Rockwell Automation 20-COMM-I Interbus Adapter - Manual (Page 76)

6-14 Using Explicit Messaging (PCP Communications)
Writing Pr. 12 [Flt Cfg A1] to a 20-COMM-I
In the example ladder logic program, the user would load these
registers before calling the subroutine to perform the PCP Write:
Message
Command word = 8 = PCP Write (bit 3 ON) N23:10 Command 8 8
SLC Address Descr
iption
Value (He
x)
N23:20
N23:13
N23:12
N23:11
N23:21
Reply
2
2048
0
8
-32,760
CR# = 2 (Station 1.0)
Sub Index not used
Number of words following = 2
CR# = 2 (Station 1.0)
2FC1
2
800
8
8008
N23:16
0
Value (Dec)
Result = 0 (success)
N23:23
0
2
2
0
2
2 N23:22
N23:24
"8000" (bit 15 ON) indicates Reply message present
Status word:
"0008" (bit 3 ON) echo's the command (PCP Write)
2FB6h is the start of the 20-COMM-I parameters (Pr.1)
Index = 2FB5h+Ch = Parameter 12 [Flt Cfg A1 In]
C hex = 12 dec = Parameter 12 [Flt Cfg A1 In]
Echo of the Command Word (PCP Write)
N23:14
N23:15
4
0 0
4
00000800 hex = 2048 decimal
4 bytes of data following
12225
Message
CR# = 2 (Station 1.0) N23:0 Request 2 2
SLC Address Desc
ription
Value (He
x)
N23:1 1 1= 20-COMM-I 1
Value (Dec)
N23:2 12 12 Parameter # = 12
N23:3
N23:4
N23:5
4
0
2048
4
0
800
4 byte data write
Data Word 1 = 0
Data Word 2 = 2048
20COMM-UM007A-EN-P.book Page 14 Tuesday, January 22, 2002 10:52 AM