Rockwell Automation RECOMM-IBUS Interbus Communications Module - Manual (Page 72)

7-12 Interbus Communications Module
Note that writing to parameters causes a non-volatile storage (NVS)
write cycle and therefore must NOT be done frequently (can exceed
the maximum number of allowable write cycles and cause the
product to malfunction).
Write Examples:
Table 7.12 – PCP Write Subroutine Reply Message
Register Description
N23:20 = PCP Status Word.
N23:21 = Echo of the Command word (0008h).
N23:22 = Number of words following.
N23:23 = CR.
N23:24 = Result (“0” = good).
Figure 7.6 – Writing Preset Speed 6 (106) to an SP600 Drive (DPI Host)
Message
Command word = 8 = PCP Write (bit 3 ON) N23:10 Command 8 8
SLC Addr
ess
D
es
cr
iption
Va
lu
e
(H
ex)
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
Va
lu
e
(D
ec
)
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
Index = 3000h + 6Ah = Preset Speed 6 (106)
3001h is the start of SP600 parameters (1)
6A hex = 106 dec = Preset Speed 6 (106)