Allen-Bradley MicroLogix 1400 User Manual

661 Publication 1766-RM001A-EN-P - October 2008
Appendix 26
Number Systems
This appendix:
• covers binary and hexadecimal numbers.
• explains the use of a hex mask to filter data in certain programming
instructions.
Binary Numbers
The processor memory stores 16-bit binary numbers. As indicated in the
following figure, each position in the number has a decimal value,
beginning at the right with 2
0
and ending at the left with 2
15.
Each position can be 0 or 1 in the processor memory. A 0 indicates a
value of 0; a 1 indicates the decimal value of the position. The equivalent
decimal value of the binary number is the sum of the position values.
Positive Decimal Values
The far left position will always be 0 for positive values. As indicated in
the figure, this limits the maximum positive decimal value to 32767. All
positions are 1 except the far left position.
Other examples:
0000 1001 0000 1110
= 2
11
+2
8
+2
3
+2
2
+2
1
= 2048+256+8+4+2 = 2318
0010 0011 0010 1000
= 2
13
+2
9
+2
8
+2
5
+2
3
= 8192+512+256+32+8
= 9000
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Allen-Bradley MicroLogix 1400 Specifications

General

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes