Rockwell Automation 1771-KA2 Communication Adapter Module - Manual (Page 58)

Communication Zone Rungs
Chapter 5
5-6
Figure 5.3
Memory Access Example
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Memory Access
Boundaries in
Local Station
Data Table
Remote
Station No. Starting
Address
Ending
Address
Branch Start
Instruction
(Required)
a) Memory Access Branch b) Local Station Processor
Data Table
010 020 023
G G G
Words
020
023
Area
Accessible to
Protected Commands
From Remote
Station No. 010
Branch End
Instruction
(Required)
Figure 5.4 shows a memory access rung with multiple branches. This
rung lists the remote station that may control specific data table words
with protected commands, as follows:
Station no. 020 can control words 070-076
Station no. 017 can control words 063-065 and word 022
Station no. 010 can control words 060-062
As shown in Figure 5.4, a single remote station processor may be
identified in more than one memory access rung branch.
Figure 5.4
Memory Access Rung (typical)
020
[ G ]
070
[ G ]
076
[ G ]
017
[ G ]
022
[ G ]
022
[ G ] (
02707
)
017
[ G ]
063
[ G ]
065
[ G ]
010
[ G ]
060
[ G ]
062
[ G ]
Use Branch End
Instructions
as Needed
One Branch End
Instruction Must
Precede Output
Instruction
Branch
Start
Instructions
Begin
Each
Branch
000 000 000 000 000 000
000 000 000 000 000 000