Rockwell Automation RECOMM-PBUS PROFIBUS Communications Module - Manual (Page 89)

Using Explicit Messaging (Parameter Protocol) 7-15
l
Figure 7.12 – Sample SLC Ladder Logic - Station 2 Parameter Protocol (Continued)
N10:24 is the Station 2 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 module 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:
N7:40 = PCA word = contains the RC and PNU
N7:41 = Subindex = the DPI port # ("0"= Host or SP600 drive, "5" = RECOMM-PBUS, etc.)
N7:42 = PVA #1 = the parameter value (high word)
N7:43 = 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
0
Station 2
Par Prot
Messaging
Request
NEQ
Not Equal
Source A
N10:24
0<
Source B
0
0<
Station 2
RESPONSE
PCA Word
COP
Copy File
Source
#N10:24
Dest #N7:40
Length 4
COP
RESPONSE Message
PCA Word
MOV
Move
Source
0
0<
Dest
N20:24
0<
MOV
Station 2
PCA Word
U
B3:19
0
Station 2
Par Prot
Messaging
Request
0018 END