Data Table
Chapter 3
33
Figure 3.2
PLC2/30
Memory Organization (Expanded Data T
able)
User
Program Storage
(User Program Begins
After End of Last
Data T
able Expansion)
Processor W
ork Area
No. 1
Processor W
ork Area
No. 2
Expansion
1
Expansion
2
Expansion
3
(etc.)
T
imer/Counter ACC V
alues or
Internal Storage
T
imer/Counter Preset V
alues or
Internal Storage
Message Storage
3
End of Program
Rack 1010017
Rack 2020027
1
Rack 3030037
Rack 4040047
Rack 7070077
Rack 6060067
Rack 5050057
Rack 11
10117
Rack 2120127
2
Rack 3130137
Rack 4140147
Rack 7170177
Rack 6160167
Rack 5150157
1
027 - Bits in this word are used by the
processor for battery low condition, message
generation, and data highway
. Do not put
output modules in rack 2, I/O group 7.
2
125 and 126 - These words are used to
indicate remote rack fault
status
in a remote
I/O system. Do not put input modules in rack
2, I/O groups 5 or 6.
3
Report generation messages can be stored in
memory locations not used by data table or
user program.
4
Maximum data table size is 8192 words.
Output Image Table
Rack address areas that are
not configured as output image
table become available for
timer/counter accumulated
values or word/bit storage.
Input Image Table
Rack address areas that are
not configured as input image
table become available for
timer/counter preset values or
word/bit storage.
Data table can be expanded in
128 word increments (unused
sections are utilized for user
program storage) up to 8064
words maximum.
Octal
W
ord Address
Decimal
Words
Per Area
Total
Decimal
Words
8
64
72
128
256
384
512
Up to
16,256
8
56
8
56
128
128
128
128640
4
007
010
77
100
107
110
177
200
277
300
377
400
577
600
777
1000
1177
1200
17777
000
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