Honeywell CC-SCMB05 Memory Backup Module 51308657-106 REV A

Honeywell CC-SCMB05 Memory Backup Module (51308657-106 / 51308658-276 REV: A)

The Honeywell CC-SCMB05 is a dedicated non-volatile memory backup module engineered specifically for the Honeywell Experion® Process Knowledge System (PKS) Series C automation architecture. Deployed in conjunction with the C300 Controller (specifically C300v5 execution platforms) and associated Input/Output Termination Assemblies (IOTAs), the CC-SCMB05 provides battery-backed power retention to the controller’s volatile dynamic and static Random Access Memory (RAM).

During power sags, main bus dropouts, or total blackouts on marine and offshore automation switchboards, the CC-SCMB05 immediately safeguards critical runtime control strategy databases, alarm histories, sequence logic parameters, and historical trend buffers. This eliminates cold-start rebuild latencies and avoids system initialization failures during primary bus re-energization.

Model Details

• Model Number / Catalog ID: CC-SCMB05
• Honeywell Manufacturing Part Number (MPN): 51308657-106
• Assembly / Printed Circuit Board (PWB) Reference: 51308658-276
• Hardware Revision: REV: A
• Architecture Class: Series C / PCNT05 Memory Backup Assembly

Technical Specifications

Key Features

1. Zero-Latency Power Transition: Seamlessly injects auxiliary holding voltage into C300 RAM banks during microsecond drops in 24 VDC bus feeds to prevent data corruption.
2. Architecture-Specific Design for C300v5: Engineered to meet the charging circuitry, voltage drop profile, and form factor of C300 revision 5 systems (direct replacement for unsupported legacy implementations.
3. Industrial Marine-Grade Construction: Meets stringent shock, vibration, and thermal dissipation thresholds required for marine engine control rooms (ECR) and offshore production skids.
4. Diagnostic Reporting Bus: Interfaces directly with controller diagnostic routines, reporting cell charging status, reserve holding capability, and battery low-level health alerts prior to critical failure.
5. Drop-in Rev A Compatibility: Built to native mechanical and connector pinout specifications to eliminate rewiring or field software modifications during routine turnarounds.

Compatible Controllers & Backplanes

• Controllers: Honeywell Experion PKS C300 Controller (Series C, C300 Version 5 / C300v5 platforms).
• Carrier Assemblies: Series C C300 IOTA (Input/Output Termination Assembly), PCNT01 / PCNT05 base units.
• Incompatible Units: Not reverse-compatible with older C300 modules configured strictly for the legacy CC-SCMB02 memory module (ensure backplane board index matches before swapping).

Part Number Cross-References

• 51308657-106 (Honeywell Primary Assembly Reference)
• 51308658-276 (Internal Board / Hardware Base PWB Reference)
• CC-SCMB05 (Model / Order Code)
• 51308657-106 REV A (Revision Level Designation)

Applications

• Offshore Oil & Gas Installations: Floating Production Storage and Offloading (FPSO) process safety systems, separator train controls, and subsea tie-in DCS racks.
• Marine Vessel Automation: Dynamic Positioning (DP-2 / DP-3) systems, LNG/LPG cargo management systems (CMS), and automated Main Engine/Auxiliary boiler management systems.
• Refining & Petrochemical Processing: Continuous catalytic cracking units, alkylation plants, and hazardous area flare gas recovery controllers.
• Power Generation Facilities: Combined-cycle gas turbine (CCGT) auxiliary systems, heat recovery steam generators (HRSG), and high-reliability island grid switchyard automation.

Frequently Asked Questions

What is the primary operational function of the Honeywell CC-SCMB05?

The CC-SCMB05 functions as the battery and capacitor memory backup reserve for the Honeywell C300 Controller in an Experion PKS network. It maintains non-volatile RAM storage during utility or UPS power interruptions to prevent parameter loss and eliminate downtime during system reboots.

Can I replace a CC-SCMB02 directly with a CC-SCMB05?

No. The CC-SCMB05 is built specifically for later revision platforms, including the C300 version 5 (C300v5) controller hardware. It uses a modified charging profile and circuit topology that is incompatible with older base assemblies designed strictly for the CC-SCMB02. Always verify your controller version and carrier base part number before purchasing.

How long will the CC-SCMB05 retain memory data during a continuous power blackout?

Under nominal ambient room temperature conditions (approx. 25°C), a fully conditioned and charged CC-SCMB05 can maintain C300 RAM contents for up to 72 hours. Elevated ambient temperatures accelerate discharge rates.

What are the differences between part numbers 51308657-106 and 51308658-276?

Part number 51308657-106 represents the top-level assembly part number for the completed Honeywell CC-SCMB05 module. Part number 51308658-276 designates the internal printed circuit board/sub-assembly substrate. Both markings frequently appear on the same physical unit.

How do I know when the module needs to be replaced?

The C300 Controller continuously runs low-level health monitoring routines over the module bus. When the internal charge storage drops below its threshold, an alarm flag (e.g., Low Memory Battery / Reserve Depletion) is raised in the Experion PKS Station diagnostic view, indicating that the module should be replaced during the next scheduled maintenance window.