Siemens 6ES7461-0AA01-0AA0 - Expansion Rack Interface Module with C-Bus

Extend your system's capabilities with the Siemens 6ES7461-0AA01-0AA0 IM 461-0. This is a receiver interface module designed for SIMATIC S7-400 expansion racks. When paired with a central rack sender module (IM 460-0), it allows you to add remote racks that support not only I/O modules but also communication and function modules (CPs/FMs), thanks to the extended Communication (C) Bus. Each expansion rack requires its own power supply.

Complete Technical Specifications

Brand & Series: Siemens SIMATIC S7-400

Full Model Number: 6ES7461-0AA01-0AA0 (Interface Module IM 461-0)

Module Type: Receiver Interface Module for Expansion Rack

Function: Slave module for connecting expansion racks to a central rack (paired with IM 460-0).

Bus Transfer: Transfers I/O data (P bus) and Communication bus (C bus). Does NOT transfer 5V power (PS).

Compatible Sender: Must be used with IM 460-0 (6ES7460-0AA01-0AA0) in the central rack.

Max Cable Length: 5 meters between the first and last interface module in a chain.

Termination Plug: Required (6ES7461-0AA0-7AA1) for the last receiver in the chain.

Power from Backplane: 5V DC, max 290 mA (for module logic, not for rack power).

Module Power Loss: Maximum 1.45 W

Dimensions (W x H x D): 25 mm x 290 mm x 280 mm

Weight: Approximately 610 g

Installation & Compatibility Guide

Install this 6ES7461-0AA01-0AA0 IM 461-0 module in an S7-400 expansion rack that has its own power supply (PS). The central controller rack must contain the matching IM 460-0 sender. Connect them using the 468-1 interface cable. Set a unique rack number (0-21) via the address switch on the module. Install a termination plug on the last IM 461-0 in the chain. This setup allows you to place communication processors (CP) or function modules (FM) in this remote rack.

Package Contents & Warranty

What's Included: 1 x Siemens IM 461-0 Receiver Interface Module (6ES7461-0AA01-0AA0).

Note: The matching central sender (IM 460-0), interface cables (468-1), termination plug, and a separate power supply for the expansion rack are required and sold separately.

Our Guarantee: This product is covered by a full 12-month warranty.

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Frequently Asked Questions (FAQ)

What is the key advantage of IM 461-0 over IM 461-1?

The IM 461-0 extends the C-Bus, allowing communication (CP) and function (FM) modules in the expansion rack. The IM 461-1 does not extend the C-Bus, so only I/O modules are allowed in its expansion rack.

Does this module power the expansion rack?

No. The IM 461-0 does not transfer power from the central rack. You must install a separate power supply module (PS) in the expansion rack to power all the modules within it.

How many of these expansion racks can I add?

You can connect up to 21 expansion racks using the IM 460-0/IM 461-0 pair, which is significantly more than the 4-rack limit of the IM 460-1/461-1 pair.

What is the termination plug for?

The termination plug (6ES7461-0AA0-7AA1) must be installed on the last IM 461-0 receiver module in the daisy-chain. It ensures proper electrical termination of the bus signals to prevent reflection and communication errors.

Can I use a longer cable than 5 meters?

No. The maximum permitted cable length between the first and last interface module in a chain is 5 meters when using the IM 460-0/461-0 pair. Exceeding this can cause data corruption.

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