Rockwell Automation 20-COMM-P Profibus Adapter - Manual (Page 82)

6-12 Using Explicit Messaging (Parameter Protocol)
Figure 6.5 Example SLC Ladder Logic - Station 1 Parameter Protocol (Continued)
N10:10 is the Station 1 Response Parameter Access Word 1. It is < > 0 when a message has been received in response to a
message request. If the response is >= 7000 hex (28672 decimal), then the adapter is responding that an error has occurred. In
this case, the returned data in the response will contain a fault code and not parameter value data.
The response message can be found at:
N7:20 = PCA word = contains the RC and PNU
N7:21 = Subindex = the DPI port # ("0"= Host or PowerFlex drive, "5" = 20-COMM-P, etc.)
N7:22 = PVA #1 = the parameter value (high word)
N7:23 = PVA #2 = the parameter value (low word)
The PVA's will either contain parameter read data, echo the parameter write data, or contain an error code if unsuccessful.
0017
B3:19
15
Station 1
Par Prot
Messaging
Request
NEQ
Not Equal
Source A
N10:10
0<
Source B
0
0<
Station 1
RESPONSE
PCA Word
COP
Copy File
Source
#N10:10
Dest #N7:20
Length 4
COP
RESPONSE Message
PCA Word
MOV
Move
Source
0
0<
Dest
N20:10
0<
MOV
Station 1
PCA Word
U
B3:19
15
Station 1
Par Prot
Messaging
Request
0018 END
20COMM-UM006A-EN-P.book Page 12 Friday, September 28, 2001 10:43 AM