In this PLC programming tutorial, we will explore how to write a program for a machine using an “S7 300” PLC and “STEP 7” software. This tutorial will guide you step by step in creating a program to control a tank filling process. Let’s dive in!
Introduction
Imagine a tank with two pumps transferring separate liquids into it. Inside the tank, there are two level switches, one in the lower part and the other in the upper part. These switches provide a digital signal indicating whether the liquid level is low or high. Additionally, there is an electrically powered mixer inside the tank.
The goal is to write a program that automates the tank filling process. The program should activate the pumps when the liquid level is low until it reaches the maximum level. Once the tank is full, the program should turn off the pumps, activate the mixer for a specified time, and finally open the discharge valve to transfer the liquid to another location within the factory.
Configuring the Hardware
To begin, we need to configure the hardware components in “STEP 7.” The “S7 300” PLC requires various modules, such as a power supply, CPU, digital input module, and digital output module.
- Create a new project in “SIMATIC Manager” and name it “Mixer.”
- Add the relevant modules, starting with the power supply in the first slot of the rack.
- Insert the “CPU 316” module in the second slot.
- Add the digital input module in slots 4-11 and the digital output module in slots 12-19.
Writing the Program
- Open the “OB 1” block in the “S7 Program” folder.
- Start writing the program using simple and practical instructions to control the machine.
FAQs
Q: Can I use a different PLC model for this tutorial?
A: This tutorial specifically focuses on using the “S7 300” PLC. However, the concepts and principles can be adapted to other PLC models as well.
Q: What is the purpose of the level switches?
A: The level switches provide digital signals that indicate the current liquid level in the tank. These signals are used to activate and deactivate various components of the tank filling process.
Q: Can I modify the program to suit my specific requirements?
A: Absolutely! This tutorial serves as a foundation for understanding PLC programming. You can modify the program according to your specific needs and the requirements of your machine.
Conclusion
In this tutorial, we explored how to write a PLC program using an “S7 300” PLC and “STEP 7” software. By following the steps outlined in this tutorial, you can create a program to control a tank filling process. Remember to adapt the program to suit your specific requirements.
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