Chapter 4
Data File Organization and Addressing
4–2
Data File Types
For the purposes of addressing, each data 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 9 to 255. This applies to Bit, Timer,
Counter, Control, and Integer files only. Refer to the tables below:
Output
Input
Status
Bit
Timer
Counter
Control
Integer
O
I
S
B
T
C
R
N
0
1
2
3
4
5
6
7
File
Type
File
Number
Identifier
Bit
Timer
Counter
Control
Integer
B
T
C
R
N
9-255
File
Type
File
Number
Identifier
User-Defined Files
Data file types, identifiers, and numbers
Data files contain elements. As shown below, some data files have 1-word
elements, some have 3-word elements. You will be addressing elements,
words, and bits.
Output and Input files have 1word elements, with each element specified
by slot and word number:
Elements in Timer, Counter, and Control files consist of 3 words:
Status, Bit, and Integer files have 1word elements:
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
O:1.0
O:1.1
O:1.2
Element
0
1
2
Word
Addresses are made up of alpha-numeric characters separated by delimiters.
Delimiters include the colon, slash, and period.
Addressing Data Files
