Rockwell Automation 22-COMM-P PowerFlex Profibus Adapter - Manual (Page 52)

5-2 Using I/O Messaging
The Profibus specification requires that the terms input and output be
defined from the scanner’s point of view. Therefore, Output I/O is data
that is output from the scanner and consumed by the Profibus adapter.
Input I/O is status data that is produced by the adapter and consumed as
input by the scanner. The I/O image table will vary based on the:
• Configuration of the Mode Jumper (J2) on the adapter and
Parameter 11 - [DSI I/O Cfg]. The image table always uses
consecutive words starting at word 0.
Figure 5.1 illustrates an example of an I/O image (16-bit words) for the
adapter operated in Single mode.
Figure 5.1 Example of I/O Image for Adapter in Single Operating Mode
Single operating mode is the typical configuration, where one node
consists of a PowerFlex 40, PowerFlex 40P or PowerFlex 400 drive with
a 22-COMM-P adapter.
For Multi-Drive mode, where one node can consist of up to 5 drives,
refer to
Chapter 7 , Using Multi-Drive Mode .
Understanding the I/O Image
Controller Scanner Adapter PowerFlex
4-Class Drive
Profibus DSI
Output
Image
(Write)
Input
Image
(Read)
Message
Handler
Message
Buffer
0 Logic Status
1 Feedback Logic Status
Feedback
Word and I/O
Message
Handler
0 Logic Command
1 Reference Logic Command
Reference