PLC-PLC Communication Lecture Notes

Introduction

• Topic: PLC-PLC Communication
• Focus on I/O communication with I/O devices and I/O controllers
• Various methods exist with different advantages and disadvantages

Supported Siemens PLCs

• Compatible with S7 family: 1500, 300, 1200, and 400 series
• Older PLCs may not be compatible due to firmware restrictions
• Necessary firmware versions will be provided in the comments

Hardware Setup

• Two PLCs used for demonstration
• One PLC has:
  • CPU
  • Input module (with a push button)
  • Output module
• Other PLC is only a CPU without I/O modules

Communication Overview

• Objective: Transfer signal from push button on the first PLC to the second PLC
• Using PROFINET for communication helps avoid excessive wiring
• The first PLC (I/O Controller) will send the signal, while the second PLC (I/O Device) will receive it

Network Configuration

• Both PLCs need to be in the same network
• Confirmed through their Ethernet addresses

Configuring I/O Devices

• No configuration needed for the receiving PLC (I/O Device)
• Configuration is required on the sending PLC (I/O Controller)
• Set the operating mode to I/O Device on the appropriate Ethernet port of the sending PLC
• I/O Device sends only input and output statuses, not memory or database contents

Parameter Assignment

• Assign inputs and outputs for communication
• Select which signals to send from I/O Controller to I/O Device
• Example: Sending the push button status from I/O Controller to I/O Device

Downloading the Configuration

• Download the configuration to both PLCs
• Verify communication and status transfer
• Start processes in the correct order to establish connections

Results

• Upon pressing the push button on the first PLC, the second PLC receives the signal as input 1.0
• This allows the second PLC to utilize the status of the push button from the first PLC

Conclusion

• I/O communication is a key topic for PLC integration
• Works for many PLCs under the right conditions
• Encourages questions and engagement from viewers
• Reminder to like and subscribe for more content

Additional Notes

• Viewers encouraged to leave comments with questions or remarks.