Rockwell Automation 1785 PLC-5 User Manual Page 37

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Addressing
Data Table Files 2-1
Addressing Data Table Files
(Enhanced, Ethernet, and ControlNet Processors) Series E and Later –
File Type
File-Type
Identifier
File
Number
Maximum Size of File
16-bit words and structures
c
Memory Used in
Overhead for each
File
(in 16-bit words)
Memory Used
(in 16-bit words) per
Word, Character, or
Structure
PLC-5/11, -5/20 PLC-5/30 PLC-5/40 PLC-5/60, -5/80
Output image O 0 32 64 128 192 6 1/word
Input image I 1 32 64 128 192 6 1/word
Status S 2 128 128 128 128 6 1/word
Bit (binary) B
3
a
2000 words 6 1/word
Timer T
4
a
6000 words/2000 structures 6 3/structure
Counter C
5
a
6000 words/2000 structures 6 3/structure
Control R
6
a
6000 words/2000 structures 6 3/structure
Integer N
7
a
2000 words 6 1/word
Floating-point F
8
a
4000 words/2000 structures 6 2/structure
ASCII A 3-999 2000 words 6 1/2 per character
BCD D 3-999 2000words 6 1/word
Block-transfer BT 3-999 12000 words/2000 structures 6 6/structure
CIO CT 3-999 12000 words/2000 structures 6 6/structure
Message MG 3-999
32760 words/585 structures
b
6 56/structure
PID PD 3-999
32718 words/399 structures
b
6 82/structure
SFC status SC 3-999 6000 words/2000 structures 6 3/structure
ASCII string ST 3-999
32760 words/780 structures
b
6 42/structure
Unused -- 9-999 6 6 0
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