The Siemens 6ES7155-6AU01-0CN0 is the PROFINET bus adapter for the ET 200SP distributed I/O system, supporting isochronous real-time communication with a 1 µs jitter and MRP for media redundancy. IRT operates in frame intervals from 250 µs to 4 ms, selectable in 125 µs increments, making this module suitable for motion-control and high-speed synchronization applications where deterministic timing is required. The I2t rating of 0.25 A²·s is a thermal let-through energy value for the module's internal protection; reference it when sizing upstream branch-circuit protection.
Network Integration
Two PROFINET ports via a plug-in BusAdapter support line or ring topologies; autocrossing and auto-negotiation are standard. LLDP and SNMP are available for network management, and the module supports shared-device configurations and H-Sync forwarding. Alarm generation, I&M data (I&M0 to I&M3), and PROFIenergy are built in. PROFIsafe via a dataset is supported, but MRPD is not. Maximum cycle time is 4 ms. Status and diagnostics are indicated by RUN (green), ERROR (red), and MAINT (yellow) LEDs on the front face.