Allen-Bradley micrologix 1500 Reference Manual

Publication 1762-RM001C-EN-P
Compare Instructions 9-7
Addressing Modes and File Types can be used as shown in the following
table:
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.
Table 9.9 MEQ Instruction Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page4-2.
Parameter
Data Files
Function Files
(1)
(1) DAT files are valid for the MicroLogix 1500 only. PTO and PWM files are only recommended for use with MicroLogix
1200 and 1500 BXB units.
CS - Comms IOS - I/O DLS - Data Log
(2)
(2) The Data Log Status file can only be used by the MicroLogix 1500 1764-LRP Processor.
Address
Mode
(3)
(3) See Important note about indirect addressing.
Address
Level
O I S B T, C, R N ST L MG, PD RTC HSC PTO, PWM STI EII BHI MMI DAT TPI Immediate Direct Indirect Bit Word Long Word Element
Source •••••• •••••••••••••• • •••
Mask •••••• ••••••••••••••
• • •••
Compare •••••• ••••••••••••••
• • •••
IMPORTANT
You cannot use indirect addressing with: S, ST, MG, PD,
RTC, HSC, PTO, PWM, STI, EII, BHI, MMI, DAT, TPI, CS,
IOS, and DLS files.
LIM
Limit Test
Low Lim N7:0
0<
Test 0
0<
High Lim N7:1
0<
LIM
Table 9.10 Execution Time for the LIM Instructions
Controller Data Size When Rung Is:
True False
MicroLogix 1200 word 6.4
µ
s6.1
µ
s
long word 14.4
µ
s 13.6
µ
s
MicroLogix 1500 word 5.5
µ
s5.3
µ
s
long word 12.2
µ
s 11.7
µ
s
Table 9.11 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

Allen-Bradley micrologix 1500 Specifications

General

Brand	Allen-Bradley
Model	micrologix 1500
Category	Controller
Language	English