EtherCAT Remote I/O Module Reference Design
An illustrative EtherCAT slave remote I/O module reference design for the terminal layer (industrial terminals) of the five-layer network architecture: IN / OUT dual 10/100 ports in a daisy chain (EtherCAT-specific PHY ×2 + wide-temperature 10/100 transformers), digitally isolated 24V DI / DO field interfaces, a push-pull isolated supply and 24V cabinet power. Each position is marked with the VOOHU parts available, recommended part numbers and package pinouts.
Illustrative PCB ⇄ Schematic
Illustrative top-side view arranged by functional zone (not the actual layout). Red numbered dots mark positions VOOHU can supply. Click a component on the board, an entry in the index below or a part in the schematic to see recommended parts and package pinouts on the right.
Illustrative EtherCAT IN port topology: the left port of RJ45 J1 passes the wide-temperature 10/100 LAN transformer T1 (with a common-mode choke on the PHY side) and ESD D1 to the EtherCAT-specific PHY JL1111BI (U2), which connects to ESC port 0 over MII; the cable-side center taps go to chassis ground through 75Ω×2 + 1nF/2kV, with gas discharge tube GDT1 in parallel at the termination node, and the PHY-side center taps go to ground through 0.1µF. 10/100 uses only the TX / RX pairs and only 1 pair is drawn; series resistors, decoupling, the PHY crystal and the like are not drawn.
Board bill of materials
Summarized by position; click any row to locate it on the board above.
| No. | Zone | Position | Ref. | VOOHU category | Recommended part | Availability |
|---|---|---|---|---|---|---|
| 01 | A EtherCAT ports | Plain RJ45 1×2 (IN / OUT) | J1 | RJ45 Connector | WH56I3288RGGG0121101 | VOOHU |
| 02 | A EtherCAT ports | 10/100 LAN transformers ×2 (wide temperature) | T1 T2 | 10/100 LAN Transformers | WHS16002GA | VOOHU |
| 03 | A EtherCAT ports | Ethernet ESD array ×2 | D1 D2 | TVS ESD | WHALD03G4U | VOOHU |
| 04 | A EtherCAT ports | Port gas discharge tubes ×2 | GDT1 GDT2 | GDT | WHGD090V1P0B | VOOHU |
| 05 | B PHY ×2 | EtherCAT 10/100 PHY ×2 | U2 U3 | Ethernet PHY | JL1111BI-NI | VOOHU |
| 06 | B PHY ×2 | 25MHz crystal | Y1 | — | — | Non-VOOHU |
| 07 | C EtherCAT slave controller | EtherCAT slave controller (ESC, with MCU) | U1 | — | — | Non-VOOHU |
| 08 | C EtherCAT slave controller | ESI EEPROM | U4 | — | — | Non-VOOHU |
| 09 | D Field I/O (isolated) | DI / DO terminal block | J2 | — | — | Non-VOOHU |
| 10 | D Field I/O (isolated) | I/O port TVS ×2 | D3 D4 | TVS ESD | WHALD30E2B | VOOHU |
| 11 | D Field I/O (isolated) | Digital isolator | U5 | — | — | Non-VOOHU |
| 12 | D Field I/O (isolated) | Push-pull driver + isolated-side LDO | U6 | — | — | Non-VOOHU |
| 13 | D Field I/O (isolated) | Push-pull isolated power transformer | T3 | Push-Pull Transformers | WHST06K14A0 | VOOHU |
| 14 | E 24V power | 24V power terminal block | J3 | — | — | Non-VOOHU |
| 15 | E 24V power | Bidirectional input TVS | D5 | TVS ESD | WHTB058VA | VOOHU |
| 16 | E 24V power | Power-line common-mode choke (EMI) | L1 | Power Line Common Mode Chokes | WHAL-7060A-102T0 | VOOHU |
| 17 | E 24V power | Buck converters ×2 (24V→3.3V / core) | U7 U8 | — | — | Non-VOOHU |
| 18 | E 24V power | Molded inductors ×2 (DC-DC) | L2 L3 | Molded Inductors | WHYT0630 Series | VOOHU |
Resources & downloads
Board bill of materials
Reference designators, zones, VOOHU categories, recommended parts and availability for all 18 positions. Opens directly in Excel.
Datasheet collection
Datasheet PDFs for the VOOHU parts recommended on this board.
Design files & footprint library
Schematic, PCB, and VOOHU part footprints and 3D models.
Coming soonRequest the EtherCAT remote I/O module reference design full package
Includes the full-board position list, datasheets for the recommended VOOHU parts and position-by-position selection notes. For selection advice tailored to your bus protocol (EtherCAT / PROFINET / Modbus TCP), interface type (RJ45 / M12) or isolation rating, describe it in the requirements field. We reply within 24 hours on business days.
