plc ladder logic examples

Productivity Numbering Systems and Tag Database

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We will now look at the tag numbering systems used with the Productivity controller. The Productivity Suite Software allows us to use tags in the PLC. Tags are a method for assigning and referencing memory locations (numbering systems) within the programmable logic controller. They allow a more structured programming approach and are stored within a … Read more

Productivity Monitoring and Testing the Program

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We will now look at monitoring and testing our productivity program. The Productivity Suite Software provides tools for us to monitor and test our programs. Last time we used Tag Names and Details, Task Names and Descriptions, Rung Comments, and Instruction comments to document our first program and transferred this to our connected Productivity 1000 … Read more

Productivity 1000 PLC Establishing Communication

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We will be connecting the Productivity 1000 Series PLC with our computer running the Productivity Suite Software. A micro USB and an Ethernet (RJ45) communication link will be made to our programmable logic controller. The latest Productivity Suite software version is 3.1.0.11. This is the programming software that we will be using to create our … Read more

PLC Fiddle – Online Editor and Simulator

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PLC Fiddle – Online Editor and Simulator

I have recently come across a free virtual plc simulator called PLC Fiddle. It will enable you to create simple PLC ladder logic code within your browser free. This is an ideal way in understanding PLC concepts for industrial automation. All of the basic PLC instructions that come with most plc units have been incorporated … Read more

How to Troubleshoot a PLC – Ladder Logic

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We will look at how to troubleshoot a plc racing condition. Two examples are explained in racing conditions in the PLC. The PLC will update only at the end of the program logic. Items set will not happen until the I/O is refreshed. How to trigger events when you want them is discussed. Your control … Read more

The Secret of Using Timers – PLC Programming

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We will now look at the secret of using timers in the PLC. Timers are used in the majority of PLC programs. There are also a wide variety of off-the-shelf industrial timers that you can use. The implementation of timers can be vast; however, it all starts with a TIMING CHART. Timing Chart – Secret … Read more