The EC4-EP21 EtherCAT coupler is the connection between the field bus grade EtherCAT protocol and the EtherCAT low-profile module. A station consists of a coupler and multiple EtherCAT Slim modules.
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The EC4-EP21 EtherCAT coupler is the connection between the field bus grade EtherCAT protocol and the EtherCAT low-profile module. A station consists of a coupler and multiple EtherCAT Slim modules.

| EMS Protection | |
|---|---|
| EFT (IEC 61000-4-4) | Signal: 1 KV Class B; Power: 1 KV Class B |
| ESD (IEC 61000-4-2) | 4 KV Contact for Each Terminal |
| Surge (IEC 61000-4-5) | 1 KV Class A |
| EtherCAT | |
|---|---|
| Ports | EtherCAT, 2 x RJ-45 (1 IN; 1-OUT) |
| Node ID | Up to 256 |
| Distance Between Stations | Max.100 m (100BASE-TX) |
| Data Transfer Medium | Ethernet/EtherCAT Cable (Min. CAT 5), Shielded |
| Power | |
|---|---|
| Input Range | +24 VDC |
| Consumption | 2W Max |
| Mechanical | |
|---|---|
| Casing | Plastic |
| Dimensions (mm) | 25 x 108 x 93 (W x L x D) |
| Installation | DIN-Rail or Wall Mounting |
| Environment | |
|---|---|
| Operating Temperature | -25 ~ +75°C |
| Storage Temperature | -30 ~ +80°C |
| Humidity | 10 ~ 90% RH, Non-condensing |
| EC4-EP21 CR | EtherCAT coupler with ID switch (RoHS) |