SIEMENS PXA40-T

PXA40-T SIEMENS Basis unit

Product  Description：

The PXA40-T serves as a Modem Extension Card. It is a plug-in accessory that expands the capabilities of Siemens modular controllers, such as the PXC00..D, PXC50..D, and PXC100 series. Its primary role is to provide a dedicated interface for remote management via a modem, allowing building managers to monitor and control automation stations from off-site locations. This module is part of the legacy Desigo PX range and is known for its high reliability in established building management systems (BMS).

Product Parameters

• Product Number: PXA40-T

• Part Number: BPZ:PXA40-T

• Communication Interface: Modem / PTP (Point-to-Point)

• Mounting: Plug-in module for modular automation stations

• Net Weight: Approximately $0.053 \text{ kg}$

• Degree of Protection: IP20 (Suitable for installation in dry, protected environments such as control cabinets)

• Compatibility: Compatible with modular PXC series controllers (non-E versions typically use PTP/Modem interfaces)

• Operating Voltage: Powered directly via the host automation station backplane

• Status: This product is classified as discontinued/legacy, with modern replacements often moving toward IP-based web modules like the PXA40-W1 or PXA40-W2

Product Advantages

• Remote Accessibility: Enables secure remote access to building automation systems, which is critical for maintenance and emergency troubleshooting without being physically on-site.

• Ease of Installation: The module is designed for "plug and play" integration. It can be inserted directly into the designated slot on the PXC modular controller without complex external wiring.

• Robust Communication: Provides a stable point-to-point connection that does not rely on local IT networks, which can be advantageous in facilities with restricted network policies.

• Seamless Integration: Being an official Siemens Desigo PX component, it ensures full software compatibility with Desigo Insight and Desigo CC management platforms.

Important Considerations

• Legacy Status: As the PXA40-T is a discontinued item, availability is generally limited to spare parts or refurbished stock. For new projects, Siemens recommends migrating to modern BACnet/IP or Web-based communication modules.

• Environmental Limits: Ensure the control cabinet maintains an IP20-compliant environment. The module should be protected from excessive humidity, dust, and conductive contaminants.

• Power Safety: Although the module is small, it should only be inserted or removed when the automation station is powered down to prevent potential communication bus errors or electronic damage.

• Modem Requirements: Use only Siemens-approved or industry-standard modems that are compatible with the PTP protocol to ensure reliable data transmission.

Product Applications

The PXA40-T is primarily utilized in large-scale building automation and HVAC control systems.

• Remote Site Monitoring: Used in geographically distributed buildings where a permanent internet connection is unavailable or not desired.

• Service and Maintenance: Provides a "backdoor" for service engineers to dial into the system for software updates or diagnostic checks.

• Alarm Notification: Can be configured to send system alerts or status reports via the modem link to a central management station.

• Legacy System Support: Essential for maintaining older Desigo PX installations that rely on serial or modem-based PTP communication rather than modern Ethernet/IP infrastructures.

The structure and details of the product：

Our services：

Shipping Port:  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

Warranty: one year

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