LIOB‑590 I/O Controllers are IP-enabled, compact, programmable automation stations for LonMark Systems and BACnet/ IP networks, including also Modbus TCP and OPC, with bidirectional I/Os configurable as either input or output and integrated graphical visualization.

The LIOB‑590 I/O Controller is equipped with two Ethernet ports including a built-in Ethernet switch. This allows for building a daisy chained line topology of up to 20 devices, which reduces costs for network installation. Dual Ethernet port devices also allow the setup of a redundant Ethernet installation (ring topology), which increases reliability. The redundant Ethernet topology is enabled by the Rapid Spanning Tree Protocol (RSTP), which is supported by most managed switches.

Technology data points are automatically exposed as OPC tags for higher level OPC client applications or L‑WEB system via the integrated OPC server providing SSL encrypted web services (OPC XML‑DA) or UA Secure Conversation (OPC UA). The L‑IOB I/O Controllers further allow data exchange over global connections (network-wide data exchange), offer AST™ functions (Alarming, Scheduling, and Trending), store custom graphic pages for visualization in LWEB‑802/ 803, and can be seamlessly integrated in the LWEB‑900 Building Management System. LIOB‑590 I/O Controllers implement the BACnet Building Controller (B-BC) profile and are BTL certified.


  • Automation station with bidirectional I/Os configurable as either input or output
  • Programmable with L-STUDIO (IEC 61131‑3 or IEC 61499)
  • Room controller for up to 2 room segments
  • Node.js support* for easy IoT integration (e.g. Google calendar, Alexa & friends, multimedia equipment, …)
  • Dual Ethernet/ IP interface
  • Manual operation using the jog dial or VNC client
  • 128x64 graphic display with backlight
  • Local and remote access to information about device status and data points
  • Visualization of customized graphical pages through LWEB-900 (Building Management), LWEB-803 (Monitoring and Control), or LWEB-802 (Web Browser)
  • Support of dynamically created or static NVs
  • Support of user-defined NVs (UNVTs) and Configuration Properties (SCPTs, UCPTs)
  • Alarming, Scheduling, and Trending (AST™)
  • Event-driven e-mail notification
  • Integrated web server for device configuration and monitoring data points
  • Gateway functions including Smart Auto-Connect™
  • Access to network statistics
  • Compliant with CEA-709, CEA-852, and ISO/ IEC 14908 Standard (LonMark System)
  • Compliant with ANSI/ ASHRAE 135‑2012 and ISO 16484‑5:2012 standard
  • Supports BACnet/IP
  • B-BC (BACnet Building Controller) functionality, BTL certified
  • BACnet Client Function (Write Property, Read Property, COV Subscription)
  • BACnet Client Configuration with configuration tool (scan and EDE import)
  • Supports IP-852 (Ethernet/ IP)
  • Math objects to execute mathematical operations on data points
  • Built-in OPC XML‑DA and OPC UA server
  • Stores customized graphical pages
  • Stores user-defined project documentation

*requires L-IOT1 software license

Ordering number: 
Supply input: 24Vac/24Vdc
Technology: Multiprotocol
Field bus: Multiprotocol
Input names: 
20 Universal Input/Outputs

Local Operation and Override

All L‑IOB I/O Controllers are equipped with an LCD display (128x64) with backlight and jog dial for manual local operation and override. Device and data point information is displayed in text form and via graphical symbols.


IoT Integration:

The IoT function (Node.js) allows connecting the system to almost any cloud service, either for uploading historical data to analytics services, delivering alarm messages to alarm processing services or operating parts of the control system over a cloud service (e.g., scheduling based on Web calendars or booking systems). Processing Internet information such as weather data in forecast-based control is also possible. Finally, the JavaScript kernel also allows implementing serial protocols to non-standard equipment in primary plant control.


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