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

Description

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.

Operating Principle

The CCM+ acts as the central processing module in a QUADLOG or APACS+ rack, running the control logic that reads inputs from I/O modules over the rack’s IOBUS, executes the configured control strategy, and writes outputs back to the field. Its redundant interprocessor communication bus lets a second CCM+ mirror the active module’s state in real time, so a failure on the primary module hands control to the standby unit without interrupting the process — the core mechanism behind its TUV-rated safety-critical certification.

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.

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About brand
Siemens is a global leader in industrial automation, power distribution, and process control. Their portfolio spans PLCs (SIMATIC series), distributed I/O, drives, HMIs, industrial Ethernet, and legacy APACS/QUADLOG modules—trusted across factories, utilities, oil & gas, and critical infrastructure. Siemens solutions deliver reliable performance, easy integration with modern SCADA and DCS systems, and long-term support for legacy installations. Seven Star LLC supplies genuine Siemens components, validates compatibility for replacements or upgrades, and provides documentation to ensure smooth commissioning and compliance.

Click to view complete Siemens information.

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Siemens APACS QUADLOG QLCCM24AAN CCM Module ROM 3.03
Siemens APACS QUADLOG QLCCM24AAN CCM Module ROM 3.03
Siemens APACS QUADLOG QLCCM24AAN CCM Module ROM 3.03
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Siemens APACS QUADLOG QLCCM24AAN CCM Module ROM 3.03
Siemens APACS QUADLOG QLCCM24AAN CCM Module ROM 3.03
Siemens APACS QUADLOG QLCCM24AAN CCM Module ROM 3.03
Request for quotation (RFQ)

Frequently Asked Questions

What is the QLCCM24AAN module and which control systems is it compatible with?
The QLCCM24AAN is a Critical Control Module Plus (CCM+) made by Siemens (Moore) for the legacy APACS+ and QUADLOG process control platforms, and is also cross-referenced under part numbers 16418-41/4, 16418-41/3, and 16418-41/1.
What processor and memory does the QLCCM24AAN use?
It is built around a Motorola 68030 CPU paired with a 68302 I/O coprocessor and dual 256-byte cache, with redundant battery-backed RAM available in 2 MB or 4 MB configurations.
What are the power draw and environmental ratings of the QLCCM24AAN?
The module runs on 24 VDC from the MODULRAC/SIXRAC backplane, drawing about 0.52 A typical (0.60 A max, roughly 12.5 W), and is rated for -25°C to 70°C operation (storage to 85°C) while withstanding 2 g vibration and 15 g mechanical shock.
Does the QLCCM24AAN support hot-swap replacement and safety-critical duty?
Yes — it can be hot-swapped without shutting down the rack, includes a redundant interprocessor communication bus for module- and rack-level redundancy, and is built for TUV safety-critical applications covering AK levels 1-6 with FMEA-enhanced diagnostics.
Is the QLCCM24AAN still manufactured, and what should buyers expect on availability?
No — the QLCCM24AAN has been discontinued by Siemens, so it is sourced today as surplus or refurbished inventory through specialized industrial parts suppliers; buyers should confirm the specific unit's test status and warranty terms before purchase, since original OEM warranty coverage no longer applies.