Siemens QLCCM Series Modules: QLCCM24AAN 16418-41’1

Technical Dossier

Product Details And Specifications

Siemens QLCCM Series: Comprehensive Module Range and Technical Overview

The Siemens QLCCM series represents a family of control modules engineered for building automation and HVAC control applications, deployed extensively across heavy industrial and commercial infrastructure including chemical processing plants, power generation facilities, and large-scale HVAC systems in refineries and institutional buildings. These modules operate within Siemens' broader building technologies ecosystem, interfacing with actuators, sensors, and supervisory control networks. The QLCCM platform has established a significant installed base in facilities requiring long-term operational continuity, making spare parts availability a critical procurement concern for maintenance engineers and facility managers globally.

The Evolution of QLCCM Architecture

The QLCCM series was developed as part of Siemens Building Technologies' modular control strategy, designed to standardize control logic across diverse HVAC and building automation applications. Early variants in the series featured analog control outputs with fixed setpoint logic, targeting single-zone damper and valve actuator control. Subsequent revisions introduced configurable input/output mappings, enabling integration with Siemens' DESIGO and SYNCO supervisory platforms via LON and BACnet communication layers. The 24V AC/DC power supply architecture (reflected in the '24' designation within model numbers such as QLCCM24AAN) became the dominant standard, replacing earlier 230V variants in most new installations due to safety and compatibility requirements. As the series matured, firmware-configurable control sequences replaced hardwired logic, extending compatibility with third-party sensors and actuators. Many QLCCM variants are now in the mature-to-end-of-life phase of their product lifecycle. Siemens has transitioned newer projects toward the DESIGO CC and Synco 700 platforms; however, the QLCCM installed base remains active in facilities with 10–25 year operational horizons, creating sustained demand for original replacement modules.

QLCCM Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the Siemens QLCCM control module series, organized by functional category:

Control Modules — Standard Output

QLCCM24AAN 16418-41'1: 24V AC/DC universal control module, analog output, standard configuration, building automation.

QLCCM24AAN 16418-41'0: 24V AC/DC control module, analog output, base firmware revision, HVAC actuator control.

QLCCM24AAN 16418-41'2: 24V AC/DC control module, analog output, extended setpoint range variant.

QLCCM24AAN 16418-42'1: 24V AC/DC control module, dual analog output, two-zone HVAC control.

QLCCM24AAN 16418-43'1: 24V AC/DC control module, analog output, enhanced EMC shielding variant.

Control Modules — Digital Output

QLCCM24ADN 16418-51'1: 24V AC/DC control module, digital (on/off) output, binary actuator switching.

QLCCM24ADN 16418-51'0: 24V AC/DC control module, digital output, base revision, relay-driven actuator control.

QLCCM24ADN 16418-52'1: 24V AC/DC control module, dual digital output, two-channel switching control.

Control Modules — Floating/Three-Point Output

QLCCM24AFN 16418-61'1: 24V AC/DC control module, floating (three-point) output, motorized valve/damper control.

QLCCM24AFN 16418-61'0: 24V AC/DC control module, floating output, base revision, rotary actuator applications.

QLCCM24AFN 16418-62'1: 24V AC/DC control module, floating output, extended travel time configuration.

Control Modules — High-Voltage Variants

QLCCM230AAN 16418-41'1: 230V AC control module, analog output, legacy high-voltage installation compatibility.

QLCCM230ADN 16418-51'1: 230V AC control module, digital output, legacy relay switching applications.

QLCCM230AFN 16418-61'1: 230V AC control module, floating output, legacy motorized actuator control.

Accessory / Communication Modules

QLCCM-ADP01: Mounting adapter plate for QLCCM series, DIN rail and panel surface installation.

QLCCM-BUS01: LON/BACnet communication interface module for QLCCM series supervisory integration.

Sourcing Hard-to-Find & Obsolete QLCCM Parts

Quality Control for the QLCCM Range

Each QLCCM module processed by DriveKNMS undergoes a structured inspection and functional verification protocol adapted to the specific electrical and communication architecture of the series. Visual inspection covers PCB condition, terminal block integrity, relay contact wear, and conformal coating status. Electrical testing verifies input voltage tolerance across the rated 24V AC/DC or 230V AC supply range, output signal accuracy (analog: 0–10V DC or 4–20mA; digital: relay continuity and switching time; floating: directional output sequencing and travel time). Where applicable, communication interface modules are tested for LON transceiver function and BACnet/IP packet integrity using protocol analyzers. Firmware revision is confirmed against Siemens documentation to ensure compatibility with the target supervisory system version. Modules exhibiting parameter drift, relay contact degradation, or communication faults are quarantined and not released for sale. Test records are retained per unit and available upon request for critical infrastructure procurement.