Rockwell Automation 1747-DTAM-E,D17476.1 Data Table Access Module (DTAM) - Manual (Page 97)

Publication 1747-6.1
Appendix
B
SLC 500 Data Files and Logical
Addressing
This appendix provides you with an overview of SLC 500 family data
files and logical addressing. It describes:
• data files
• data file types
• data file addressing
Data Files
Data files contain the status information associated with external I/O
and all other instructions you use in your program. In addition, these
files store information concerning processor operation.
Data File Types
For the purposes of addressing, each file type is identified by a letter
(identifier) and a file number.
File numbers 0 through 7 are the default files, created for you. If you
need additional storage, you can create files by specifying the
appropriate identifier and a file number from 10 to 255. This applies
to Bit, Timer, Counter, Control, and Integer files only. Refer to the
tables on the following page.
Output Image File Type
Output
Input
Status
Bit
Timer
Counter
Control
Integer
Identifier
O
I
S
B
T
C
R
N
File Number
0
1
2
3
4
5
6
7 Input Image
Status
Bit
Timer
Counter
Control
Integer
Reserved
Reserved
0
1
2
3
4
5
6
7
8
9
10-255
Bit, Timer, Counter,
Control, or Integer,
assigned as needed
Data Files
User-Defined Files
File Type
Bit
Timer
Counter
Control
Integer
Identifier
B
T
C
R
N
File Number
10-255
Not accessible from the DTAM
a
a