Publication 1766-RM001A-EN-P - October 2008
194 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.
Mask •••••• ••• •••••••••••• • •••
Compare •••••• ••• •••••••••••
• • •••
(1) PTOX and PWMX files are only for use with MicroLogix 1400 BXB or BXBA unit.
(2) See Important note about indirect addressing.
MEQ Instruction Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 92.
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
PTOX, PWMX
STI
EII
BHI
MMI
LCD
Immediate
Direct
Indirect
Bit
Word
Long Word
Element
IMPORTANT
You cannot use indirect addressing with: S, MG, PD, RTC, HSC, PTOX,
PWMX, STI, EII, BHI, MMI, CS, IOS, and DLS files.
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 1400 word 7.0970 µs 0.2086 µs
long word 7.3803 µs 0.2009 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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