Rockwell Automation 20-COMM-P Profibus Adapter - Manual (Page 79)

Using Explicit Messaging (Parameter Protocol) 6-9
Writing Parameter 101 [Preset Speed 1] to the PowerFlex 70
(DPI Port 0)
Request Response
RC
“2” (‘0010’ binary) to write a 8-bit or 16-bit
parameter
“3” (‘0011 binary) to write a 32-bit
parameter
RC
“1” (0001’) Transferring a 8-bit or 16-bit
parameter value
“2” (‘0010’) Transferring a 32-bit parameter
value
“7” (‘0111’) Request rejected (including fault
number)
SPM
Not used
SPM
Not Used
PNU
Parameter number being written
PNU
Confirms the Parameter number (equals the
PNU from the request)
Subindex
Selects which DPI port to talk to (“0”= DPI
Hosts “5”= 20-COMM-P on PowerFlex 70)
Subindex
Confirms the DPI Port (equals the Subindex
from the request)
Parameter value high
Contains the high word if writing a 32-bit
parameter
Parameter value high.
Confirms the high word if writing a 32-bit
parameter.
Parameter value low
Contains the write value for a 8-bit or 16-bit
parameter, or the low word if writing a 32-bit
parameter
Parameter value low.
Confirms the write value for a 8-bit or 16-bit
parameter, the low word (if writing a 32-bit
parameter, or the fault code (if RC=”7”)
Confirms Par. Access Word 2 of the request
Message
2000 hex = Change parameter value (word)
N20:10 Command 2065 1
P
ar
. Access
W
ord
SLC Address Descr
iption
Value (he
x)
N10:12
N20:13
N20:12
N20:11
N10:10
N10:13
Reply
3
2
2
1
4
4
3
DPI Port 0 (DPI Host)
Not Used
64 hex = 100 dec = 10.0 Hz
Confirms Par. Number of the request ("65")
Transferring 16-bit parameter value ("1")
Not Used
Confirms Param. Access Word 4 of the request
65 hex = 101 dec (Pr.101)
1065
0
0
0
64
0
N10:11
64
20COMM-UM006A-EN-P.book Page 9 Friday, September 28, 2001 10:43 AM