This selection guide covers all BL21x Series distributed I/O couplers (BL210, BL211, BL212, BL214) and compatible N Series I/O modules. Use this page to quickly find the right combination for your industrial automation application, whether you need Modbus TCP, OPC UA, EtherNet/IP, or EtherCAT connectivity.
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BL210 Modbus TCP Coupler | BL211 OPC UA Coupler | BL212 EtherNet/IP Coupler | BL214 EtherCAT Coupler
Choose the coupler based on your fieldbus protocol requirements. All couplers support up to 32 I/O modules and feature dual Ethernet ports with integrated switch, web-based configuration, and DIN-rail mounting.
Protocol: Modbus TCP
Ideal for integrating legacy serial devices into a Modbus TCP network. Compatible with Siemens, Schneider Electric, Keyence, Codesys, Inovance, Delta, and other Modbus TCP masters.
Protocol: OPC UA + Modbus TCP
Ideal for IIoT and Industry 4.0 applications requiring secure, platform-independent data exchange.
Protocol: EtherNet/IP
Ideal for Rockwell Automation and other EtherNet/IP-based control systems.
Protocol: EtherCAT
Ideal for high-performance motion control and real-time automation applications.
The BL210, BL211, BL212, and BL214 couplers are compatible with all N Series I/O modules listed below. You can mix and match up to 32 modules per coupler.
| Model | Channels | Signal Type |
|---|---|---|
| N1161 | 16 | NPN (low level trigger) |
| N1162 | 16 | PNP (high level trigger) |
| N1163 | 16 | Dry contact |
| N1321 | 32 | NPN (low level trigger) |
| N1322 | 32 | PNP (high level trigger) |
| N1323 | 32 | Dry contact |
| Model | Channels | Signal Type |
|---|---|---|
| N2161 | 16 | PNP |
| N2162 | 16 | NPN |
| N2321 | 32 | PNP |
| N2322 | 32 | NPN |
| N2084 | 8 | Relay output |
| Model | Channels | Signal Type |
|---|---|---|
| N3081 | 8 | 0-20mA / 4-20mA input |
| N3083 | 8 | 0-5V / 0-10V single-ended input |
| N3046 | 4 | ±5V / ±10V differential input |
| Model | Channels | Signal Type |
|---|---|---|
| N4081 | 8 | 0-20mA / 4-20mA output |
| N4086 | 8 | ±5V / ±10V output |
| Model | Channels | Signal Type |
|---|---|---|
| N5041 | 4 | 3-wire PT100 |
| N5042 | 4 | 3-wire PT1000 |
| N5043 | 4 | 4-wire PT100 |
| N5044 | 4 | 4-wire PT1000 |
| Model | Channels | Signal Type |
|---|---|---|
| N5088 | 8 | TC (B/E/J/K/N/R/S/T) |
| Model | Channels | Function |
|---|---|---|
| N9081 | 8 | 3-channel pulse counter + 5-channel DI |
| N9082 | 8 | 6-channel pulse output + 2-channel DO |
| N9083 | 8 | 2-channel pulse output (pulse count control) + 4-channel DI + 2-channel DO |
| N7021 | 2 | When more than 20 IO boards are selected, an additional Power Module is required |
| System Power Supply | 24 VDC |
| System Input current | 96mA @ 24VDC |
| Internal Bus Voltage | 5VDC |
| Current consumption (I/O Modules) | Maximum 2000mA@5VDC |
| Max I/O Modules | 32 modules |
| Ethernet Ports | 2 x RJ45 |
| Ethernet Speed | 10/100 Mbit/s |
| Cable Type | Cat 5 STP, max 100m |
| Wiring Technology | Spring-cage connection (tool-free) |
| Wire Gauge | 0.3 – 2.5 mm² (AWG 22-14) |
| Operating Temperature | -20°C to 55°C |
| Storage Temperature | -40°C to 70°C |
| Relative Humidity | 5% – 95% non-condensing |
| Protection Rating | IP20 |
| Mounting | DIN-35 rail |
| Dimensions (W x H x D) | 26 x 74.9 x 104.5 mm |
| Housing Material | Polycarbonate, Nylon 6.6 |
After reviewing the selection guide above, click on any coupler below to view detailed product specifications, ordering information, and technical documentation:
For technical support, custom configuration assistance, or volume pricing, please contact Shenzhen Beilai Technology.
