Siemens 6ES7 972-0AA00 RS 485 Repeater Module

Siemens 6ES7972-0AA00-0XA0 RS-485 Repeater Module is a compact RS-485 repeater for PROFIBUS/MPI networks, used to extend RS-485 segments and connect PROFIBUS/MPI bus systems with a maximum of 31 nodes. It supports baud rates up to 12 Mbit/s and provides IP20 protection for indoor industrial environments, making it suitable for integration in OEM equipment, field devices, and control cabinets. The module is powered from a 24 V DC supply and uses standard RS-485 bus connections labeled A1/B1 and A2/B2 to repeat signals across longer cable runs. As part of the SIMATIC S7 family, it fits within the PROFIBUS/MPI ecosystem for extending networks between controllers and remote I/O, bridging MPI segments and ensuring reliable communication in legacy automation setups. Typical installations include extending PROFIBUS networks between PLCs and remote I/O, bridging MPI segments in legacy automation, and enabling longer cable runs without signal loss; reliable operation relies on proper repeater placement to maintain robust RS-485 differential signaling across bus segments.