Rockwell Automation 1761 MicroLogix 1000 Programmable Controllers - Manual (Page 103)

Using Basic Instructions
6–5
Output Energize (OTE)
Use an 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 O0:0/4).
OTE instructions are reset when:
•
You enter or return 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.
Note A bit that is set within a subroutine using an OTE instruction remains set until the
subroutine is scanned again.
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.
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.
Programming
Execution Times
(
µ
sec) when:
True False
4.43 4.43
( )
False
4.97
Execution Times
(
µ
sec) when:
True
3.16 OTL
4.97 3.16 OTU
(L)
(U)