Overview
The 6ES7155-6AU01-0BN0 is a Siemens SIMATIC ET 200SP interface module that provides a 2-port PROFINET switch with integrated IRT support (250 µs to 4 ms in 125 µs frames), MRP, LLDP, and SNMP. It draws 1.9 W and mounts on a Basic Unit, measuring 50 mm wide by 117 mm high by 74 mm deep. RoHS-compliant since 28-04-17.
Function & operation
This interface module acts as the PROFINET IO gateway for an ET 200SP station, handling real-time communication between the controller and distributed I/O. The 2-port switch allows line topology without an external switch, and IRT (Isochronous Real-Time) with 250 µs to 4 ms cycle times in 125 µs increments supports motion control and high-speed applications. MRP (Media Redundancy Protocol) enables ring topologies for network fault tolerance, while LLDP and SNMP provide network diagnostics and asset management. The module supports PROFINET alarms, diagnostics, and PROFINET energy (PROFIenergy) for energy management. Firmware version V4.2 is standard, and the module can be updated via the backplane.
Applications
The 6ES7155-6AU01-0BN0 is used in distributed automation systems where PROFINET IRT and redundancy are required — typical on packaging lines, material handling, assembly cells, and process skids. It connects up to 16 ET 200AL modules via the Basic Unit backplane, making it suitable for modular machine designs with mixed I/O types. The MRP support suits ring topologies in plant networks where a single cable break must not stop production.
Market & positioning
Within the SIMATIC ET 200SP family, this interface module occupies the mid-range position — it offers IRT and MRP but omits Modbus TCP and MRPD (Media Redundancy for Planned Downtime). It is specified by controls engineers who need deterministic PROFINET performance for motion axes but do not require the full redundancy of an MRPD-capable module. The 2-port switch keeps the station compact, avoiding an external switch in the cabinet.