Rockwell Automation 20-COMM-I Interbus Adapter - Manual (Page 74)

6-12 Using Explicit Messaging (PCP Communications)
Write Examples:
Writing Pr. 106 [Preset Speed 6] to a PowerFlex 70 (DPI Host)
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
12394
2
0
0
8
-32,760
CR# = 2 (Station 1.0)
Sub Index not used
Number of words following = 2
CR# = 2 (Station 1.0)
306A
2
0
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)
3001h is the start of PowerFlex 70 parameters (Pr.1)
Index = 3000h+6Ah = Parameter 106 [Preset Speed 6]
6A hex = 106 dec = Parameter 106 [Preset Speed 6]
Echo of the Command Word (PCP Write)
N23:14
N23:15
2
123 7B
2
Data word 2 not used
Data word 1 = 123 = 12.3 Hz
2 bytes of data following
Message
CR# =2 (Station 1.0) N23:0 Request 2 2
SLC Address Descr
iption
Value (He
x)
N23:1 0 0= PowerFlex 70 (DPI Host) 0
Value (Dec)
N23:2 106 6A Parameter # = 106
N23:3
N23:4
2
123
0
2
7B
0
2 byte data write
Data Word 1 = 123 = 12.3 Hz
Data Word 2 not used N23:5
20COMM-UM007A-EN-P.book Page 12 Tuesday, January 22, 2002 10:52 AM