Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
Number Systems 583
Hex Mask
This is a 4-character code, entered as a parameter in SQO, SQC, and other
instructions to exclude selected bits of a word from being operated on by
the instruction. The hexadecimal values are used in their binary
equivalent form, as indicated in the figure below. The figure also shows
an example of a hexadecimal code and the corresponding mask word.
Bits of the mask word that are set (1) will pass data from a source to a
destination. Reset bits (0) will not. In the example below, data in bits 0-7
of the source word is passed to the destination word. Data in bits 8-15 of
the source word is not passed to the destination word.
Source Word 1 1 1 0 1 0 0 1 1 1 0 0 1 0 1 0
Mask Word 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
Destination Word 0 0 0 0 0 0 0 0 1 1 0 0 1 0 1 0
(all bits 0 initially)
Hex Code
0 0 F F
0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
Mask Word
Hex
Value
Binary
Value
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
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Allen-Bradley MicroLogix 1100 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1100
Category	Controller
Language	English