When you need to connect variable-frequency drives to a plant-wide control network, the fieldbus gateway in the cabinet is the translator that makes everything talk. The two options here sit at different ends of the industrial networking fieldbus spectrum: one is a used PROFIBUS DP-V1 gateway built for SEW MOVIDRIVE and MOVITRAC B drives; the other is a new Ethernet IP module from Invertek. Both are priced within a couple of dollars of each other, but the right pick depends on the network protocol your controllers speak.
Quick Verdict
For a plant already wired for PROFIBUS and running SEW drives, the SEW-Eurodrive DFP21B/UOH11B is the obvious choice. It is a used, discontinued unit, but it is still a proven gateway for MOVIDRIVE/MOVITRAC B inverters. If you'd rather have a brand-new module and your network is Ethernet IP, the Invertek OPT-2-ETHEG-IN is the safer bet. The price difference is only about two dollars, so the decision comes down to protocol and condition.
| Feature | SEW-Eurodrive DFP21B/UOH11B | Invertek OPT-2-ETHEG-IN |
|---|---|---|
| Network | PROFIBUS DP-V1 | Ethernet IP |
| Condition | Used | New |
| Compatibility | SEW MOVIDRIVE/MOVITRAC B | Invertek PLC Ethernet module |
| Price | USD 155.00 | USD 152.98 |
Where the SEW-Eurodrive Wins
The SEW gateway has the edge in compatibility for existing SEW installations. It is designed to link MOVIDRIVE MDX61B and MOVITRAC B series inverters to PROFIBUS DP-V1 networks over SBus, and it can handle up to eight inverters per gateway. The specification sheet lists a 24 V DC supply, IP20 protection, and an operating range of -10 to +60°C, which makes it a solid fit for control cabinets in typical factory environments. If you are already in the SEW ecosystem, this is a natural match for a legacy network.
Where the Invertek Wins
The Invertek module counters with its condition: it is new in box, which removes the uncertainty that comes with used hardware. It also speaks Ethernet IP, a protocol that is widespread in modern automation and does not require a dedicated PROFIBUS master card. For a control system being built today, an Ethernet IP fieldbus gateway is often the simpler integration path. The unit is listed as a PLC Ethernet module, so it is meant to sit on an Ethernet IP network and take direction from a Programmable Logic Controller.
SEW-Eurodrive DFP21B/UOH11B
If your control architecture is PROFIBUS DP-V1, this used gateway from SEW-Eurodrive gives you a direct connection between the network and SEW MOVIDRIVE MDX61B or MOVITRAC B series inverters. It operates on 24 V DC, draws about 0.3 A, and is rated for an ambient temperature range of -10 to +60°C with IP20 protection. The gateway passes commands over SBus and can link up to eight inverters to one PROFIBUS segment. Keep in mind that the unit is used and has been discontinued by SEW-Eurodrive, so you are relying on the existing hardware rather than future factory support. For a legacy SEW line that already runs PROFIBUS, that trade-off is often acceptable because the integration path is already proven.
Invertek OPT-2-ETHEG-IN
The Invertek OPT-2-ETHEG-IN is a new Ethernet IP fieldbus gateway module, and that new-in-box status is its biggest selling point. It carries the Invertek model number OPT-2-ETHEG-IN and is listed as a PLC Ethernet module, which means it is designed to sit on an Ethernet IP network rather than a PROFIBUS segment. For a control system being built around a modern PLC, an Ethernet IP gateway can be the simpler path because it uses the same networking language many controllers already speak. The obvious limitation is that the listing does not specify which drives or controllers the module is compatible with, so you'll need to confirm the match before installation. If you want new hardware and your network runs Ethernet IP, this module is the one to buy.
Final Choice by Use Case
Choose the SEW-Eurodrive DFP21B/UOH11B if you are maintaining SEW MOVIDRIVE or MOVITRAC B drives on an existing PROFIBUS DP-V1 network and you are comfortable with used, discontinued hardware. Choose the Invertek OPT-2-ETHEG-IN if you are setting up a new Ethernet IP control network and want a brand-new module from a current product line.
