Allen-Bradley MicroLogix 1200 Reference Manual

Publication 1762-RM001C-EN-P
7-4 Relay-Type (Bit) Instructions
Addressing Modes and File Types can be used as shown in the following
table:
OTL - Output Latch
OTU - Output Unlatch
Instruction Type: output
The OTL and OTU instructions are retentive output instructions. OTL
turns on a bit, while OTU turns off a bit. These instructions are usually
used in pairs, with both instructions addressing the same bit.
Since these are latching outputs, once set (or reset), they remain set (or
reset) regardless of the rung condition.
Table 7.5 OTE 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
Destination Bit •••••• ••••••• • • • ••
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.
L
B3:0
1
L
B3:0
1
Table 7.6 Execution Time for the OTL and OTU Instructions
Controller OTL - When Rung Is: OTU - When Rung Is:
True False True False
MicroLogix 1200 1.0
µ
s0.0
µ
s1.1
µ
s0.0
µ
s
MicroLogix 1500 0.9
µ
s0.0
µ
s0.9
µ
s0.0
µ
s
ATTENTION
!
If you enable interrupts during the program scan via an
OTL, OTE, or UIE, this instruction must be the last
instruction executed on the rung (last instruction on last
branch). It is recommended this be the only output
instruction on the rung.
ATTENTION
!
In the event of a power loss, any OTL controlled bit
(including field devices) energizes with the return of
power if the OTL bit was set when power was lost.

Allen-Bradley MicroLogix 1200 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1200
Category	Control Unit
Language	English