Couplers counseling!

Field Network Q&A

We're designing a new PROFIBUS network and we have a couple of questions. What's the difference between couplers and links? And what benefits can we get from each?

Expert’s answer: Couplers counseling!

Welcome to couplers counseling! We want to make sure everyone leaves happy, preferably with those they came in with!

So you want to know more about couplers and links. Let’s go over both and see where we end up.

First up, couplers! Actually, in the instrumentation world, couplers act more like counselors. They send physical bus characteristics between PROFIBUS DP and PROFIBUS PA networks, mostly in simple. Furthermore, they do so transparently, bringing the networks together and slipping them the room key rather than directing the action.

Couplers counseling PROFIBUS
PROFIBUS – Courtesy of PROFIBUS International

You can use couplers in explosive and non-explosive places, which we in the industry call ex and non-ex. Keep in mind, though, that in the ex, you can only have so many devices in each segment. You definitely don’t want too many players in a volatile environment, right?

Now let’s talk about links. They see a little more action than couplers because they can switch, if you know what I mean. I mean that links act as slaves in PROFIBUS DP and masters in PROFIBUS PA. They also support larger networks than couplers. Each link has a physical address and allow up to five couplers to connect with them. So yeah, links perform on a field pick-up artists can only dream about!

These companies have everything your PROFIBUS needs for a good time:

Other resources that might interest you

PROFIBUS DP/PA remote configuration
Can you bypass your PLC with remote access if you have a PROFIBUS network.

FOUNDATION Fieldbus architecture
What architecture can you build in an FF system?

Related tags: Couplers Field Network Links PROFIBUS association Profibus DP Profibus PA project
Couplers counseling!
Everything you need to know about wireless communication
Everything you need to know about EtherNet/IP
Everything you need to know about IO-Link
Everything you need to know about AS-Interface
See related devices