What is the PROFIBUS failsafe mode?

Field Network Q&A

What is a failsafe mode in a PROFIBUS network? I've heard of it but have no idea what it means.

Expert’s answer: What is the PROFIBUS failsafe mode?

A simple mnemonic for you: The failsafe will keep your plant safe! Let me explain exactly what the PROFIBUS failsafe mode is because this is an important topic.

Should a bus or system fail in your plant, the failsafe mode will do its level best to set the process into a safe condition. So instead of things blowing up, everything should stop when a failsafe activates.

And when does it activate? Well, that depends on your setup. If you use analog communication, it will starts on 4 mA. In a failure, the signal will usually drop below that point. The same concept applies to digital communication; when signals drop to zero voltage, then you have a fail situation, and your failsafe should kick in to protect your equipment and employees.

These companies can help you with PROFIBUS projects and services:

Other resources that might interest you

PROFINET Flow meter
We need a field device with PROFINET built-in. Can we use a PROFINET connection? 

What’s the difference between PROFIBUS and PROFINET?
What’s the difference between a PROFIBUS and a PROFINET network?

Related tags: ABB digital communication Endress+Hauser fail safe failsafe mode MTL Pepperl+Fuchs Profibus Profibus DP Profibus PA safe condition
What is the PROFIBUS failsafe mode?
Resistors, intrinsic safety barriers, and galvanic isolators
Five Handhelds That Will Save a Lot of Time!
Can I measure bi-directional flow using vortex flow meters?
Converting 4-20 mA to 1-5 volts
See related devices