PXC22 SIEMENS

PXC22 Siemens Basis unit

Brand：SIEMENS Model number：PXC22

Country of origin: Germany Product weight：0.55kg

HS code：8517623990

Product Details：

Product Dimensions：

The Siemens PXC22 functions as a standalone automation station that can be integrated seamlessly into broader network topologies via native BACnet communication protocols. Designed with a high density of onboard inputs and outputs, it provides a cost-effective control solution for small to medium-sized facilities or dedicated plant applications. The controller hosts a powerful embedded microprocessor that executes time-critical control loops, scheduling, trending, and alarm handling independently of higher-level servers. System integrators configure the device using Siemens engineering software suites, such as Desigo Xworks, enabling tailored control strategies and precise system tuning.

Product Parameters

Operating Voltage: $24 \text{ VAC} \pm 20\%$ at $50/60 \text{ Hz}$
Power Consumption: Approximately $24 \text{ VA}$ depending on external load configurations
Onboard I/O Capacity: 22 integrated input/output points, typically consisting of Universal Inputs (UI), Analog Outputs (AO), and Digital/Relay Outputs (DO)
Communication Protocols: Native BACnet protocol over IP (Ethernet) or LonTalk/PTP depending on the specific variant (e.g., PXC22-E.D or PXC22.D)
Memory Architecture: Flash memory for firmware and application program storage, paired with volatile RAM for real-time operating data
Ambient Operating Temperature: $0\text{°C}$ to $50\text{°C}$ ( $32\text{°F}$ to $122\text{°F}$ )
Ambient Operating Humidity: 10% to 90% relative humidity, non-condensing
Protection Class: IP20 enclosure rating according to EN 60529
Mounting Configuration: Standard $35 \text{ mm}$ DIN rail mounting or direct wall mounting via screw fixings

Product Advantages

A major benefit of the PXC22 is its Native BACnet Compliance, which ensures full interoperability with third-party building management systems and field devices without requiring costly protocol gateways.

The High Onboard I/O Density eliminates the need for separate expansion modules in many standard plant layouts, saving valuable installation space and hardware costs.

Its Autonomous Operation capability means that localized control schedules, trends, and safety interlocks continue running uninterrupted even during network communications outages.

Additionally, seamless integration with the Siemens Desigo CC management platform allows operators to access advanced graphic interfaces, centralized alarm management, and long-term energy reporting tools effortlessly.

Important Considerations and Precautions

When installing and commissioning the PXC22, electrical technicians must ensure that the 24 VAC Power Supply is stable and dedicated, preventing potential ground loops or noise coupling from heavy inductive loads.

Because the housing carries an IP20 Protection Rating, the unit must be housed inside a suitable electrical enclosure or control panel to protect against dust, moisture, and mechanical damage.

Proper Network Configuration is critical during initial setup; duplicate BACnet device IDs or IP addresses on the network will disrupt communication across the entire automation subnet.

Installers must adhere strictly to the maximum Current Load Limits on relay and analog output terminals to prevent thermal damage to the onboard circuitry.

Finally, maintain proper ventilation clearances around the controller chassis within the panel to avoid overheating during continuous high-load operations.

Product Applications

The Siemens PXC22 is deployed across commercial, institutional, and industrial facilities to manage specialized building management tasks.

Air Handling Unit (AHU) Control: Managing supply and return fan speeds, temperature control loops, damper positioning, and filter pressure monitoring.
Heating and Cooling Plants: Regulating boiler staging, heat exchanger loops, chiller sequencing, and primary/secondary pump operations.
Ventilation and Exhaust Systems: Controlling multi-zone variable air volume (VAV) systems, smoke extraction fans, and garage ventilation circuits.
Utility and Environmental Monitoring: Logging energy consumption data from pulse meters and monitoring cleanroom pressure differentials.
Integrated Room Automation: Coordinating lighting, shading, and climate control in commercial office spaces and educational facilities.

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