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Publication 1763-RM001C-EN-P - October 2009
162
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.
OTE Instruction Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 82.
Parameter
Data Files
Function Files
(1)
CS - Com
m
s
IOS - I/O
DLS
-
D
a
ta
L
o
g
Address
Mode
(2)
Address Level
O
I
S
B
T,
C
, R
N
F
ST
L
MG, PD
RI/RIX
PLS
RTC
HSC
PTO, PW
M
STI
EII
BH
I
MMI
LCD
Immedia
te
Dir
e
c
t
Indir
e
ct
Bit
Wo
rd
Long W
o
rd
Ele
m
ent
Destination Bit
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
(1) PTO and PWM files are only for use with MicroLogix 1100 BBB unit.
(2) See Important note about indirect addressing.
IMPORTANT
You cannot use indirect addressing with: S, ST, MG, PD,
RTC, HSC, PTO, PWM, STI, EII, BHI, MMI, LCD, CS, IOS,
and DLS files.
L
B3:0
1
U
B3:0
1
Execution Time for the OTL and OTU Instructions
Controller
OTL - When Rung Is:
OTU - When Rung Is:
True
False
True
False
MicroLogix 1100
1.46
μ
s
1.43
μ
s
1.46
μ
s
1.43
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.
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