Quick Take
When a PROFIBUS segment has to talk to an Ethernet controller, or a Modbus device needs a seat on a Profibus network, a fieldbus gateway makes the connection. These four gateways show how different the answers can look: two open-box Moxa units, a Softing PROFIBUS/Ethernet gateway, and a used Bürkert Ethernet fieldbus gateway. The listed prices cover a wide spread, and the descriptions point to different serial, Modbus, and PROFIBUS roles. Use the comparison below to match a gateway to your protocol and condition tolerance.
Listed Price Comparison
| Product | Listed price | Price bar |
|---|---|---|
| Moxa MGATE 4101-MB-PBS (Open box) | USD 969.00 | |
| Moxa 4101-MB-PBS (Open box) | USD 869.00 | |
| Softing FG-100-PB (New - Open box) | USD 233.89 | |
| Bürkert 00307390 / ME43 (Used) | USD 249.99 |
Decision Matrix
| Product | Best for | Keep in mind |
|---|---|---|
| Moxa MGATE 4101-MB-PBS | Serial interfaces on a 1-port gateway | Highest listed price in this set |
| Moxa 4101-MB-PBS | Modbus-to-Profibus slave conversion | Open box; listed data rate 230.4 Kbps |
| Softing FG-100-PB | PROFIBUS/Ethernet bridging at a lower listed price | New - Open box |
| Bürkert 00307390 / ME43 | A working-pull Ethernet fieldbus gateway | Used condition; working pull |
Product Notes
Moxa MGATE 4101-MB-PBS (Open Box)
The Moxa MGATE 4101-MB-PBS is a 1-port fieldbus gateway with RS-232, RS-422, and RS-485 serial support and a 12-48VDC power range, and it is offered as an open-box unit. At USD 969.00, it carries the highest listed price in this group. For a network that needs serial connectivity on a single port with a Moxa part number, this unit belongs in the conversation. Just be prepared for the open-box condition and the higher listed price compared with the other three gateways here.
Moxa 4101-MB-PBS (Open Box)
At USD 869.00, the Moxa 4101-MB-PBS is presented as a Modbus-to-Profibus slave gateway in a 1-port drop-in module, with a listed data rate of 230.4 Kbps and a 0 to 55°C temperature range. If your Modbus device needs to appear as a Profibus slave on a network, this is the Moxa option to size up. The open-box condition is the main caveat; the unit is not new, and the price is close to the top of this set.
Softing FG-100-PB (New - Open Box)
The Softing FG-100-PB is the straightforward PROFIBUS/Ethernet bridge here: one channel, PROFIBUS to Ethernet, and a listed price of USD 233.89. That puts it at the lowest listed price in this four-product comparison. It is listed as New - Open box, so its condition is spelled out before you buy. If your network simply needs PROFIBUS to reach an Ethernet segment, this unit gets that job done without extra Modbus or serial conversion steps. The trade-off is that its listed scope stays within that PROFIBUS/Ethernet pairing.
Bürkert 00307390 / ME43 (Used)
The Bürkert 00307390 / ME43 is a used industrial Ethernet fieldbus gateway, described as a working pull that will come as pictured. At USD 249.99, it sits near the lower end of the price spread. If your main requirement is getting a working-pull Bürkert unit into a network without paying the higher prices on this page, this is a credible candidate. The used condition is the main limitation: it is not new, and the unit is being sold as a pull rather than a factory-fresh part.
Final Recommendation by Use Case
Match the gateway to the protocol pair you actually have. For a dedicated PROFIBUS-to-Ethernet bridge at the lowest listed price in this set, the Softing FG-100-PB is the most straightforward pick. For Modbus-to-Profibus slave conversion, the Moxa 4101-MB-PBS is the one to choose. For serial RS-232, RS-422, or RS-485 support with a Moxa unit, the MGATE 4101-MB-PBS fits, provided the open-box condition and the higher listed price are acceptable. And for a used working-pull Ethernet fieldbus gateway from Bürkert at the lower end of the price range, the Bürkert 00307390 / ME43 is the candidate to start with.
