Siemens 6ES7461-0AA00-7AA0: Essential Terminating Connector for S7-400 Expansion

Complete your S7-400 remote rack installation correctly. The Siemens 6ES7461-0AA00-7AA0 is a simple yet critical accessory. This terminating connector installs onto an IM 461-0 receiver interface module in an expansion rack. It ensures proper electrical termination of the bus signals, which is vital for stable and reliable communication between racks.

Product Specifications & Details

• Product Model: Siemens 6ES7461-0AA00-7AA0.
• Product Type: Terminating Connector (accessory).
• Compatibility: Designed specifically for use with the IM 461-0 Receiver Interface Module.
• Parent System: Part of the SIMATIC S7-400 automation system family.
• Weight: Lightweight at approximately 80 grams.
• Installation: Plugs directly onto the IM 461-0 module; no tools required for connection.

Installation & Usage Notes

• Required Use: Must be installed on the IM 461-0 module in the last expansion rack of a series, or on a standalone expansion rack.
• Location: Plugs into the front or side connector slot designated for termination on the IM 461-0.
• Do Not Use With: This specific model is for IM 461-0 only. Other interface modules (like IM 461-1, -3, -4) require their own specific terminating connectors.

Packaging & Ordering Information

• This accessory is supplied as a single terminating connector.
• We include it automatically with new IM 461-0 modules or it can be ordered separately as a spare part.
• Worldwide shipping is available via FedEx, UPS, and DHL for quick delivery.

Expert FAQs for System Integrators

• What happens if I forget to install the terminating connector?
  Without it, the bus signals are not properly terminated, leading to signal reflections. This can cause random communication errors, I/O faults, or complete loss of connection to the expansion rack.
• Do I need one for every IM 461-0 module in a chain?
  No. You only need one terminating connector for the very last IM 461-0 module at the end of the bus chain. Intermediate racks in a series do not use it.
• Is it just a physical plug, or does it contain electronics?
  It contains passive resistor networks that provide the correct termination impedance for the bus lines. It is a simple but electrically necessary component.
• Can I use a wire or resistor instead of this official part?We strongly advise against it. Using an incorrect termination value or method can damage the interface modules or lead to persistent system instability. Always use the specified Siemens accessory.
• How do I identify if my IM 461 module needs this specific connector?
  Check the order number on your IM 461 module. If it ends with "-0" (e.g., IM 461-0), you need this 6ES7461-0AA00-7AA0 terminating connector. Other variants like IM 461-3 use a different terminator.

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