Siemens 6BK1621-0AA00-0AA0 – PROFINET to BACnet Gateway for Industrial and Building Automation
What is Siemens 6BK1621-0AA00-0AA0?
The Siemens 6BK1621-0AA00-0AA0 is a robust PN/BACnet LINK gateway designed to seamlessly connect PROFINET networks to BACnet/IP-based devices. This device is part of the SIMATIC NET family and plays a critical role in industrial automation and building management systems (BMS), where interoperability between communication protocols is essential.
Key Technical Features:
- Protocols: PROFINET IO ↔ BACnet/IP (Profile B-GW)
- Network ports:
- BACnet capacity: Up to 1000 objects / 126 PROFINET devices
- Power Supply: 24 V DC (20.4 – 28.8 V)
- Mounting: DIN rail or panel, vertical/horizontal
- Certifications: CE, UL, ISO 16484-5
- Firmware updates supported, managed via TIA Portal (v14 SP1 or later)
- Built-in web server for diagnostics and configuration
Availability & Pricing – Data (June 2025)
Check current availability and stock of Siemens 6BK1621-0AA00-0AA0
According to Automa.Net, the Siemens 6BK1621-0AA00-0AA0 is currently in stock at 29 different distributors, with a total of 40 factory-sealed units available worldwide. The lowest price is €535.13
✅ Verified stock from Automa.Net, updated 12.06.2025.
The price and availability are subject to change. To get the most up-to-date information, we recommend:
- Checking B2B platforms such as Automa.Net.
- Contacting an official Siemens distributor in your region.
- Looking up the part number in the Siemens Industry Mall portal.
Industrial Applications
Siemens 6BK1621-0AA00-0AA0 is widely used in:
- Building Automation (BMS) – HVAC, lighting, security, energy control
- Data center infrastructure – for cross-protocol communication
- Factory upgrades and retrofit projects – where BACnet and PROFINET coexist
- Smart Cities and Infrastructure Projects
- Integration with SCADA systems such as WinCC, iFIX, or Ignition
This device bridges legacy systems using BACnet with modern industrial automation powered by PROFINET – minimizing upgrade costs and extending the lifespan of existing installations.
Purchasing Considerations
- Choose factory-sealed condition when long-term reliability and compliance are required
- Verify BACnet version (BACnet/IP only; not compatible with MS/TP)
- TIA Portal compatibility starts from version V14 SP1
- BACnet certification and integration options are fully documented by Siemens
- Web server interface simplifies diagnostics and commissioning
Frequently Asked Questions (FAQ)
Question 1: Does this gateway support the BACnet MS/TP protocol?
Answer: No. The 6BK1621-0AA00-0AA0 gateway only supports the BACnet/IP protocol. It does not include an RS-485 serial interface and cannot communicate with devices using BACnet MS/TP. Integration with MS/TP networks would require an additional device such as a BACnet/IP to BACnet MS/TP router. Source: Product datasheet, which clearly specifies the supported protocol as "BACnet/IP."
Question 2: Do I need a special license to configure the gateway in TIA Portal?
Answer: No. To fully configure the PN/BACnet LINK gateway in the TIA Portal environment, a standard license for STEP 7 software (e.g., STEP 7 Basic or Professional) version V14 SP1 or newer is sufficient. No additional or paid BACnet-specific license packages are required. Source: Device manual and general licensing guidelines for TIA Portal communication modules.
Question 3: Which Siemens PLCs are compatible with this gateway? Will it work with my old S7-300?
Answer: The gateway functions as a PROFINET IO-Device. This means it can be connected to any Siemens PLC that supports the PROFINET IO-Controller role. This includes:
All SIMATIC S7-1500 controllers
All SIMATIC S7-1200 controllers (with appropriate firmware version)
Decentralized units such as ET 200SP CPU and ET 200S CPU
Older S7-300/400 controllers, provided they are equipped with a PROFINET interface functioning as an IO-Controller (e.g., integrated in the CPU or via a communication processor like CP)
Source: Technical PROFINET specifications for the module, which define its role as an IO-Device.
Summary
The Siemens 6BK1621-0AA00-0AA0 is a high-value gateway module that enables smooth integration between PROFINET-based PLCs and BACnet/IP-based systems. It is particularly suited for building automation, infrastructure, and hybrid industrial systems. With broad availability and a wide range of price options across Europe and beyond, it is a competitive solution for both new installations and retrofit projects.