Chapter 4
Data File Organization and Addressing
4–3
Typical element, word, and bit addresses are shown below:
Type
N7:15
Element
Number
File
File
Delimiter
Element
Type
T4:7.ACC
Element
Number
File
File
Delimiter
Element
Word
Delimiter
Word
Type
B3:64/15
Element
Number
File
File
Delimiter
Element
Bit
Delimiter
Bit
An element address
A word address
A bit address
The address format varies, depending on the file type. This is explained in
the following sections, beginning with file 2, the status file, and following
with files 0, 1, 3, 4, 5, 6, and 7.
Data File 2 - Status
The status file is explained in chapter 27. You can address various bits and
words as follows:
Format
Explanation
S
Status file
:
Element delimiter
S:e/b
e
Element
number
Ranges from 0 to 15 in a SLC 5/01 or fixed controller, 032
in a SLC 5/02. These are 1word elements. 16 bits per
element.
/
Bit delimiter
b
Bit number
Bit location within the element. Ranges from 0 to 15.
Examples:
S:1/15
Element 1, bit 15. This is the first pass" bit, which you can use to
initialize instructions in your program.
S:3
Element 3. The lower byte of this element is the current scan time.
The upper byte is the watchdog scan time.
