Rockwell Automation 1747-DTAM-E,D17476.1 Data Table Access Module (DTAM) - Manual (Page 101)

SLC 500 Data Files and Logical Addressing B-5
Publication 1747-6.1
Data File 3 - Bit
File 3 is the bit file, used principally for relay logic instructions, shift
registers, and sequencers. The maximum size of the file is 256
1-word elements, or a total of 4096 bits. You can address bits by
specifying the element number (0-255) and the bit number within the
element (0-15). You can also address bits simply by numbering them
in sequence, from 0 to 4095.
You can also address elements of this file.
Format Explanation Examples
Bf:e/b
B Bit type file B3:3/14
Bit 14, element 03
B3:252/0
Bit 0, element 252
B3:9
Bit 0-15, element 9
f File number.
Number 3 is the default file. A file
number between 10-255 can be used if
additional storage is required.
: Element delimiter
e
Element
number Ranges from 0 to 255. These are 1-word
elements. 16-bits per element.
/ Bit delimiter.
b Bit number
Bit location within the element. Ranges
from 1 to 15.
Bf/b B
f
/ Same as above.
B3/62
Bit 62
B3/4032
Bit 4032
b Bit number
This is the numerical position of the bit
within the file. Ranges from 0 to 4095.
15 14 13 12 11 10 9 8 7 6 5 4
0
0
1
2
3
252
253
254
255
Element 3 2 1
Bit 14, element 3.
Address B3:3/14
Can also be
expressed as bit 62.
Address B3/62
Bit 0, element 252.
Address B3:252/0
Can also be
expressed as bit
4032.
Address B3/4032