Siemens PXC22 Building Automation Controller

Description

Siemens PXC22 Building Automation Controller

Product Dimensions：

The Siemens PXC22 (e.g., PXC22.E.D or PXC22.D) is a compact, freely programmable automation controller from the Siemens Desigo PX family. It is engineered for direct digital control (DDC) of primary plant systems, HVAC equipment, and building services in small to medium-sized facilities.

Product Detailed Description

The PXC22 series combines onboard physical inputs and outputs with native network communication and standalone control logic. It functions as an intelligent controller that executes programmed schedules, control loops, and alarm routines. Depending on the specific variant suffix:

• PXC22.E…: Features BACnet/IP Ethernet communication.
• PXC22…: Features BACnet/LonTalk or MS/TP fieldbus communication.
• …D: Includes an integrated Local User Interface (LUI) with an LCD screen and navigation keys on the front cover.

Technical Parameters

Product Advantages

• Optimized Onboard Density: Offers 22 fixed I/O channels directly on the unit, providing a cost-effective, self-contained solution for standalone equipment (like small AHUs or boiler/chiller loops) without mandatory expansion cards.
• BACnet Certified B-BC: Acts as a certified BACnet Building Controller, facilitating seamless, open integration into third-party BMS workstations and Desigo CC.
• Standalone Autonomy: Executes complex control strategies, trend logging, and time schedules locally; control remains fully active even during network communication outages.
• Local Override & Monitoring (.D variants): Models with the integrated LUI allow facility engineers to read live sensor data, adjust setpoints, and manually override output relays directly at the control cabinet.
• Proven Energy Efficiency Functions: Pre-tested control macro libraries in Siemens Desigo Xworks reduce engineering time and optimize energy usage.

Important Considerations (Precautions)

• Power Supply Requirements: Always power the controller using a dedicated 24 V AC safety extra-low voltage (SELV / PELV) transformer. Do not mix power lines with heavy inductive loads (like large contactors) to prevent voltage spikes.
• Terminal Current Limits: Ensure connected relay loads stay within the rated maximum switching currents (typically max. 2 A / 250 V AC for digital outputs). Use interposing relays for heavy electrical loads.
• Battery Maintenance: Periodically check and replace the internal lithium battery backing up the real-time clock to avoid time/date resets after extended mains power outages.
• Network Security: When using BACnet/IP variants (PXC22.E), keep the network isolated behind a secure corporate firewall or VPN—never expose BACnet devices directly to the public internet.

Product Applications

The PXC22 is ideal for direct equipment control across commercial and industrial facilities:

• Air Handling Units (AHUs): Precise regulation of supply/return fan speeds, heating/cooling valves, and damper positions.
• Boiler & Chiller Plant Sub-loops: Secondary pump sequence control, mixing valve regulation, and heat exchanger temperature management.
• Compact Building Utilities: Exhaust fan management, pump station control, and energy metering data collection.
• District Energy Substations: Managing heat exchanger pressure and temperature setpoints in district heating nodes.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

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