The Siemens 6AG1688-3AY36-2AX0 is a SIPLUS PROFINET interface module that brings deterministic IRT (isochronous real-time) and MRP (media redundancy protocol) to a control cabinet. It mounts via clamp terminals and presents a 49 mm overall depth including the angled SIMATIC Ethernet connector — a dimension that matters when routing cables past adjacent modules in a dense DIN-rail row.
PROFINET connectivity and controller compatibility
This interface supports PROFINET with IRT, so it can participate in isochronous motion or high-speed I/O loops where jitter must stay under 1 µs. MRP enables ring-topology redundancy for fault-tolerant networks. It communicates with S7-1200 (via ET 200pro CPU and ET 200S CPU), S7-1500, and S7-300/400 controllers running STEP 7 or SIMATIC STEP 7 Basic V11 or higher. Third-party PROFINET PLCs are also supported.
Environmental range and enclosure fit
Rated for -25 °C to 80 °C ambient, so it lives in unheated enclosures or near hot drives without derating. The rear face carries IP20 protection — standard for a panel-mounted device behind a cabinet door. Clamp terminals accept field wiring without special tools; the 49 mm depth includes the angled connector, so plan for that clearance when the gland plate is tight.