Rockwell Automation 20-COMM-P Profibus Adapter User Manual
Page 74
6-4
Using Explicit Messaging (Parameter Protocol)
R
efer to
for a description of the data that is
required in each word.
Parameter Message Request
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 20-COMM-P module can be determined from Parameter 01 - [DPI
PORT]. This is Port 5 on PowerFlex 70 and PowerFlex 700.
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.
20COMM-UM006A-EN-P.book Page 4 Friday, September 28, 2001 10:43 AM