Siemens PXC36.1.D Desigo PX Compact Automation Station

Description

Siemens PXC36.1.D Desigo PX Compact Automation Station

Product Overview

The Siemens PXC36.1.D (Stock No. S55372-C120) is a high-performance, compact direct digital control (DDC) automation station belonging to the Desigo PX system family.

Designed for HVAC and building services automation, the PXC36.1.D features a fixed physical layout of 36 integrated I/O data points. The “.1” designation indicates that it includes an Island Bus interface, allowing local I/O expansion using TX-I/O modules or TX Open integrations. It operates using native BACnet on LonTalk network protocols for peer-to-peer and supervisory communication.

Technical Specifications

Key Advantages

• High Density in Compact Footprint: Houses 36 software-configurable data points directly on the board, minimizing panel space requirements for medium-to-large plant controllers.
• Modular Extendibility: The built-in Island Bus plug enables fast extension via TX-I/O modules (such as TXM1.8U, TXM1.6R) without replacing the main controller.
• Native BACnet Protocol: Ensures open, standardized interoperability over LonTalk field buses across building management platforms.
• Autonomous Intelligence: Executes complex control loops, time schedules, alarm handling, and historical trend logging independently without requiring a constant server connection.
• Flexible Universal Terminals: Software-definable Universal I/O points (UIO) accommodate temperature sensors, 0–10 V signals, status contacts, or analog outputs dynamically.
• PPS2 Room Unit Support: Allows direct point-to-point connection of user-friendly Siemens QAX room control units.

Important Installation & Usage Precautions

• Enclosure Protection: Rated IP20; must be installed inside a clean, dry, lockable control cabinet or enclosure to protect against dust and moisture.
• Power Supply Quality: Operates strictly on AC 24 V (SELV / PELV). Ensure transformer sizing accommodates the 35 VA internal load plus connected active sensor supplies.
• Relay Output Limits: Relay outputs are rated up to 2 A at 230 V AC. Heavy inductive loads (e.g., large motor starters or solenoids) require interposing relays or contactors.
• Island Bus Grounding: When extending with TX-I/O modules via the Island Bus, the system neutral (⊥\bot⊥) terminal must be properly referenced across all expansion blocks.
• Battery Maintenance: Periodically check the internal RAM backup battery (AA type) to prevent program memory loss during extended power outages.
• LonTalk Termination: Ensure the LonTalk fieldbus topology is correctly terminated at both ends with appropriate bus terminators to maintain reliable BACnet communication.

Applications

• Air Handling Units (AHUs): Multi-stage heating/cooling coil control, fan speed regulation (VFD), damper positioning, and filter monitoring.
• Central Heating & Cooling Plants: Sequencing multiple boilers, chillers, primary/secondary pumps, and heat exchangers.
• VAV & District Energy Management: Managing variable air volume systems and thermal energy distribution loops.
• Industrial & Commercial Facilities: Installed in office buildings, hospitals, schools, and shopping centers requiring distributed BACnet building automation.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

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