNet controllers (or devices) to the
MDO channels.
Figure 7.8 Sample Cascade DO Configuration
The configuration shown in Figure 7.8, the controller provides the
necessary mode handshake for cascade initialization of the DO block.
In this case, you connect CN_OUT_Dx of the MDO block to the
CAS_IN_D parameters of the DO block, and the BKCAL_OUT_D
parameter of the DO block to BKCAL_INn of the MDO block. Note
that there is a strict ordering relationship between the CN_OUT_Dx
and CN_BKCAL_IN_Dx parameters of the MDO block, that is,
CN_BKCAL_IN_D0 is associated with CN_OUT_D0,
CN_BKCAL_IN_D1 with CN_OUT_D1, and so on.
You can connect the MDO block to any parameter that is a byte value
and status combination. In other words, you can bring values from a
PLC processor to any function block. The MDO block is not limited to
interfacing with DO function blocks.