Siemens PXC24.2-EF32.A Building Automation Controller
The Siemens PXC24.2-EF32.A is a programmable building automation controller from the Desigo PXC series. It is designed for HVAC (heating, ventilation, air conditioning) and lighting control in commercial buildings. The controller features an FLN (Floor Level Network) port for connecting to TX‑I/O modules, and it supports BACnet/IP communication for integration into a building management system (BMS). The unit operates on 24V AC and is suitable for stand‑alone or networked applications.
Processor and Memory
32‑bit ARM Cortex processor at 200 MHz. Program memory: 32 MB flash, data memory: 64 MB RAM. Real‑time clock with 7‑day backup capacitor. The controller stores up to 10,000 analog data points and 5,000 alarm entries.
I/O and Expansion
The PXC24.2-EF32.A has 24 universal I/O points onboard, configurable as digital input, digital output (triac or relay), analog input (0–10V, 4–20mA, PT1000), or analog output (0–10V). It also includes a built‑in Ethernet port for BACnet/IP, an FLN port (RS‑485) for up to 32 TX‑I/O modules (e.g., TXM‑1.8U, TXM‑1.16D), and a service port for commissioning.
Communication
Ethernet (RJ45): BACnet/IP, HTTP web server, Modbus TCP.
FLN (RS‑485): Siemens proprietary protocol (9600 bps).
Service port (mini‑USB): for connection to PC with Desigo CC.
Programming and Software
Programming is done with Siemens Desigo CC (version 4.2 or higher) or PPCL (Point Programmable Control Language). The controller supports time‑of‑day scheduling, trend logging, PID loops, and alarm management. The built‑in web server allows remote monitoring and parameter adjustment via standard browser.
Power and Environment
Supply voltage: 24V AC (22–26V), 50/60 Hz. Power consumption: 15 VA. Dimensions: 180 mm width x 130 mm height x 50 mm depth. Weight: 0.6 kg. Mounting: DIN rail (EN 60715) or panel. Operating temperature: -20°C to +55°C; storage: -40°C to +85°C. Humidity: 10% to 90% non-condensing. Protection class: IP20. Certifications: CE, UL 916, and RoHS.
Diagnostics and LEDs
LEDs: PWR (green), RUN (green), ERR (red), COM (yellow for Ethernet), and FLN (green). A 2‑line LCD display shows IP address and error codes. The controller logs up to 500 system events.
Typical Applications
Air handling units (AHU), fan coil units, boiler controls, lighting automation, and room pressure control in hospitals or cleanrooms.
Ordering and Documentation
Siemens order number: PXC24.2-EF32.A. Includes terminal blocks and a quick start guide. Manual: Desigo PXC Hardware Reference (A6V10327622).
Beckhoff CP6533-0001 0050
Beckhoff CPU Module CX5140-0155/4GB CPU Module
