Rockwell Automation MD65 Profibus Communication Card - Manual (Page 53)

Using I/O Messaging 6-3
6.4 Using Reference/Feedback
When enabled, Reference/Feedback always begins at word 1 in the
I/O image. The Reference (16 bits) is produced by the controller
and consumed by the module. The Feedback (16 bits) is produced
by the module and consumed by the controller.
Size Valid Values 1
1 The Reference for a MD65 or MD60 is set in Hz. For example, “300”
equates to 30.0 Hz (the decimal point is always implied).
In I/O Image Example
16-bit 0.0 to 4000
0.0 to 240.0 Hz (MD60) or
0.0 to 400.0 Hz (MD65) Word 1 Figure 6.1