Deciding on a fieldbus gateway for your industrial networking fieldbus setup usually comes down to two questions: what equipment do you need to connect, and how much do you want to spend. The WENGLOR ZAG73AN02 and the SEW-Eurodrive DFP21B/UOH11B both bridge devices to a PROFIBUS DP network, but they take different routes to get there.
Quick verdict
If you're running SEW MOVIDRIVE or MOVITRAC B series inverters, the SEW-Eurodrive DFP21B/UOH11B is the direct, budget-savvy pick. It's built specifically to feed those drives into a PROFIBUS DP-V1 network, and it costs well under the alternative. For setups that need to connect legacy equipment to a PROFIBUS DP network, the WENGLOR ZAG73AN02 is the better fit, especially if you'd rather not buy used.
At a glance
| Product | Listed Price | Condition | Connectivity |
|---|---|---|---|
| WENGLOR ZAG73AN02 | USD 361.20 | New - Open box | RS-232 to PROFIBUS DP |
| SEW-Eurodrive DFP21B/UOH11B | USD 155.00 | Used | PROFIBUS DP-V1 via SBus |
Where each product wins
For the right bridge to older equipment plus a fresh unit, the WENGLOR ZAG73AN02 takes the lead. It gives you a direct connection path to PROFIBUS DP that many legacy machines need, and it arrives without the wear of a used part.
For SEW drive integration and cost control, the SEW-Eurodrive DFP21B/UOH11B wins. It's designed for MOVIDRIVE MDX61B and MOVITRAC B series inverters, linking up to eight drives via SBus to a PROFIBUS DP-V1 network. And its price tag is significantly lighter.
Product notes
WENGLOR ZAG73AN02 FIELDBUS GATEWAY BH0229
Choose the WENGLOR ZAG73AN02 when your PROFIBUS DP network needs to talk to RS-232 serial equipment. The listing spells out the role: it's an RS-232 to PROFIBUS DP gateway, ideal for retrofitting older devices that still rely on serial communication. It's also a new open-box unit, so you're getting a fresh item without the wait for a full new build. The trade-off is the price-at USD 361.20, it's the more expensive of the two. And its connectivity focus is serial, so if you're trying to link SEW inverters, this isn't the purpose-built solution for that job. Keep this in mind for serial-to-fieldbus bridging, not for SEW drive integration. If your factory floor has legacy machines with RS-232 ports, this gateway is the cleaner path to modern PROFIBUS control.
SEW-Eurodrive DFP21B/UOH11B PROFIBUS DP-V1 Fieldbus Gateway MOVIDRIVE MOVITRAC
When you're standardizing on SEW MOVIDRIVE MDX61B or MOVITRAC B series inverters, the DFP21B/UOH11B is the gateway that fits. It connects those drives to PROFIBUS DP-V1 via SBus, handling up to eight inverters per gateway, which is a strong reason to choose it. The unit is used, and it's been discontinued per the listing, so you're buying a legacy part-that's the limitation to weigh. But the specifications are clear: it runs on 24 V DC, pulls 0.3 A, operates from -10 to +60°C, and carries an IP20 rating. If your panel is indoors and dry, that's ample protection. The price is the saving grace-it's well under the WENGLOR, making it easier to justify for a drive network. If you can work with a used component and want a lower-cost route to PROFIBUS for your SEW drives, this is the gateway to build around.
Final choice by use case
For SEW-centric plants: The SEW-Eurodrive DFP21B/UOH11B is the clear winner. Its SBus design for MOVIDRIVE/MOVITRAC B inverters plus its lower price make it the practical option.
For legacy equipment connections: The WENGLOR ZAG73AN02 is the one, thanks to its direct bridge to PROFIBUS DP.
For budget-limited upgrades: Stay with the SEW if you can adapt, but if you need the specific interface the WENGLOR provides, the higher price buys exactly what you need.
