Model Explanation

51309236‑325: Honeywell Material Number

51309236 = UCN I/O Link Module (IOLM) series

325 = Standard type, redundant support, industrial-grade temperature version

Module Model: MC-IOLM02 (corresponding mainstream model)

MC = Module Card (control board)

IOLM = Input/Output Link Module (input/output link module)

02 = Hardware version (Rev.02, standard industrial version) Technical Specifications

Communication Network: UCN (Universal Control Network, Honeywell Special Control Network)

Communication Rate: 5 Mbps (UCN standard rate)

Communication Distance: Up to 2 km (coaxial cable, relay extension)

Topology: Token Bus (Token-Passing Bus)

Redundancy Capability: Supports dual redundant I/O links (undisturbed switching)

Electrical Isolation: Control logic is isolated from the I/O side (resistant to ground loop interference)

Power Supply: 24 VDC (±10%), UCN backplane power supply

Operating Temperature: 0°C ~ +60°C (standard industrial grade)

Storage Temperature: -40°C ~ +85°C

Humidity: 5% ~ 95% RH (no condensation)

Size: 220 × 150 × 30 mm

Weight: 0.7 kg

Certifications: CE, UL, CSA, RoHS

Interfaces and Communications

UCN Side: BNC coaxial interface (connects UCN network, redundant dual interfaces)

I/O Side: High-density flat cable interface (connects LLMUX, analog/digital IOP cards)

Status Indicators: PWR (green), LINK (green), FAULT (red), redundant status LED

Configuration: DCS software configures UCN address, redundant mode, communication parameters, I/O mapping

Hot Swap: Supported (online replacement does not affect system operation) Core function

UCN-I/O High-Speed Data Bridging: Enables bidirectional real-time data exchange between the controller (APM/HPM) and the field I/O cards, ensuring low-latency transmission of control instructions and field collected signals.

Dual Redundant Communication Assurance: Supports dual-link redundant configuration, with automatic switching in case of a single link failure, with a switching time of less than 100 ms, eliminating communication interruptions, and suitable for critical control loops.

Electrical Isolation Anti-Interference: High-voltage electrical isolation between the control side and the I/O side, suppressing industrial environment EMI/RFI interference and ground loop current, ensuring stable communication under harsh conditions.

Comprehensive Fault Diagnosis and Alarm: Real-time monitoring of link failures, signal attenuation, power abnormalities, and redundant switching status, using LEDs and system alarms to quickly locate problems, simplifying maintenance.

Flexible I/O Expansion Adaptation: Compatible with LLMUX (thermocouple / thermoresistor), analog input/output, digital input/output, and other full series of UCN IOP cards, suitable for mixed measurement point dense scenarios. Applicable scenarios

Industry: Petrochemicals, thermal power / nuclear power, metallurgy, cement, glass, pharmaceuticals

Applications: UCN network setup for TDC 3000/Experion PKS DCS system, communication between controllers and remote I/O subsystems, redundancy communication guarantee for critical control loops, data interaction for large-scale mixed I/O measurement points (TC/RTD/AI/AO/DI/DO).

Compatible systems: Honeywell TDC 3000, TPS, Experion PKS (C200/C300), specifically for UCN network architecture.