Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
184 Compare Instructions
LIM - Limit Test
Instruction Type: input
The LIM instruction is used to test for values within or outside of a
specified range. The LIM instruction is evaluated based on the Low Limit,
Test, and High Limit values as shown in the following table.
The Low Limit, Test, and High Limit values can be word addresses or
constants, restricted to the following combinations:
• If the Test parameter is a constant, both the Low Limit and High
Limit parameters must be word or long word addresses.
• If the Test parameter is a word or long word address, the Low Limit
and High Limit parameters can be either a constant, a word, or a
long word address. But the Low Limit and High Limit parameters
cannot both be constants.
When mixed-sized parameters are used, all parameters are put into the
format of the largest parameter. For instance, if a word and a long word
are used, the word is converted to a long word.
The data ranges are:
• -32,768 to 32,767 (word)
• -2,147,483,648 to 2,147,483,647 (long word)
Addressing Modes and File Types can be used as shown in the following
table:
LIM
Limit Test
Low Lim N7:0
0<
Test 0
0<
High Lim N7:1
0<
LIM
Execution Time for the LIM Instructions
Controller Data Size When Rung Is:
True False
MicroLogix 1100 word 38.96 μs 0.87 μs
long word 38.96 μs 0.87 μs
LIM Instruction Operation Based on Low Limit, Test, and High Limit Values
When: And: Rung State
Low Limit ≤ High Limit Low Limit ≤ Test ≤ High Limit true
Low Limit ≤ High Limit Test < Low Limit or Test > High Limit false
High Limit < Low Limit High Limit < Test < Low Limit false
High Limit < Low Limit Test ≥ High Limit or Test ≤ Low Limit true
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Allen-Bradley MicroLogix 1100 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1100
Category	Controller
Language	English