HomePLC Programing Cable S7-200 Siemens Connecting PC

[DIY-Cable] S7-200 Siemens Connecting PC

Building Your Own Siemens S7-200 PPI PLC Programming Cable


Siemens S7-200 PLC, often hailed as a legend in the world of programmable logic controllers (PLCs), has been a trusted companion for countless automation engineers. This robust and reliable device has played a pivotal role in countless industrial automation applications.

However, owning a Siemens S7-200 PLC comes with its challenges, particularly when it comes to programming cables. They aren’t always readily available, and their price can be steep. In this article, we’ll guide you through the process of creating your very own Siemens S7-200 PPI PLC programming cable, helping you save both time and money.

What You’ll Need

[DIY-Cable] S7-200 Siemens Connecting PC

To embark on this DIY journey, you’ll require a handful of readily available components:

  • COM DB9-Male Connector: This is one end of the cable that will connect to your computer’s serial port.
  • COM DB9-Female Connector: The other end of the cable, which connects to your Siemens S7-200 PLC.
  • Green LED: This LED will serve as an indicator during the communication process.
  • Resistors: You’ll need resistors with values of 3kΩ, 5kΩ, and 680Ω.

Let’s Get Started

Building your Siemens S7-200 PPI PLC programming cable may seem daunting, but it’s a relatively straightforward process. Follow these steps carefully:

  • Prepare the Connectors: Begin by soldering the DB9-Male connector to one end of your cable and the DB9-Female connector to the other end. Ensure that the connections are secure, as a loose connection can lead to communication issues.
  • Assemble the LED Indicator: Take the green LED and connect its anode (longer leg) to one end of the 680Ω resistor. Connect the other end of the resistor to pin 7 (RTS – Request to Send) on the DB9-Male connector. Connect the LED’s cathode (shorter leg) directly to pin 5 (GND – Ground) on the same DB9-Male connector. This LED will provide a visual indicator of communication.
  • Select the Right Resistor: Depending on your specific Siemens S7-200 PLC model and your computer’s serial port, you’ll need to experiment with different resistors. Generally, a 3kΩ resistor is suitable for most setups. However, if you encounter communication issues, try the 5kΩ or 680Ω resistors to achieve optimal results.
  • Testing: With your cable assembled, it’s time to test it. Connect the DB9-Male end to your computer’s serial port and the DB9-Female end to the Siemens S7-200 PLC. Power up the PLC and use your preferred programming software to establish communication. The green LED should light up, indicating successful communication.


Congratulations! You’ve successfully created your Siemens S7-200 PPI PLC programming cable. This DIY project not only saves you money but also ensures you have a reliable tool at your disposal whenever you need it. Siemens S7-200 PLCs have left an indelible mark in the world of automation, and with your homemade programming cable, you’re ready to harness their power for your industrial applications.

As you explore the world of PLC programming and automation, remember that troubleshooting and fine-tuning may be necessary, especially when dealing with different Siemens S7-200 models and computer configurations. Don’t be afraid to experiment with resistor values or seek advice from fellow engineers who have embarked on similar DIY projects.

We hope this guide has been helpful in your journey to create a Siemens S7-200 PPI PLC programming cable. With dedication and a bit of technical know-how, you’re well on your way to mastering the art of PLC programming and automation. Good luck, and may your PLC projects be a resounding success!

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