QLCCM24AAN – Siemens APACS / QUADLOG CCM Module (ROM Version 3.03)

QLCCM24AAN – Siemens (Moore) APACS+ / QUADLOG Critical Control Module Plus (CCM+) – ROM Version 3.03

The QLCCM24AAN is a robust Critical Control Module Plus (CCM+), developed by Siemens (Moore) for legacy APACS+ and QUADLOG control systems. This intelligent module delivers advanced control capabilities with enhanced performance, safety, and diagnostic features—essential for industrial applications demanding high availability and precision. Despite being discontinued, it remains a critical replacement component for maintaining and refurbishing aging automation infrastructures.

Key Specifications

• Part Number: QLCCM24AAN, also referenced as 16418-41/4 or 16418-41/3, and sometimes simply listed as 16418-41/1   .

• Module Type: CCM+ (Critical Control Module Plus), part of the QUADLOG architecture; also compatible with APACS+  .

• Supply Voltage: 24 VDC from MODULRAC/SIXRAC backplane  .

• Current Consumption: Typically around 0.52 A, maximum up to 0.60 A  .

• Power Dissipation: Approximately 12.5 W  .

• Processor: Motorola 68030 CPU, paired with dual 256-byte cache and 68302 I/O coprocessor. RAM configurations include redundant battery-backed options (2 MB or 4 MB)  .

• Battery Life: Expected peripheral retention battery life is 10 years in powered state; storage battery varies from 10 years (23 °C) to 8.5 years (85 °C)  .

• Environmental Ratings: Operates between –25 °C to 70 °C; storage up to –25 °C to 85 °C. Designed to withstand 2 g vibration, 15 g mechanical shock, and complies with IEC and ANSI/ISA standards for emissions and immunity  .

• Weight: Approximately 1.8–2.0 kg (around 4.5 lbs)  .

Performance & Safety Features

• Delivers 30–40% faster scan performance compared to legacy CCM models  .

• Includes redundant interprocessor communication bus for module-to-module and rack-to-rack redundancy—critical in high-availability systems  .

• Built for TÜV safety-critical applications, covering AK levels 1–6  .

• Offers FMEA-enhanced diagnostics with fault-injection testing for integrity validation  .

• Supports Hot-Swap capability, allowing replacement without shutting down the system  .

Applications & Use Cases

Ideal for:

• Refurbishing or maintaining legacy APACS+ and QUADLOG control racks.

• Extending uptime and reliability for critical operations in oil & gas, power generation, petrochemical, and water/wastewater treatment industries.

• Serving as OEM-equivalent replacements when maintaining aging automation systems without full platform upgrades.

Product Availability & Condition

• Discontinued by Siemens, but still available through surplus and refurbished inventory from specialized suppliers such as Radwell and 4D Controls   .

• Radwell offers a 2-year warranty on refurbished units; though OEM warranty no longer applies  .

• 4D Controls also stocks used units with QA-tested condition and warranty support  .

• Trident Automation lists pre-owned units (typically with no warranty)  .

Why This Module Matters

• Maintains compatibility with existing APACS+/QUADLOG systems, avoiding costly system replacement.

• Enhances performance and reliability in legacy installations.

• Provides a pragmatic solution for systems where OEM support has ended.

• Supports hot-swap and diagnostic capabilities—minimizing downtime.

Technical Specifications

Identifying a Compatible QUADLOG CCM+ Replacement

Because QUADLOG and APACS+ systems have been in service for many years, sites often hold modules of several hardware and firmware revisions. Before ordering a replacement CCM+, collect the following from the installed module and the system records:

• The full model code QLCCM24AAN and the assembly number on the module label (for example the 16418-41 family with its revision suffix).
• The ROM or firmware version currently running, since this listing covers ROM version 3.03 and mixing versions in a redundant pair must be checked against the system configuration.
• The installed memory option and whether the module operates as part of a redundant pair.
• The rack type and the version of the engineering software used to maintain the configuration.

Sharing photos of the module labels lets us match the replacement to your installed base before it is shipped.

Replacement and Commissioning in a Redundant System

In a redundant configuration the healthy module keeps the process running while the failed unit is exchanged, but the procedure must still be planned carefully in a safety system:

• Work under the site’s management of change and permit procedures, with operations informed of the reduced redundancy.
• Confirm which module is primary and which is standby from the system diagnostics before removing anything.
• Check the backup battery status and module settings on the replacement before insertion.
• After insertion, confirm that the new module synchronizes with its partner and that no diagnostic alarms remain, then record the change in the system maintenance log.

Maintenance and Obsolescence Planning

Memory backup batteries, dust in the racks and cabinet temperature are the main factors that affect long-term reliability of legacy controllers. Periodic review of system diagnostics, cabinet cooling checks and planned battery replacement reduce unexpected failures. Because the platform is discontinued, many operators also hold tested spare CCM+ modules on site and keep a documented configuration backup, which buys time while a longer-term migration strategy is prepared.

Installed Base in Oman and the GCC

QUADLOG safety and APACS+ control systems were installed on gas processing plants, refineries, petrochemical units and power and water facilities across the region, and many of these systems remain in service. Keeping critical modules available is essential for plants that need to maintain their safety functions until a planned upgrade.

Sourcing Through Seven Star LLC

Seven Star LLC sources QUADLOG and APACS+ modules for legacy system support, with the condition of each unit (new surplus, used or refurbished) and its revision details stated clearly in the quotation. Send the part number, revision and quantity through our quote request.

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