Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
88 Programming Instructions Overview
Indirect Addressing Example
An equivalent example using indirect addressing is shown below. In place
of using the index register, S:24, the user can designate any other valid
word address as the indirect address. Multiple indirect addresses can be
used within an instruction.
The following ADD instruction uses an indirect address in the Source A
and Destination addresses. If the indirect offset value is 20 (stored in
N7:3), the controller uses the data stored at the base address plus the
indirect offset to perform to instruction.
In this example, the controller uses the following addresses:
Operand Base Address Offset Value in N7:3 Working Address
Source A N7:0 20 N7:20
Destination N7:0 20 N15:20
Indirect Working
ADD
Add
Source A N7:[N7:3]
Source B 25
Dest N15:[N7:3]
ADD ADD
Add
Source A N7:20
Source B 25
Dest N15:20
ADD
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Allen-Bradley MicroLogix 1100 Specifications

General

Processor	32-bit
Programming Software	RSLogix 500
Mounting	DIN rail or panel mount
Power Supply	24V DC
Type	Compact PLC
Digital Inputs	12
Digital Outputs	8
Analog Inputs	4 (depending on model)
Analog Outputs	Optional with expansion module
Programming Language	Ladder Logic
Operating Temperature	0 to 55 °C (32 to 131 °F)
Series	MicroLogix