PXC36-E.A SIEMENS

PXC36-E.A Siemens Basis unit

Brand：SIEMENS Model number：PXC36-E.A

Country of origin: Germany Product weight：0.55kg

HS code：8517623990

Product Details：

Product Dimensions：

The Siemens PXC36-E.A is a programmable automation station belonging to the Desigo PX family of building automation and control systems. Designed specifically for HVAC and building services applications, this high-performance controller manages complex heating, ventilation, air conditioning, and primary plant operations. It serves as a central intelligence unit that executes pre-programmed control strategies, processes sensor inputs, and commands field actuators while maintaining seamless integration with higher-level building management systems.

Equipped with native BACnet on Ethernet (BACnet/IP) communication capabilities, the PXC36-E.A provides real-time data exchange across the facility network. The device features integrated input and output points on the main board, allowing direct connection to field devices without requiring external expansion modules for standard-sized installations.

Product Parameters

Operating Voltage: 24 VAC ( $\pm20\%$ ) at 50/60 Hz
Communication Protocol: Native BACnet/IP over Ethernet (10/100 Base-T)
Total Onboard I/O Points: 36 universal and configurable input/output points
Universal Inputs/Outputs: Configurable for passive temperature sensors (such as LG-Ni1000, Pt1000, NTC), active voltage inputs ( $0-10 \text{ VDC}$ ), current inputs ( $4-20 \text{ mA}$ ), binary contacts, or analog outputs ( $0-10 \text{ VDC}$ )
Digital Relay Outputs: Monostable or bistable relay outputs for direct switching of pumps, fans, and binary actuators
Processor Architecture: High-performance 32-bit microprocessor
Memory: Onboard Flash and RAM memory for operating system, application programs, and historical trend buffers
Battery Backup: Integrated lithium battery for real-time clock retention and data preservation during power outages
Operating Temperature Range: 0°C to 50°C
Operating Humidity Range: 5% to 95% relative humidity (non-condensing)
Enclosure Protection Rating: IP20 according to EN 60529 (suitable for control cabinet mounting)

Product Advantages

Integrated High-Density I/O: With 36 onboard channels, the controller reduces cabinet space requirements and installation labor by consolidating many connection points into a single device.
Seamless BACnet/IP Integration: Native Ethernet communication enables rapid data transmission, effortless networking across building IT infrastructures, and direct connection to Desigo CC or third-party BACnet management workstations.
Flexible Channel Configuration: The universal I/O design allows engineers to reconfigure input and output types via software, reducing spare parts inventory and simplifying field engineering.
Autonomous Operating Capability: In the event of a network disconnection, the unit continues executing its local control logic, maintaining environment stability and saving trend data locally.
Freely Programmable Logic: Utilizing Siemens Xworks engineering tools, complex customized control strategies, scheduling programs, and energy-saving algorithms can be loaded directly onto the station.

Important Considerations and Precautions

Supply Voltage Quality: Ensure the 24 VAC supply is derived from a safety isolating transformer and remains within the specified voltage tolerances to avoid logic resets or hardware degradation.
Protection Class Constraints: Due to its IP20 enclosure rating, the unit must be installed inside a protective electrical control panel or enclosure that shields it from dust, moisture, and conductive contaminants.
Grounding and Shielding: Proper grounding procedures must be followed for Ethernet communications and low-voltage signal lines to prevent ground loops and electromagnetic interference from disturbing sensitive analog readings.
Power Disconnection Safety: Always de-energize the main control cabinet power before connecting field cables, replacing fuses, or inserting option cards to prevent electrical shock or component damage.
Battery Maintenance: The internal backup battery should be inspected and replaced periodically according to preventative maintenance schedules to ensure clock retention during unexpected power losses.

Product Applications

Primary Heating and Cooling Plants: Controlling boiler sequences, chiller staging, primary/secondary pump loops, and heat exchangers.
Air Handling Unit (AHU) Management: Executing multi-stage temperature control, humidity control, static pressure regulation, and economizer damper modulation.
District Energy Stations: Monitoring energy consumption, controlling valve actuators, and interfacing with BTU meters in sub-stations.
Critical Facilities Environment Control: Maintaining precise temperature and humidity conditions in pharmaceutical storage, cleanrooms, and data center auxiliary cooling systems.
Complex Commercial Buildings: Serving as a localized system controller within office towers, educational institutions, hospitals, and transportation hubs.

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