Rockwell Automation 1747-PT1, D1747NP002 Hand-Held Terminal - Manual (Page 228)

Chapter 16
Bit Instructions
16–4
( )
Output Energize OTE Output Instruction
F1 F2 F3 F4 F5
ZOOM on OTE –( )– 2.3.0.0.2
NAME: OUTPUT ENERGIZE
BIT ADDR: O0:2.0/7 ********0*******
EDT_DAT
HHT Ladder Display:
HHT Zoom Display:
Ladder Diagrams and APS Displays: ( )
O:2.0
7
(online monitor mode)
Specific operation of an OTE instruction having an input data file
address: The status of an output terminal is reflected in the output data file
at a particular bit address. When the processor finds a true logic path in the
rung containing the OTE instruction, it sets this bit (1); this turns the output
terminal On and energizes the output device wired to the terminal during an
I/O scan. When a true logic path no longer exists, the processor resets the bit
(0), turning the terminal Off and de-energizing the output device during an
I/O scan.
The OTE instruction is non-retentive. OTE instructions are reset when:
•
You enter or return to the Run or Test mode or power is restored.
•
A CPU fault occurs.
•
The OTE is programmed within an inactive or false MCR zone.
Important: A bit that is set within a subroutine using an OTE instruction
remains set until the subroutine is scanned again.
Avoid duplicate OTE addresses within the same program file: When you
want two or more different conditions or sets of conditions to control an
output, avoid programming two or more OTE instructions with the same
address. This can cause unwanted results. Use input branching and a single
OTE instruction instead, as shown in the example below.
Output B3/3 is energized when
B3/1, or B3/2, or both are true.
] [
B3
1
] [
B3
2
( )
B3
3
] [
B3
2
( )
B3
3
( )
B3
3
] [
B3
1
If B3/1 is true and B3/2 is false, the OTE instruction will not
be energized. This is because the processor controls the
OTE based on the status of the last rung it solved that
contains the OTE address.
AVOID Duplicate OTE Addresses Use Input Branching and a
Single OTE Instead
Output Energize (OTE)