Modbus to OPC UA Bridge. Secure. Expandable. — The industrial edge controller that speaks your IT department's language.
Your OT equipment speaks Modbus — RTU or TCP. Your IT systems — SCADA, MES, ERP, cloud platforms — speak OPC UA. Getting them to talk to each other usually means custom code, complex gateways, or expensive middleware.
The BL191 eliminates all of that. It is an OPC UA server that collects Modbus data from your field devices and makes it available to any OPC UA client — automatically. No coding. No custom mapping. No additional software.
Think of it as your OT-to-IT bridge in a compact, expandable, industrial-grade package.
The BL191 collects data via Modbus RTU (RS485) or Modbus TCP (Ethernet) and automatically exposes it as OPC UA nodes. Your OPC UA client — whether it is SCADA, MES, MOM, ERP, or a cloud platform — simply connects and reads the data. No scripting. No complex address mapping. No custom OPC UA programming.
Security is not optional when connecting OT to IT. The BL191 supports X.509 certificates, AES-256 encrypted communication, and role‑based access policies. Compliant with the IEC62443 industrial cybersecurity standard. Your IT department will approve this one.
Choose 1, 2, or 3 Y Series I/O boards. Digital input/output, analog input/output, RTD (PT100/PT1000), thermocouple, pulse counting, pulse output, and serial port modules — all available. The BL191 collects local I/O data and exposes it as OPC UA nodes alongside your Modbus devices.
Why send every decision to the cloud or central PLC? The BL191 can execute local logic independently — conveyor start/stop, alarm triggering, conditional actions, timer-based control. Set up IF-THEN rules, register operations, and conditional actions directly through the web browser. No programming software required. Reduce latency. Reduce cloud costs. Keep your edge smart.
Have existing Modbus RTU devices on RS485 — sensors, meters, drives? Connect them to the BL191's isolated RS485 port. The BL191 reads Modbus RTU data and converts it to OPC UA automatically. Your OPC UA client sees everything as native nodes. No extra gateway. No additional configuration.
Two RJ45 ports with built‑in switch support line topology. Daisy‑chain multiple BL191 controllers or other Ethernet devices without an external switch. Less hardware. Less cabling. Simpler installation.
Designed for the real factory floor. Wide‑temperature operation from -40°C to +85°C. Electrical isolation, EMC/EMI protection, independent hardware watchdog, and reverse polarity protection. The BL191 survives where office equipment fails. IP30 protection, CE and FCC certified.
Open a browser. Type the IP address. Start configuring. Set up Modbus polling parameters, define OPC UA server settings, configure local logic rules — all through the built‑in web server. No client software. No driver installation. No training required.
Remote firmware upgrades and parameter configuration are built in. Update devices in the field without sending a technician. Reduce downtime. Lower service costs.
You are connecting your factory floor to higher‑level systems — MES for production tracking, ERP for resource planning, cloud platforms for analytics. Your field devices speak Modbus. Your IT systems speak OPC UA. The BL191 bridges the gap without custom development.
You are upgrading your SCADA system to an OPC UA‑enabled platform. Your existing field devices are Modbus‑based. Instead of replacing devices or building custom drivers, deploy BL191 as a Modbus‑to‑OPC‑UA gateway. Your new SCADA reads data through standard OPC UA. Your existing devices stay in place.
Monitor battery status, current, voltage, temperature, and alarms in energy storage systems. The BL191 collects data from Modbus devices, executes local alarms, and exposes everything via OPC UA to your central monitoring system. Wide temperature range ensures reliable operation in outdoor or unheated enclosures.
You need to bring HVAC, lighting, or access control data into an OPC UA‑based building management system. The BL191 collects Modbus data from building devices and serves it via OPC UA. No complex integrations. No custom drivers.
Your customers require OPC UA connectivity from your machines. Your machine uses Modbus internally. Add a BL191 to each machine — it collects internal Modbus data and provides an OPC UA server interface. Your machine becomes Industry 4.0 ready without a complete control system redesign.
| Encryption | AES-256 for secure data transmission |
| Authentication | X.509 certificate support |
| Access Control | Role‑based policies (read-only, read-write, admin) |
| Compliance | IEC62443 industrial cybersecurity standard |
📋 For complete technical specifications and Y Series I/O board selection, please see the EdgeIO Controller Selection Guide
| Model | BL191 |
| Description | OPC UA EdgeIO Controller, dual RJ45, isolated RS485, 1-3 Y Series I/O slots, web config, IEC62443 compliant, -40°C to +85°C |
