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.