The BL211 is a distributed I/O coupler that supports both Modbus TCP and OPC UA. A single unit can expand to up to 32 N-series I/O modules, delivering a maximum of 1,024 signal points. It directly addresses two of the most persistent headaches on the factory floor: module failure without the hassle of rewiring, and reliable communication even under heavy vibration.
Detachable Terminal Blocks – Replace Modules Without RewiringThe N-series I/O boards feature a design that physically separates the front-end wiring terminals from the electronic module. When a module fails, you simply unplug the old unit and snap in the new one – all field wiring remains untouched. No rewiring, no re-termination. Replacement time drops from hours to minutes, minimising production downtime.
Metal Spring Contacts – Vibration-Resistant and Reliable ConnectionsModules interconnect via large-area metal spring contacts, which offer a much larger conductive cross-section than traditional pin headers. This reduces signal loss and maintains a secure connection even in high-vibration environments. Combined with an industrial-grade internal bus design, the system runs stably in electrically noisy settings with numerous VFDs and motors, virtually eliminating drop-outs and lock-ups.
High Integration – One Unit Does the Work of ManyWith support for 8, 12, or 32 channel I/O boards, a single BL211 coupler handles up to 1,024 I/O points, removing the need for multiple host units. It also includes one onboard RS485 port for direct Modbus RTU device polling, while simultaneously supporting Modbus TCP and OPC UA uploads for seamless integration with PLCs, SCADA, MES, and cloud platforms.
Dual Ethernet Ports with Daisy-Chain – Save Switches and Simplify CablingThe BL211 is equipped with two Ethernet ports that incorporate a built-in switch function, enabling daisy-chain topology. Multiple units can be linked via standard network cables without external switches, reducing cabling complexity and overall system cost.
Protocol Capabilities – Modbus Acquisition and OPC UA Upload in One StepFor manufacturers pursuing digital transformation, this means legacy Modbus devices can be directly connected to SCADA, MES, digital twin, and other IT systems without replacement.
N Series I/O Modules – Full Signal Coverage
The BL211 is compatible with the complete N series I/O portfolio, covering all common industrial signal types:
|
Items |
Description |
Items |
Description |
|
N1161 |
16-channel DI, NPN |
N3046 |
4-channel 16-bit AI, differential, ±5 V/±10 V |
|
N1162 |
16-channel DI, PNP |
N4081 |
8-channel 16-bit AO, 0/4–20 mA |
|
N1163 |
16-channel DI, dry contact |
N4086 |
8-channel 16-bit AO, ±5 V/±10 V |
|
N1321 |
32-channel DI, NPN |
N5041 |
4-channel RTD, 3-wire PT100 |
|
N1322 |
32-channel DI, PNP |
N5042 |
4-channel RTD, 3-wire PT1000 |
|
N1323 |
32-channel DI, dry contact |
N5043 |
4-channel RTD, 4-wire PT100 |
|
N2161 |
16-channel DO, PNP |
N5044 |
4-channel RTD, 4-wire PT1000 |
|
N2162 |
16-channel DO, NPN |
N5088 |
8-channel thermocouple (TC) |
|
N2321 |
32-channel DO, PNP |
N7021 |
2-channel power supply module |
|
N2322 |
32-channel DO, NPN |
N9081 |
3-channel pulse counter + 5 DI |
|
N2084 |
8-channel DO, relay |
N9082 |
6-channel pulse output + 2 DO |
|
N3081 |
8-channel 16-bit AI, single-ended, 0/4–20 mA |
N9083 |
2-channel pulse output (with pulse-count control) + 4 DI + 2 DO |
|
N3083 |
8-channel 16-bit AI, single-ended, 0–5/10 V |
|
|
Where It Works Best
Equipment Manufacturers – packaging machines, injection moulding, machine tools, custom equipmentWe welcome you to reach out to BLIIOT for more details, technical specifications, or a tailored proposal.
