Rockwell Automation PLC-5 Fieldbus Solutions for Integrated Architecture User Manual - Manual (Page 290)

Publication 1757-UM006A-EN-P May 2002
F-42 1788-CN2FF Installation Example
Figure F.5 ControlNet Module Properties
There are several parameters to note on this window:
Comm
The Comm Format is Data-DINT.
Assembly Instance
The Assembly Instance values must be set as shown in Figure F.5.
Input Size
Look back at the Device Info in the Configuration software. Notice
that an Analog input repeats every 8 bytes. Therefore, you want an
input area x times 8 where x is something greater than the number of
Analog inputs that you expect may be connected to the CN2FF.
When you look at the data transmission that the CLX receives from the
CN2FF, you’ll see that there is nothing in the first 4 bytes. That is
because there is four bytes of pad in front of the first data
Output Size
The output size is set to 1 since a generic connection requires at least
one word of output. We are not using any outputs in this lab.
5. Select Next and set the RPI rate to 40 ms.