Siemens 6GK7343-2AH01-0XA0 is the AS-Interface master for S7-300 modular systems, specifically designed to work with redundant IM153 interface modules in ET 200M distributed I/O racks. Galvanic isolation rated at 500 V keeps field-side faults from propagating to the backplane.
Mounts on standard S7 mounting rail; dimensions 40 x 125 x 120 mm (WxHxD) — fits a 40 mm wide slot in an S7-300 rack. Powered via the backplane bus; no separate supply needed. Dissipates 4 W. IP20 rated, so plan for installation in a clean, enclosed control cabinet.
No last-time-buy or phase-out has been announced for this order code. It is sourced to order against an RFQ; typical lead times apply through Siemens distribution.