Rockwell Automation RECOMM-DNET DeviceNet Adapter for use with DPI AC Drives - Manual (Page 58)

6-4 DeviceNet Adapter for use with DPI AC Drives
6.3 Using Logic Command/Status
When enabled, the Logic Command/Status word is always word 0 in
the I/O image. The Logic Command is a 16-bit word of control
produced by the scanner and consumed by the adapter. The Logic
Status is a 16-bit word of status produced by the adapter and
consumed by the scanner.
This manual contains the bit definitions for compatible products
available at the time of publication in Appendix D, Logic
Command/Status Words. For other products, refer to the
corresponding documentation.
6.4 Using Reference/Feedback
When enabled, Reference/Feedback always begins at word 1 in the
I/O image. The Reference (16 bits or 32 bits) is produced by the
controller and consumed by the adapter. The Feedback (16 bits or
32 bits) is produced by the adapter and consumed by the controller.
The size of the Reference/Feedback is determined by the drive and
displayed in Ref/Fdbk Size (7) in the adapter.
6.5 Using Datalinks
A Datalink is a mechanism used by SP600 drives to transfer data to
and from the controller. Datalinks allow a parameter value to be
changed without using an Explicit Message.
When enabled, each Datalink occupies two 16- or 32-bit words in
both the input and output image. Datalink Size (8) will indicate
whether the drive uses 16- or 32-bit words for Datalinks.
6.5.1 Rules for Using Datalinks
Note the following regarding the use of Datalinks:
• Each set of Datalink parameters in a SP600 drive can be used by
only one adapter. If more than one adapter is connected to a
single drive, multiple adapters must not try to use the same
Datalink.
• Parameter settings in the drive determine the data passed
through the Datalink mechanism. Refer to the documentation for
your drive.
• When you use a Datalink to change a value, the value is not
written to the non-volatile storage (NVS). The value is stored in
volatile memory and lost when the drive loses power.
Size Valid Values In I/O Image Example
16-bit -32768 to 32767 Word 1 Figure 6.1
32-bit -2147483648 to
2147483647 Word 1 and Word 2 Figure 6.2