Rockwell-automation RECOMM-DNET DeviceNet Adapter for use with DPI AC Manual de usuario Pagina 50

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5-4
DeviceNet Adapter for use with DPI AC Drives
Step 8. Select the type(s) of data exchange (Polled, Change of
State, and /or Cyclic). In our example, we selected Polled.
Step 9. Type the number of bytes that are required for your I/O in
the Rx Size and Tx Size boxes. The size will depend on
the following:
I/O that you enabled in the adapter. This information can
be found in DPI I/O Active (14) in the adapter.
Size of the Reference/Feedback and Datalinks in your
drive. This information can be viewed using Ref/Fdbk
Size (7) and Datalink Size (8) in the adapter. A 16-bit
word is two bytes, and a 32-bit word is four bytes.
The actual size value used in the Rx Size box can be
determined by the setting of the M-S Input parameter as
shown in table E.1 or table E.2 for “Poll Only.”
The actual size value used in the Tx Size box can be
determined by the setting of the M-S Output parameter as
shown in table E.3 or table E.4 for “Poll Only.”
Tables 5.1 and 5.2 show common configuration Tx/Rx
sizes.
In our example, we typed 4 in the Rx Size and Tx Size boxes
because we enabled only the Logic Command/Status for I/O in the
adapter and our drive uses a 16-bit Reference/Feedback.
Both the M-S Input and M-S Output parameters are set to 00001.
Therefore, the Logic Command/Status uses 2 bytes and the
Reference/Feedback uses 2 bytes totaling 4 bytes.
Table 5.1 – Host Products Using 16-Bit Reference/Feedback & Datalinks
1
1
SP600 drives use 16-bit datalinks.
Rx
Size
Tx
Size
Logic
Command/
Status
Reference/
Feedback
(16-bit)
Datalinks (16-bit)
ABCD
44
✔✔
88
✔✔
12 12
✔✔
16 16
✔✔✔
20 20
✔✔✔✔
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