Rockwell Automation RECOMM-DNET DeviceNet Adapter for use with DPI AC Drives - Manual (Page 50)

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)
A B C D
4 4 ✔ ✔
8 8 ✔ ✔ ✔
12 12 ✔ ✔ ✔ ✔
16 16 ✔ ✔ ✔ ✔ ✔
20 20 ✔ ✔ ✔ ✔ ✔ ✔