SIEMENS PXA40-RS1 Controller Module

Siemens PXA40-RS1 Controller Module

The Siemens PXA40-RS1 is an option / communication expansion module used in Siemens Desigo PX building automation controllers (PXC001 series). It is designed to extend system controllers with additional communication capabilities for integrating field buses and third-party systems such as Modbus, M-Bus, and SCL networks.

It is not a standalone PLC module, but a hot-swappable expansion module for building automation stations.

Key Specifications

• Model: PXA40-RS1
• Siemens Order No.: S55372-C115
• Product Type: Option / Communication Module
• System: Siemens Desigo PX (PXC001 / PXC001-E.D controllers)
• Communication Support:
  • Modbus RTU / Modbus TCP
  • M-Bus
  • SCL integration
• Data Capacity:
  • Up to ~800 data points (typical configuration)
  • Higher capacity depending on protocol mapping
• Installation: Plug-in module (DIN rail controller system)
• Hot-pluggable: Yes (can be inserted during operation)
• Function: Expands controller communication interfaces

Features & Advantages

• Enables multi-protocol integration (Modbus / M-Bus / SCL)
• Expands controller capability up to large data point systems
• Hot-swappable design reduces downtime
• Seamless integration with Desigo PX automation stations
• Supports third-party device connectivity in BMS systems
• Stable long-term operation in building automation environments
• Easy upgrade without replacing main controller

Applications

• HVAC building automation systems (BMS / BAS)
• Commercial buildings (hotels, hospitals, offices)
• Energy monitoring systems
• Integration of meters (electricity, water, heat via M-Bus)
• Industrial building infrastructure control
• Smart building management platforms
• Multi-system communication gateway setups