Honeywell SC-UCNN11 51307573-176 RTU2020 Redundant Controller Module

Honeywell SC-UCNN11 51307573-176 RTU2020 Redundant Controller Module

The Honeywell SC-UCNN11 (Manufacturing Part Number: 51307573-176) is a high-availability, dual-redundant processing unit engineered specifically for Honeywell’s ControlEdge RTU2020 system. Tailored for mission-critical remote automation, offshore topside facilities, pipeline manifolds, and maritime machinery automation, the SC-UCNN11 ensures uninterrupted deterministic control through continuous hardware-based state mirroring and zero-bump failover.

Unlike non-redundant variants (such as the SC-UCMX01), the SC-UCNN11 integrates dual Controller Processor Modules (CPMs) mounted directly onto a dedicated Redundant Input/Output Termination Assembly (IOTA). The module manages real-time supervisory loops, high-density data logging, and low-power operations without requiring external network switches for controller synchronisation.

Model Details

• Brand / Manufacturer: Honeywell Process Solutions
• Hardware Model: SC-UCNN11
• Manufacturer Part Number (MPN): 51307573-176
• Assembly Architecture: Redundant CPM Pair with Dedicated RTU2020 Redundancy IOTA Base
• Cross References / Direct Alternates:
  • Honeywell 51307573-176 (Assembly Core)
  • Honeywell SC-UCNN11-000 (Catalog Assembly)
  • Honeywell SC-UCMX01 (Non-redundant 28-I/O counterpart)
  • Honeywell 51307573-276 / 51307573-125 (Sub-tier board/chassis cross-references)

Key Features

1. Native Redundancy Without Hardware Switches: Dual active-standby CPM configuration mirrors system state table data in real time via an integrated backplane bus, eliminating single points of failure without external Ethernet switches.
2. Ultra-Low Operational Power Profile: Draws as little as 1.9 W per controller core, making it suitable for uncrewed offshore buoys, remote wellpads, and solar- or battery-powered installations.
3. Marine & Harsh Environment Hardening: ISA-71.04 Class G3 conformal coating protects against airborne hydrogen sulphide, salt mist, condensation, and shipboard vibration profiles.
4. Integrated Multi-Protocol Gateway: Natively communicates across Modbus RTU/TCP, DNP3, and Honeywell Experion CDA protocol stacks, complete with local Sequence of Events (SOE) timestamping to 1 ms accuracy.
5. Non-Volatile Historical Data Buffering: Provides internal non-volatile logging with capacity for over 20 years of retention, plus support for up to 32 GB microSD storage to prevent data gaps during telecommunication backhaul blackouts.

Marine & Industrial Applications

• Offshore Wellhead & Platform Safety Systems: Supervisory monitoring of emergency shutdown valves (ESDV), hydraulic power units (HPU), and multi-well test separators.
• Marine Bilge, Ballast, and Fuel Transfer Management: Real-time tank level monitoring, automated manifold control, and sequential ballast shifting with high vibration tolerances.
• Custody Transfer & Gas Flow Metering: High-speed calculation loops run via optional AGA/API measurement libraries in upstream marine terminals and subsea pipeline risers.
• Remote Marine Electric Propulsion Telemetry: Distributed field communication concentrator monitoring propulsion variable frequency drives (VFDs) and marine diesel auxiliary gensets.
• FPSO Topside Remote Telemetry Units: Data acquisition node concentrating HART digital field instruments across Class I, Div 2 / Zone 2 hazloc areas.

System Compatibility

• The Honeywell SC-UCNN11 integrates into the ControlEdge ecosystem and interfaces with the following hardware, firmware, and software revisions:
• Engineering Tooling: ControlEdge Builder R140, R150, R151, and R170+ releases.
• SCADA / DCS Integration: Honeywell Experion® PKS (R430, R500, R510, R520) via direct Control Data Access (CDA) or OPC UA; third-party SCADA via standard DNP3 and Modbus TCP.
• Expansion I/O Base Units:
  • SC-UMIX01: 28-channel mixed input/output module (8 AI, 2 AO, 10 DI, 6 DO, 2 PI/DI).
  • SC-TEPR01 / SC-TEPL01: Expansion Left and Right Termination Plates for multi-row DIN rail deployments.
• Field Instrument Protocols: HART v7 passthrough supported over expansion I/O channels.

Frequently Asked Questions

What is the operational difference between the Honeywell SC-UCNN11 and the SC-UCMX01?

The Honeywell SC-UCNN11 is an exclusively redundant controller configuration consisting of a dual-controller carrier assembly and dual processors running active-standby software synchronization. The SC-UCMX01 is a non-redundant single-controller module featuring 28 fixed onboard I/O channels. For mission-critical marine or remote applications where hardware failure is intolerable, the SC-UCNN11 is required.

Can the SC-UCNN11 operate without an expansion I/O module?

Yes, the SC-UCNN11 functions independently as a redundant communications gateway, data concentrator, and supervisory RTU calculating logic, holding network routing, and serving data via Modbus, DNP3, and OPC. However, if direct field instrument loop wiring (AI/AO/DI/DO) is needed, it must be paired with SC-UMIX01 expansion modules.

How does failover synchronization work during an active CPU fault?

Failover is bump-free and instantaneous. The secondary standby module continuously tracks runtime variables, database records, and program scan logic via the high-speed redundant backplane bus. If the primary processor detects a watchdog timeout, memory fault, or power rail disruption, the standby core assumes bus control within one program scan without dropping communication links or interrupting field outputs.

Does the SC-UCNN11 support low-power solar or battery operation?

Yes. With an average operating consumption starting at approximately 1.9 W per CPM module, the ControlEdge RTU2020 platform is optimized for low-power remote terminal automation, including solar arrays, wind-powered navigation buoys, and wellhead batteries.

What tools are required to program and configure the Honeywell 51307573-176?

Configuration and logic deployment are performed using Honeywell ControlEdge Builder, which complies with IEC 61131-3 standards (supporting Ladder Diagram, Function Block Diagram, Structured Text, and Sequential Function Chart). Configuration files can also be mapped directly into the Experion® PKS engineering environment.