Allen-Bradley SLC 500 Series User Manual

Publication 1747-RM001G-EN-P - November 2008
2-4 Basic Instructions
Output Energize (OTE)
Use the OTE instruction in your ladder program to turn on a bit when rung
conditions are evaluated as true.
An example of a device that turns on or off is an output wired to a pilot light
(addressed as O:0/4).
OTE instructions are reset when:
• the SLC enters or returns to the REM Run or REM Test mode or
power is restored.
• the OTE is programmed within an inactive or false Master Control
Reset (MCR) zone.
Output Latch (OTL) and
Output Unlatch (OTU)
OTL and OTU are retentive output instructions. OTL can only turn on a bit,
while OTU can only turn off a bit. These instructions are usually used in pairs,
with both instructions addressing the same bit.
Your program can examine a bit controlled by OTL and OTU instructions as
often as necessary.
Using OTL
When you assign an address to the OTL instruction that corresponds to the
address of a physical output, the output device wired to this screw terminal is
energized when the bit is set (turned on or enabled).
When rung conditions become false (after being true), the bit remains set and
the corresponding output device remains energized.
( )
Output Instruction
Fixed SLC
5/01
SLC
5/02
SLC
5/03
SLC
5/04
SLC
5/05
• •••••
TIP
A bit that is set within a subroutine using an OTE
instruction remains set until the subroutine is
scanned again.
(L)
(U)
Output Instructions
Fixed SLC
5/01
SLC
5/02
SLC
5/03
SLC
5/04
SLC
5/05
• •••••
ATTENTION
Under fatal error conditions, physical outputs are
turned off. Once the error conditions are cleared, the
controller resumes operation using the data table
value of the operand.

Allen-Bradley SLC 500 Series Specifications

General

Brand	Allen-Bradley
Model	SLC 500 Series
Category	Controller
Language	English