Publication 1766-RM001A-EN-P - October 2008
Controller Memory and File Types
45
Data Files
Data files store numeric information, including I/O, status, and other data
associated with the instructions used in ladder subroutines. The data file
types are:
File Name
File
Identifier
File
Number
(1)
Words per
Element
File Description
Output File
O
0
1
The Output File stores the values that are written to the physical outputs
during the Output Scan.
Input File
I
1
1
The Input File stores the values that are read from the physical inputs
during the Input Scan.
Status File
S
2
1
The contents of the Status File are determined by the functions which
utilize the Status File. See System Status File on page 551 for a detailed
description.
Bit File
B
3
, 9…255
1
The Bit File is a general purpose file typically used for bit logic.
Timer File
T
4
, 9…255
3
The Timer File is used for maintaining timing information for ladder logic
timing instructions. See Timer and Counter Instructions on page 175 for
instruction information.
Counter File
C
5
, 9…255
3
The Counter File is used for maintaining counting information for ladder
logic counting instructions. See Timer and Counter Instructions on page
175 for instruction information.
Control File
R
6
, 9…255
3
The Control Data file is used for maintaining length and position
information for various ladder logic instructions. See Control Data File on
page 366 for more information.
Integer File
N
7
, 9…255
1
The Integer File is a general purpose file consisting of 16-bit, signed
integer data words.
Floating Point
File
F
8
, 9…255
2
The Floating Point File is a general purpose file consisting of 32-bit
IEEE-754 floating point data elements. See Using the Floating Point (F)
Data File on page 201 for more information.
String File
ST
9…255
42
The String File is a file that stores ASCII characters. See String (ST) Data
File on page 364 for more information.
ASCII File
A
9…255
1
The ASCII File is a file that stores ASCII characters. See ASCII (A) Data File
on page xxx for more information.
Long Word File
L
9…255
2
The Long Word File is a general purpose file consisting of 32-bit, signed
integer data words.
Message File
MG
9…255
25
The Message File is associated with the MSG instruction. See
Communications Instructions on page 393 for information on the MSG
instruction.
Programmable
Limit Switch File
PLS
9…255
6
The Programmable Limit Switch (PLS) File allows you to configure the
High-Speed Counter to operate as a PLS or rotary cam switch. See
Programmable Limit Switch (PLS) File on page 132 for information.
PID File
PD
9…255
23
The PID File is associated with the PID instruction. See Process Control
Instruction on page 329 for more information.
Routing
Information File
RI
9…255
20
The Routing Information File is associated with the MSG instruction. See
Communications Instructions on page 393 for information on the MSG
instruction.
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