Choosing the right PROFIBUS cable

27 August 2014

When it comes to selecting the optimal Profibus cable, several key considerations can significantly impact the performance and reliability of industrial networks. Understanding the specific requirements of your application is paramount, including factors such as cable length, environment, and data transmission speed.

Additionally, ensuring compatibility with Profibus standards and selecting cables with adequate shielding and impedance characteristics can mitigate potential signal interference and transmission errors. By adhering to these essential tips, engineers and technicians can make informed decisions to optimize the efficiency and robustness of their Profibus communication systems.

Is the application PROFIBUS DP or PROFIBUS PA?

  • DP cable has a 150 Ω impedance.
  • PA cable has a 100 Ω impedance.

My cable is purple, can I use it?

RS485, CAN bus, DeviceNet and other data cables can be purple but have a 120 Ω impedance.

What if my cable impedance is wrong?

PROFIBUS devices and their terminations are designed to match specific impedance. Your data signal will degrade and your waveforms will be malformed.

Use a test tool like PROFIBUS Troubleshooting Toolkit from PROCENTEC with a built-in scope function to check your signals.

The T1 Pepper Active Terminator matches can sort out any impedance mismatches.

Categories: Articles, PROFIBUS
<a href="" target="_self">Michael Garnham</a>

Michael Garnham


Michael has nearly two decades of experience spanning the information technology, energy, engineering, and automation sectors. Throughout his career, he has demonstrated proficiency in leveraging cutting-edge technologies to drive innovation and optimise processes.

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