If your industrial networking fieldbus setup has room for another gateway, you're likely choosing between two used cards at very different price points: the Delta Tau ACC-72E and the SEW-Eurodrive DFP21B. One is a CAN/PROFIBUS interface card; the other is a PROFIBUS DP-V1 gateway built for SEW drives. The right pick depends on what you're connecting and which fieldbus your network speaks.
Quick verdict
For a SEW-based drive system that needs PROFIBUS DP-V1, the SEW DFP21B is the more targeted buy. For a custom control panel that requires CAN/PROFIBUS support, the Delta Tau ACC-72E is the broader interface card.
At a glance
The price gap is significant, but it's not a shortcut to a recommendation. The two cards work in different network contexts, so the cheaper one can be the right one if your drives demand it.
| Product | Price | Fieldbus | Compatibility | Price bar |
|---|---|---|---|---|
| Delta Tau ACC-72E | $404.99 | CAN / PROFIBUS | General interface card | |
| SEW-Eurodrive DFP21B/UOH11B | $155.00 | PROFIBUS DP-V1 | MOVIDRIVE MDX61B / MOVITRAC B series |
Where each product wins
- Choose the Delta Tau ACC-72E if you need both CAN and PROFIBUS support in one interface card and your system isn't built around SEW inverters.
- Choose the SEW DFP21B if you have MOVIDRIVE or MOVITRAC B drives and want a PROFIBUS DP-V1 gateway that's designed for them.
Delta Tau ACC-72E Fieldbus Gateway CAN/PROFIBUS Interface Card
The Delta Tau ACC-72E is a used interface card that puts both CAN and PROFIBUS in its name, so it's the flexible choice when your control system needs to speak two protocols. As the higher-priced unit in this pairing, it's also the more neutral one: it's not tied to a specific drive family, which makes it a good match for a controller that already has its own logic and just needs a fieldbus bridge. Choose it when you need a general-purpose CAN/PROFIBUS card rather than a drive-specific gateway. The tradeoff is that it's a card, not a turnkey gateway system, and its used condition means you're receiving a standalone hardware piece. Its strengths are protocol coverage and neutrality, so the responsibility for matching it to your network falls on your existing setup.
SEW-Eurodrive DFP21B/UOH11B PROFIBUS DP-V1 Fieldbus Gateway MOVIDRIVE MOVITRAC
The SEW-Eurodrive DFP21B/UOH11B is a used PROFIBUS DP-V1 gateway with a clearly defined job: connect SEW MOVIDRIVE MDX61B and MOVITRAC B series inverters to a PROFIBUS DP-V1 network via SBus, supporting up to eight inverters per gateway. It runs on 24 V DC, carries an IP20 rating, and handles an operating temperature range from -10 to +60°C. As the lower-priced option, it's the pick if your drives are already from the SEW ecosystem, because the gateway was built to bridge them. The tradeoffs are its narrower scope: it focuses on PROFIBUS rather than CAN, and the model has been discontinued by SEW-Eurodrive, so the used market is the only path. If your cabinet has MOVIDRIVE or MOVITRAC B drives, this gateway is made for that pairing.
Final choice by use case
For a SEW drive cabinet that needs PROFIBUS DP-V1, the SEW DFP21B is the natural fit because it's built for MOVIDRIVE and MOVITRAC B series, casts a lower price, and is ready to bridge up to eight inverters via SBus. For a custom panel where you need a CAN/PROFIBUS interface card and want to stay independent of SEW's ecosystem, the Delta Tau ACC-72E is the card to start with, despite its higher price. If you're still torn, think about your drive inventory first: the SEW DFP21B offers its compatibility only to SEW drives, while the Delta Tau card gives protocol flexibility to whoever installs it.
