The Siemens 6GT2002-0GA10 is a MOBY communications module ASM475 that serves as the interface between an S7-300 or ET200M rack and up to two RFID read/write heads (readers). It handles the acyclic communication to the transponders via the RS422 interface, with a maximum cable length of 1000 m per reader connection. It mounts directly on the S7-300 rack (40 mm wide, 125 mm high, 120 mm deep) and draws power from the backplane bus at a rated 24 VDC, with a permissible range of 20 to 30 VDC. The module is parameterized via the object manager or GSD file, and programmed using function blocks FB 45, FB 55, and FC 56 (FC 45/55 with limited functionality). Four LEDs per reader connection and two for device status provide local diagnostics — useful during commissioning or fault isolation without needing to connect a programming device.
This module is designed for the SIMATIC S7-300 family and the ET200M distributed I/O system, specifically for use with Siemens RF200/300, MV400/500, and MOBY D/E/I/U identification systems. It communicates over the S7 backplane bus and supports both PROFIBUS and Industrial Ethernet interfaces as determined by the head module of the rack. The front connector (screw-type or spring-loaded, ordered separately) carries the supply voltage and the RS422 point-to-point connections to the readers. The housing is IP20 rated, so it belongs inside a clean, enclosed control cabinet — not in a washdown or dusty environment. Shock resistance per IEC 61131-2 at 150 m/s², vibration at 10 m/s² — within tolerance for standard industrial panel mounting on a DIN-rail rack.