Rockwell Automation GV3000/SE AC Drive ControlNet Network Communication Board, M/N 2CN3000 - Manual (Page 72)

4-10 GV3000/SE AC Drive ControlNet Network Communication Option Board
4.3.6 Using the Drive Reference and Feedback Data (N12:X)
When you use scheduled data transfers to transmit less than six words of either drive
reference or feedback data, you can access the information that is not transmitted as
scheduled data by using unscheduled data transfers. Use a MSG instruction to access
any or all of the data, except the drive control word, which is read only. See chapter 5
for a complete listing of the data you can access and its location.
4.3.7 Using the Write Status File (N20:X) to Troubleshoot a Drive
Parameter Write Command
You can troubleshoot errors that may occur when you write values to parameters in
the drive. The drive may not accept the values because the drive is running or the
value is less than the minimum value or greater than the maximum value. When this
occurs, the MSG instruction’s ER coil is set and an error code is written into an
element in N20 that corresponds to the drive parameter’s location in N10. Each
element in file the N20 corresponds to an element in file N10. For example: N10:0
stores the Control Source parameter data (P.000). If you were writing a value to N10:0
and an error occurred, you could read N20:0 and determine that an error occurred
when writing to parameter P.000.
See table 6.3 for the error codes that the drive will return to the PLC when a Typed
Read or Typed Write message fails.