Siemens 6ES7461-3AA01-0AA0 Interface Module C7

Siemens 6ES7461-3AA01-0AA0 is the IM461-3 receiver interface module for SIMATIC S7-400, designed to enable distributed coupling of I/O over the K-Bus (Siemens documentation sometimes refers to this bus as C-Bus). The module provides the remote end of a distributed coupling link, allowing data transfer from distant IM devices up to 102 meters away from the central bus. It forms part of the S7-400 family and interoperates with the central controller and other interface modules to create scalable distributed I/O networks. The 6ES7461-3AA01-0AA0 variant specifically identifies the IM461-3 receiver interface in this family, suitable for applications where centralized CPU control must manage distributed sensors and actuators across a factory floor. Use cases include expanding an S7-400 system with remote I/O segments connected through the K-Bus/C-Bus, enabling modular, scalable control architectures without compromising timing and synchronization on the main PLC. The IM461-3 module is typically installed in the SIMATIC rack alongside other IMs and the CPU to facilitate reliable data exchange within the 102 m coupling limit.