Rockwell Automation RECOMM-PBUS PROFIBUS Communications Module - Manual (Page 78)

7-4 PROFIBUS Communications Module
7.3.1 Parameter Message Request
Table 7.1 – Parameter Message Request Data
Word Description
1 PNU - Parameter Number (Bit 0-10)
The parameter number determines which parameter to
access in the selected peripheral. Parameters 1-1023 can
be accessed.
Parameter numbers 1024 - 2048 are used to access the
fault object. Parameter 1024 is equal to the latest fault, 1025
to the prior fault, and so on.
SPM (Bit 11)
Reserved - Should always bet set to 0.
RC - Request Code (Bit 12-15)
One of the following codes have to be used:
0 = No request
1 = Request parameter value
2 = Change parameter value (8-bit & 16-bit word)
3 = Change parameter value (32-bit word)
4 -15 = Reserved
2 IND - Index
The index word contains the DPI port number of the DPI
peripheral that the request is addressed to. The drive
always has port number 0. The port number of the
PROFIBUS module can be determined from parameter 1
(DPI Port). This is Port 5 on SP600 drives.
3 PVA - Parameter value (32-bit high word)
The parameter value, if the parameter is 32 bits, the most
significant bytes are placed here.
4 PVA - Parameter value (32-bit low word or 8-bit & 16-bit
word).
The parameter value. If the parameter is 32 bits, the least
significant bytes are placed here. If the parameter is 16-bit
or lower, the entire result is placed in this word.