Contents
Beginner

PLC Programming Fundamentals – OTE Instruction

By
Vladimir Romanov
|
July 17, 2018
Table of Contents

Introduction

The OTE, also known as Output Energize, instruction will energize a single bit of data if the input leading to it is true. It’s a fundamental instruction used in Programmable Logic Controllers (PLCs). This instruction will be found on the right side within a ladder logic structure and turn a bit to a HIGH state if the preceding instructions evaluate to true. If the same instructions evaluate to false, the OTE instruction will set the specified bit to a LOW state.

Example & Usage of OTE

Here’s a real-world scenario of an OTE instruction:

  1. A Micrologix 1100 Allen Bradley PLC is used to control a process.
  2. A motor contactor is connected to Output 0 (O:o/o of the PLC).
  3. A normally open push button (“System Start”) is connected to Input 0 (I:0/0 of the PLC).
  4. An operator presses the start button.
  5. The XIC instruction is tied to I:0/0.
  6. The OTE instruction is tied to O:0/o.
  7. The OTE instruction energizes the output (O:0/0) while the XIC is TRUE.
  8. The OTE instruction de-energizes the output (O:0/0) while the XIC is FALSE.

Programming example in RSLogix 500:

OTE Output Energize Instruction RSLogix 500

Outcome:
The OTE instruction will energize the output of the PLC which will allow the motor tied to the starter to run.

Data Types Allowed for OTE

The OTE instruction will work with the following data types within the RSLogix 500 environment:

  • Boolean – The OTE may only evaluate TRUE/FALSE or 1/0 or HIGH/LOW.

Important Notes

  • Note 1 – The OTE instruction was initially used to set the status of miscellaneous outputs landed on the PLC. However, it may be used on any boolean within the program. In other words, it can energize or de-energize any boolean within the program. Through this property, programmers can utilize the OTE instruction for a wide range of applications.

Video Tutorial

Got a question or comment?

Related Tutorials

Beginner

How to Build an Allen Bradley PLC Trainer Kit for PLC Training at Home

The best way to learn PLC programming is to get hands-on experience. However, as many are trying to learn how to program these devices before landing a job, it becomes crucial to invest in your own hardware in order to accelerate the learning process. That being said, a PLC programmer will face three challenges when it comes to building an effective PLC trainer.

April 10, 2020
|
By
Vladimir Romanov
Beginner

Photo Eye Sensor | How to Wire a Photoelectric Sensor into a CompactLogix Allen Bradley PLC

Learn how to work with photoelectric sensors, understand the basics, how to wire them, how to tie them into various PLCs and field devices and lastly how to troubleshoot them.

April 24, 2020
|
By
Vladimir Romanov
Beginner

PLC Programming | How to Read Ladder Logic

Learn the basics of Ladder Logic, one of the top 5 most popular types of PLC programming languages used in manufacturing environments.

April 7, 2020
|
By
Vladimir Romanov