Siemens QLCCM24AAN Retrofit-Ready BACnet CCM for APOGEE

Siemens QLCCM24AAN Retrofit-Ready BACnet CCM for APOGEE Desigo Control Systems

The Siemens QLCCM24AAN (16418-41’1) is a BACnet Communicating Control Module (CCM) engineered for seamless integration into APOGEE Desigo building automation and control networks. As legacy APOGEE field panels and terminal equipment controllers reach end-of-life, the QLCCM24AAN serves as the authoritative retrofit solution — preserving existing wiring infrastructure, BACnet MS/TP communication topology, and field-level control logic without requiring a full system overhaul.

Operating on a 24 V AC/DC supply, the QLCCM24AAN is dimensionally and electrically compatible with earlier-generation CCM variants deployed across APOGEE MEC, FLN, and P2 bus architectures. For facilities engineers managing aging control cabinets, this module eliminates the need to re-engineer terminal block layouts or reprogram upstream PXC Modular controllers, significantly compressing retrofit project timelines and reducing commissioning risk.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful QLCCM24AAN retrofit begins well before the module arrives on site. Engineers should audit the existing APOGEE field panel to confirm the 24 V Class 2 transformer has sufficient VA capacity to support the replacement CCM alongside co-installed I/O modules such as the Siemens TEC (Terminal Equipment Controller) or any co-located PTEC modules sharing the same power rail. Where transformer headroom is marginal, a Siemens SPYDER or equivalent 40 VA Class 2 power supply should be staged as a parallel upgrade.

Terminal block wiring on the QLCCM24AAN follows the standard APOGEE CCM pinout. Technicians should photograph and label all existing field wiring — particularly the BACnet MS/TP EIA-485 bus connections (TB1 terminals) and the 24 V supply leads — before removing the legacy module. The replacement module slots directly into the same DIN rail position, and the existing Belden 9841 or equivalent shielded twisted-pair MS/TP trunk cable can be reused without re-termination, provided the shield drain is properly landed at one end only.

For sites running APOGEE Insight as the supervisory platform, the module address must be confirmed against the existing network map before powering up. The QLCCM24AAN uses onboard DIP switches to set the MS/TP MAC address; mismatched addresses will cause the PXC Compact or PXC Modular controller upstream to fail device discovery. Once the address is confirmed, the application program — typically stored in the APOGEE Insight database or a TALON CT engineering laptop — should be re-downloaded to the module to restore all control sequences, setpoints, and schedule objects.

Sites that have migrated portions of their network to Desigo CC will find the QLCCM24AAN fully compatible with the BACnet router functionality embedded in PXC36-E.D or PXC100-E.D field panels, allowing the retrofitted CCM to coexist on a mixed MS/TP and BACnet/IP backbone without gateway hardware. HMI graphics in Desigo CC or legacy APOGEE Insight operator workstations do not require redrawing, as the BACnet object model — including Analog Input, Analog Output, Binary Input, Binary Output, and Multi-State Value objects — is preserved across the replacement.

Where the retrofit scope extends beyond a single CCM, project planners should account for associated components: Siemens APOGEE MEC backplane assemblies, QAX910 room sensors feeding analog inputs, QMX3 zone damper actuators on binary outputs, and any co-installed Siemens RXB or RXC room controllers sharing the same FLN segment. Staging these components together with the QLCCM24AAN reduces the number of planned outage windows and allows a single commissioning visit to validate the entire upgraded segment.

Downtime Control During System Migration

Minimizing control system downtime during a CCM swap requires a structured hot-swap protocol. Before de-energizing the field panel, the site engineer should capture a full point-by-point status snapshot from the APOGEE Insight trend log or Desigo CC live data view, documenting all analog input values, output command states, and active alarms. This baseline allows rapid verification that the replacement QLCCM24AAN has resumed correct operation after commissioning.

The physical swap — removing the legacy CCM, seating the QLCCM24AAN, and re-terminating field wiring — typically takes under 30 minutes for an experienced technician. Power restoration and BACnet device discovery add another 5–10 minutes. Application download from TALON CT or APOGEE Insight completes within minutes for standard VAV or FCU applications. Total planned outage for a single CCM replacement is therefore achievable within a one-hour maintenance window, well within the tolerance of most HVAC and building automation service agreements.

To protect original program logic, engineers should maintain a current backup of the CCM application in the APOGEE Insight database or as an exported TALON CT project file before beginning any field work. If the legacy module has failed and the application cannot be retrieved from the module itself, the backup file serves as the sole recovery path. SMARTNEXMSK ships each QLCCM24AAN with a pre-shipment functional test report, confirming communication, I/O channel integrity, and firmware version — reducing the risk of commissioning delays caused by infant-failure hardware.

Retrofit Support FAQ

Q1: Is the QLCCM24AAN a direct drop-in replacement for all APOGEE CCM variants?
The QLCCM24AAN is dimensionally and electrically compatible with the majority of APOGEE MEC-series CCM modules operating on 24 V AC/DC and BACnet MS/TP. Customers should confirm the existing module’s supply voltage, MS/TP baud rate setting, and application type (VAV, FCU, or custom) before ordering. Our technical team can cross-reference your existing part number against the QLCCM24AAN specification sheet upon request.

Q2: What commissioning steps are required after installation?
After seating the QLCCM24AAN and restoring power, verify the MS/TP MAC address via DIP switches, confirm BACnet device discovery from the upstream PXC controller or APOGEE Insight workstation, and re-download the application program. Perform a full I/O point check against the pre-swap baseline to confirm all field devices — sensors, actuators, and damper controllers — are responding correctly before returning the system to automatic mode.

Q3: Can the QLCCM24AAN coexist with Desigo CC and legacy APOGEE Insight on the same network?
Yes. The QLCCM24AAN communicates via standard BACnet MS/TP and is fully discoverable by both APOGEE Insight and Desigo CC supervisory platforms. No gateway or protocol converter is required when the module is connected to a field panel with integrated BACnet routing capability, such as the PXC36-E.D or PXC100-E.D.

Q4: What does the 12-month warranty cover, and what pre-shipment testing is performed?
Every QLCCM24AAN unit undergoes functional testing prior to shipment, including power-up verification, BACnet MS/TP communication check, and I/O channel continuity test. The 12-month warranty covers manufacturing defects and functional failures under normal operating conditions. Units are shipped with a test report. Expedited replacement is available for warranty claims to minimize site downtime.

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