Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
212 Logical Instructions
Addressing Modes and File Types can be used as shown in the following
table:
Updates to Math Status
Bits
After a logical instruction is executed, the arithmetic status bits in the
status file are updated. The arithmetic status bits are in word 0 bits 0-3 in
the processor status file (S2).
Logical Instructions Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 82.
Parameter
Data Files
Function Files
(1)
CS - Comms IOS - I/O DLS- Data Log
Address
Mode
(2)
Address Level
O I S B T, C, R N F ST L MG, PD RI/RIX PLS RTC HSC PTO, PWM STI EII BHI MMI LCD Immediate Direct Indirect Bit Word Long Word Element
Source A •••••• ••• •••••••••••• • •••
Source B
(3)
•••••• ••• •••••••••••• • •••
Destination •••••• ••• • ••• •
• •••
(1) PTO and PWM files are valid for MicroLogix 1100 BBB unit.
(2) See Important note about indirect addressing.
(3) Source B does not apply to the NOT instruction. The NOT instruction only has one source value.
IMPORTANT
You cannot use indirect addressing with: S, ST, MG, PD,
RTC, HSC, PTO, PWM, STI, EII, BHI, MMI, CS, IOS, and
DLS files.
Math Status Bits
With this Bit: The Controller:
S:0/0 Carry always resets
S:0/1 Overflow always resets
S:0/2 Zero Bit sets if result is zero, otherwise resets
S:0/3 Sign Bit sets if result is negative (MSB is set), otherwise resets
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Allen-Bradley MicroLogix 1100 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1100
Category	Controller
Language	English