Choosing a fieldbus gateway for an industrial network usually comes down to the protocol you need to bridge and the physical shape that fits in your cabinet. The four products here cover PROFIBUS DP-V1, PROFIBUS/Ethernet, CAN/PROFIBUS, and a 1-port serial-capable unit. Listed prices span a wide range, so separating budget from interface compatibility is the first useful step.
Quick take
If you need PROFIBUS connectivity for SEW drives, the SEW-Eurodrive DFP21B/UOH11B is the one to start with. If you need PROFIBUS-to-Ethernet with a single channel, the Softing FG-100-PB fits that role. If CAN and PROFIBUS both need a home in the same card-style interface, the Delta Tau ACC-72E is the interface card to consider. If you need a 1-port fieldbus gateway with RS-232/422/485 serial ports and 12-48 VDC input, the Moxa MGATE 4101-MB-PBS is the top-of-range option.
Price comparison
| Product | Listed price | Price bar |
|---|---|---|
| SEW-Eurodrive DFP21B/UOH11B PROFIBUS DP-V1 Gateway | USD 155.00 | |
| Softing FG-100-PB PROFIBUS/Ethernet Gateway | USD 233.89 | |
| Delta Tau ACC-72E CAN/PROFIBUS Interface Card | USD 404.99 | |
| Moxa MGATE 4101-MB-PBS Fieldbus Gateway | USD 969.00 |
At a glance
| Product | Condition | Interface focus |
|---|---|---|
| SEW-Eurodrive DFP21B/UOH11B | Used | PROFIBUS DP-V1 for SEW MOVIDRIVE MDX61B and MOVITRAC B |
| Softing FG-100-PB | New - Open box | PROFIBUS/Ethernet, 1 channel |
| Delta Tau ACC-72E | Used | CAN/PROFIBUS interface card |
| Moxa MGATE 4101-MB-PBS | Open box | 1-port fieldbus gateway with RS-232/422/485 |
Product notes
SEW-Eurodrive DFP21B/UOH11B
At USD 155.00, this is the lowest listed price in the group, but it is also the most specific. The SEW-Eurodrive DFP21B/UOH11B is a used PROFIBUS DP-V1 fieldbus interface/gateway designed around SEW MOVIDRIVE MDX61B and MOVITRAC B inverters. It carries a 24 V DC supply, 0.3 A current consumption, IP20 protection, and the ability to link up to eight inverters to a PROFIBUS DP-V1 network via SBus. If your cabinet already uses SEW's MOVIDRIVE or MOVITRAC B line, this is a direct fit at the lowest listed price. If you need a general-purpose bridge for mixed brands or a different fieldbus, the drive-specific scope is the limitation.
Softing FG-100-PB
At USD 233.89, the Softing FG-100-PB is the second-lowest price and the only unit listed as New - Open box. The model name points to a 1-channel PROFIBUS/Ethernet gateway, which makes it a sensible pick when you need to attach a PROFIBUS segment to an Ethernet control network without extra channel complexity. The 1-channel design keeps the decision simple, but it also means the unit is specifically aimed at one gateway task. If your network requires CAN/PROFIBUS bridging instead, the Delta Tau ACC-72E is the product in this comparison that explicitly carries that pairing.
Delta Tau ACC-72E
At USD 404.99, the Delta Tau ACC-72E is the second-highest listed price and the only card-format product here. Its title identifies it as a Fieldbus Gateway CAN/PROFIBUS Interface Card, and the country of origin is listed as the United States. If your architecture is built around using peripheral cards rather than standalone boxes, this is the option that explicitly matches that approach. The condition is used, so the trade-off is paying more than the Softing or SEW gateways for a card-style interface. The card format is the main detail to match against your hardware.
Moxa MGATE 4101-MB-PBS
At USD 969.00, the Moxa MGATE 4101-MB-PBS is the highest-price listing in this group. It is an open-box 1-port fieldbus gateway with 12-48 VDC input and RS-232/422/485 serial ports, which makes it useful if your control line relies on serial networking rather than drive-specific SBus wiring. The DC input range is broader than the 24 V supply on the SEW gateway. The trade-off is the price gap: this listing costs more than twice the Delta Tau card and more than four times the Softing gateway. Choose it when you need that specific Moxa serial gateway role and can justify the top-of-range budget.
Final recommendation by use case
- Drive-specific PROFIBUS DP-V1 gateway: SEW-Eurodrive DFP21B/UOH11B.
- Single-channel PROFIBUS/Ethernet bridge: Softing FG-100-PB.
- CAN/PROFIBUS in card format: Delta Tau ACC-72E.
- 1-port serial fieldbus gateway with 12-48 VDC: Moxa MGATE 4101-MB-PBS.
Before choosing, weigh the listed condition. Used units can be a strong fit when they match the exact drive family, while open-box units offer a middle ground in condition at a higher listed price.
