Inst ToolsInst ToolsInst Tools
  • Ask
  • Courses
  • Videos
  • Q & A
    • Interview
      • Instrumentation
      • Electronics
      • Electrical
      • Practical Questions
    • MCQ
      • Instrumentation MCQ
      • Electrical MCQ
      • Electronics MCQ
      • Control Systems MCQ
      • Analog Electronics MCQ
      • Digital Electronics MCQ
      • Power Electronics MCQ
      • Microprocessor MCQ
      • Multiple Choice Questions
  • EE
    • Electronics
      • Electronics Q & A
      • Electronic Basics
      • Electronic Devices & Circuits
      • Electronics Animation
      • Digital Electronics
    • Electrical
      • Electrical Basics
      • Electrical Q & A
      • Power Electronics
      • Electrical Machines
      • Electrical Animation
      • Power Systems
      • Switchgear & Protection
      • Transmission & Distribution
  • Measure
    • Control Valves
    • Calibration
    • Temperature
    • Pressure
    • Flow
    • Level
    • Analyzers
    • Switches
    • Vibration
    • Solenoid Valve
  • Control
    • PLC Tutorials
    • Control Systems
    • Safety Instrumented System (SIS)
    • Communication
    • Fire & Gas System
  • More
    • Design
    • Tools
    • Animation
    • Basics
    • Formulas
    • Standards
    • TextBooks
    • Common
    • Software
    • Excel Tools
    • Erection & Commissioning
    • Process Fundamentals
    • Videos
    • Books
Search
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Reading: PLC Program for Alternate Output Circuit with Latched Function
Share
Notification Show More
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • PLC Tutorials
  • Control Systems
Search
  • Ask
  • Courses
  • Videos
  • Q & A
    • Interview
    • MCQ
  • EE
    • Electronics
    • Electrical
  • Measure
    • Control Valves
    • Calibration
    • Temperature
    • Pressure
    • Flow
    • Level
    • Analyzers
    • Switches
    • Vibration
    • Solenoid Valve
  • Control
    • PLC Tutorials
    • Control Systems
    • Safety Instrumented System (SIS)
    • Communication
    • Fire & Gas System
  • More
    • Design
    • Tools
    • Animation
    • Basics
    • Formulas
    • Standards
    • TextBooks
    • Common
    • Software
    • Excel Tools
    • Erection & Commissioning
    • Process Fundamentals
    • Videos
    • Books
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Guest Articles > PLC Program for Alternate Output Circuit with Latched Function

PLC Program for Alternate Output Circuit with Latched Function

Design a PLC program for an alternate output circuit with a latched function and explain the ladder logic with a solution.

Last updated: November 3, 2023 11:38 am
Editorial Staff
Guest Articles PLC Tutorials
No Comments
Share
4 Min Read
SHARE

Design a PLC program for an alternate output circuit with a latched function and explain the ladder logic with a solution.

Contents
Alternate Output CircuitProblem DiagramProblem SolutionList of PLC Inputs & OutputsInputs ListOutput ListM MemoryLadder Diagram for alternate output circuit (with latched function)PLC Program DescriptionNetwork 1:Network 2:Network 3:Network 4:Network 5:Test Cases

Alternate Output Circuit

Problem Description

Setting the light ON by pressing a SWITCH on 1st time, 3rd time, 5th time etc. and setting the same light OFF by pressing the SWITCH by 2nd time , 4th time, 6th time etc.

Restore the output status to “0” when system or cycle power up. Output can be START by pressing a BUTTON in ODD number of times and can be STOP by pressing the same BUTTON by EVEN number of times.

Problem Diagram

PLC Program for an Alternate output circuit

Problem Solution

We can solve this problem by using simple Ladder logic. In this we consider one simple example of alternate LED operation.

Here we consider one LED and one BUTTON. Press the BUTTON alternately and output should be ON/OFF alternately, here during the Button pressed odd number times then output should be ON and during the button pressing even number of times then the output should be OFF.

List of PLC Inputs & Outputs

Inputs List

  • SWITCH : I0.0

Output List

  • LED : Q0.0

M Memory

  • M0.0 for LED reset condition
  • M0.1 for counter reset
  • M11.0 & M11.1 – Positive edge

Ladder Diagram for alternate output circuit (with latched function)

circuit with latched function
PLC latched function
PLC Circuit Latched
PLC Switch Output
PLC Alternate Output

PLC Program Description

In this application, we have used Siemens S7-300 PLC and TIA Portal Software for programming.

Network 1:

In network 1 we have used SET instruction to set the LED (Q0.0). Here we have taken NO contact of BUTTON (I0.0)

so LED (Q0.0) can be activated by pressing BUTTON (I0.0).

Network 2:

Here we used a counter so it will count the switching times of the BUTTON (I0.0).

This counter will tell us about the number of times the button is pressed, its value or the value is a EVEN number or ODD number.

Network 3:

When counter will reach its preset value (2) or say EVEN number of times, NO contact of the counter will set the M0.0 (LED reset condition).

Network 4:

In this network NO contact of the M0.0 will RESET the LED and counter.

Here M0.1 (counter reset memory) will RESET the counter.

Network 5:

If M0.0 is ON and negative transition (from 1 to 0) of button (I0.0) will be triggered then RESET condition of LED will be OFF.

Note : This example is provided to understand the basic concept of alternate output circuit, it is not full application but we can use this concept in any automation application or any system.

Test Cases

alternate output circuit

Author : Bhavesh

If you liked this article, then please subscribe to our YouTube Channel for PLC and SCADA video tutorials.

You can also follow us on Facebook and Twitter to receive daily updates.

Read Next:

  • Setpoints and Alarms
  • PLC Digital Signals Wiring
  • Free SCADA Software 
  • PLC Contacts and coils
  • Control Room Interview Questions
Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !
What is a Data Block? Global Data Blocks in PLC
Quiz Program Logic Using PLC Programming
Testing and Validation in PLC Development
What is Process Control?
Types of Interrupt OB in Siemens Tia Portal
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
208kSubscribersSubscribe
38kFollowersFollow

Categories

Recent Comments

  • Kamli on Top Free PLC Software
  • Guifty Shimica on Top Non-PLC Certification Courses for Automation Professionals
  • Guifty Shimica on Top Non-PLC Certification Courses for Automation Professionals
  • MIHARITSOA Aina Sitraka on Top Non-PLC Certification Courses for Automation Professionals

Related Articles

Questions on Single Loop Controller

Single Loop Controller Questions

Lights with Adjustable Timers PLC Programming

Flip-Flop PLC Programming: Lights with Adjustable Timers

Logic for Always ON and Always OFF bit

Always ON and OFF Bit using Ladder Logic and Statement List

LES and GRT Blocks in PLC Programming

Allen Bradley Math Functions

Capacitance-Level-Transmitter

Capacitance Level Switch Calibration

How to Detect Speed of Conveyor in PLC

How to Detect Speed of Conveyor in PLC?

memory types in siemens plc

#13 PLC Best Practices – Disable Unused Communication Ports

Organization block Siemens

Tia Portal – OB30 Cyclic Interrupt Organization Block

More Articles

Foundation Fieldbus Segment Topology

Foundation Fieldbus (FF) Segment Topology

Loss in Weight Liquid PLC System

Dosing Pump PLC Logic

Motor Cooling Methods

Motor Cooling Methods

Electrical Machines Questions and Answers

Speed Control of DC Motors Quiz

Demister Pads Problem

Problems with Demister Pads – Root Cause Analysis (RCA)

Phase Failure Relay

Why is Phase Failure Relay Required in LV Panels?

How to Calibrate pH Electrode?

How to Calibrate pH Electrode?

Quiz on Electrical Drawings and Symbols

264 Quiz on Electrical Drawings and Symbols

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?