PROFINET IO Device with Integrated 2-Port Switch
The Siemens 6ES7155-5AA00-0AA0 is the IM 155-5 PN BA interface module for the ET 200MP distributed I/O system. It operates as a PROFINET IO Device with an integrated 2-port switch, so you can daisy-chain the line topology without an external switch — each port runs at 100 Mbps with autocrossing and autonegotiation enabled. Network redundancy is handled through Media Redundancy Protocol (MRP), and the module supports LLDP for topology discovery and SNMP for network management. It does not support IRT (isochronous real-time) or MRPD, so this is the right choice for standard PROFINET RT applications — not for motion-control axes needing deterministic cycle jitter below 1 ms.
DIN-Rail Fit and Power Budget
The module snaps onto a standard 35 mm DIN rail and measures 35 mm wide by 147 mm high by 129 mm deep — it occupies a single slot in the ET 200MP rack. Typical power loss is 3 W from the 24 VDC supply, with a max inrush current of 2.8 A on power-up. The I2t rating of 0.04 A²·s tells you the fuse or power supply branch can handle that short energy pulse without nuisance tripping. Status indicators are on the front: a green RUN LED, a red ERROR LED, and a yellow MAINT LED. The module supports I&M data records I&M0 through I&M3 for asset tracking, and diagnostics are available via PROFINET alarms.