Rockwell Automation 20-COMM-I Interbus Adapter - Manual (Page 81)

Using Explicit Messaging (PCP Communications) 6-19
PCP Write Subroutine (Explicit Messaging)
The PCP Write Subroutine is executed from the Main Program (Chapter
5) by turning on bit B3:47/10. Only one PCP Read or Write can be
performed at any one time. B3:47/10 will be turned off by the subroutine
when the reading is complete and signals that another read (or write)
cycle can take place.
Figure 6.4 LAD6 - PCP Write Subroutine
N23:10 = PCP Command Word (Set to "8" to cause a PCP Write: an "8" = bit 3 ON)
0000
B3:47
11
PCP Write
Routine
1-shot
MOV
Move
Source
8
8<
Dest
N23:10
8<
MOV
PCP
Command
Word
N23:11 = CR (The Communication Reference to write to. A unique CR is the established for each Station)
"2" = CR 2 = Station 1.0
"3" = CR 3 = Station 2.0
0001
B3:47
11
PCP Write
Routine
1-shot
MOV
Move
Source
N23:0
2<
Dest
N23:11
2<
MOV
PCP Write
Command Msg
CR
N23:12 = Index
N23:1 determines what area is to be written to:
0 = PowerFlex 70 (Host) parameter (N23:2 + 12288 decimal (3000h) = mapped parameter address)
1 = 20-COMM-I parameter (N23:2 + 12213 decimal (2FB5h) = mapped parameter address)
0002
B3:47
11
PCP Write
Routine
1-shot
EQU
Equal
Source A
N23:1
0<
Source B
0
0<
EQU
PCP Write
Parameter Area
to Write
ADD
Add
Source A
N23:2
107<
Source B
12288
12288 <
Dest
N23:12
12395 <
ADD
PCP Write
Command Msg
Index
EQU
Equal
Source A
N23:1
0<
Source B
1
1<
EQU
PCP Write
Parameter Area
to Write
ADD
Add
Source A
N23:2
107<
Source B
12213
12213 <
Dest
N23:12
12395 <
ADD
PCP Write
Command Msg
Index
N23:13 = Sub Index (Not used)
0003
B3:47
11
PCP Write
Routine
1-shot
MOV
Move
Source
0
0<
Dest
N23:13
0<
MOV
PCP Write
Command Msg
Sub Index
20COMM-UM007A-EN-P.book Page 19 Tuesday, January 22, 2002 10:52 AM