Rockwell Automation 20-COMM-I Interbus Adapter - Manual (Page 69)

Using Explicit Messaging (PCP Communications) 6-7
Read Examples
Reading Pr. 140 [Accel Time 1] from 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 Read:
Echo of the Command Word (PCP Read)
Message
Command word = 4 = PCP Read (bit 2 ON) N22:10 Command 4 4
SLC Address Descr
iption
Value (He
x)
N22:22
N22:13
N22:12
N22:11
N22:23
Reply
12428
2
4
-32,764
0
2
4
CR# = 2 (Station 1.0)
Sub Index not used
Number of words following = 4
CR# = 2 (Station 1.0)
308C
2
4
2
4
N22:21
0
8004
Value (Dec)
N22:20
Result = 0 (success)
N22:25
N22:26
0
50
2 Number of bytes read = 2
Data word 2 not used
0
32
2
N22:24
N22:27 0 0
"8000" (bit 15 ON) indicates Reply message present
Status word:
"0004" (bit 2 ON) echo's the command (PCP Read)
3001h is the start of PowerFlex 70 parameters (Pr.1)
Index =3000h+8Ch = Parameter 140 [Accel Time]
8C hex = 140 dec = Parameter 140 [Accel Time]
Data word 1 = 32 hex = 50 dec = 5.0 seconds
Message
CR# =2 (Station 1.0) N22:0 Request 2 2
SLC Address Desc
ription
Value (He
x)
N22:1 0 0= PowerFlex 70 (DPI Host) 0
Value (Dec)
N22:3 140 8C Parameter # = 140 [Accel Time]
20COMM-UM007A-EN-P.book Page 7 Tuesday, January 22, 2002 10:52 AM