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- SIEMENS PXC100.D Controller Module
  
  Overview
  
  The PXC100.D is a freely programmable modular DDC (Direct Digital Control) automation station under Siemens Desigo / APOGEE building automation system, dedicated to HVAC, lighting and general building service control. It acts as a standalone field controller or networked system controller, supporting flexible TX-I/O module expansion and multi-building communication protocols. It integrates a backup lithium battery to retain real-time clock and volatile data during power outages.
  
  Key Specifications
  
  Processor: PowerPC MPC885 @ 133 MHz
  
  Memory: 64 MB SDRAM + 16 MB Flash ROM
  
  Power Supply: AC 24 V ±20%, 50/60 Hz; max power consumption 24 VA
  
  Mounting: Standard DIN rail
  
  Dimensions: 192 mm × 90 mm × 70 mm
  
  Operating temperature: 0 °C ~ +60 °C (cabinet indoor use)
  
  Built-in backup battery: Lithium cell for RTC (10-year service life); alkaline backup for RAM data
  
  I/O Expansion: Supports TX-I/O island bus, up to 52 physical I/O points; max 200 total data points including virtual tags
  
  Communication Interfaces
  
  RJ45 Ethernet 10/100 Mbps: APOGEE P2, BACnet/IP
  
  LON FTT RS485 bus: BACnet / LonTalk
  
  USB & RS232 local port: On-site programming, connect PXM touch panels
  
  Expandable via PXA40 communication modules: Modbus RTU, M-Bus, KNX
  
  Main Functions
  
  Independent HVAC closed-loop control
  
  Built-in self-adaptive MFA PID algorithm for chillers, air handling units, heat pumps, fan coil units; supports temperature, humidity, pressure and flow regulation.
  
  Flexible modular I/O management
  
  Connect universal TX-I/O modules for digital inputs/outputs, analog signals (0–10 V, 4–20 mA), RTD and thermocouple temperature sensors; all channels software configurable without hardware rewiring.
  
  Multi-protocol system integration
  
  Interconnect with room controllers (RXC/RXB), third-party chillers, lighting systems and power meters via BACnet, LonTalk, Modbus and M-Bus.
  
  Full building management functions
  
  Time scheduling for equipment auto switch
  
  Real-time & historical trend data logging
  
  Multi-level alarm classification & remote notification
  
  User access authority management
  
  Web server for remote browser monitoring
  
  Data retention without mains power
  
  Lithium battery sustains real-time clock for 10 years; alkaline battery preserves program variables and alarms for up to 1 month after power loss.
  
  Network topology support
  
  Work as ALN automation level controller, build peer-to-peer network with other PXC stations; compatible with MRP ring network for communication redundancy.
  
  Advantages
  
  Modular expandable design matches small-to-medium building projects, convenient for later capacity upgrade
  
  Dual network architecture (Ethernet + LON) delivers stable cross-layer building communication
  
  Built-in battery backup avoids data loss during power cuts
  
  All-in-one control platform unifies HVAC, lighting and energy monitoring
  
  Wide third-party device compatibility reduces system integration costs
  
  DIN rail compact layout saves control cabinet space
  
  Non-volatile flash memory supports on-site firmware upgrade without extra hardware