Practical Tips and Techniques
PLC programs scan cyclically. This means that it is repeated many times and in the same order. The primary sequence of a PLC scan is reading the inputs, executing the program, diagnostics, and communication, and updating the outputs. We will look at these scan items with particular attention to how the ladder logic program is … Read more
This tutorial is for beginners who are just starting to program PLCs. Using the EasyPLC simple conveyor, we will move a box back and forth on the conveyor. We will learn to write the PLC ladder logic program for this operation. Using the five steps to PLC programming development, we will determine what must be … Read more
Previously we looked at the easy PLC machine editor design simulation. We created a mixing tank simulation using the EasyPLC machine editor. The tank included a control panel and operation indication. We will now use the Do-More designer programming software to program the ladder logic for this EasyPLC mixing tank application. The built-in simulator of … Read more
You’ve had this idea for years since you were a kid. You want to be an electrical engineer, and you’re finally going to follow through on it and learn PLC programming to start your career off right! What? That’s what you thought, anyway. But then you started googling around, trying to figure out how to … Read more
The Click PLC has automatic linear scaling for the analog inputs and outputs. What if the analog input or output is not linear? How do you handle this in the PLC? Look at the following tank. We can measure the height, which is linear, but the volume will not because of the shape of the … Read more
Logic circuits in a PLC ladder logic program are either on or off. The inputs change, which will affect the outputs. This can be expressed in a timing diagram. The timing diagram or chart will show you how the ladder logic program will respond to the changing states of the inputs and outputs. This visual … Read more
