The Siemens 6ES7241-1AH30-0XB0 is a spare-part Communication Module CM 1241 for the SIMATIC S7-1200 system, providing a single RS232 (V.24) interface via a 9-pole D-sub connector (pin configuration) with Freeport protocol support. Rated for the full S7-1200 environmental envelope: operating temperature from -40 °C to 70 °C, with a permissible change rate of 3 °C/min between 5 °C and 55 °C. The module draws 220 mA from the L5+ logic supply, dissipating a typical 1.1 W — well within the backplane budget for a mixed I/O rack. At 30 mm wide and 100 mm tall, it occupies a single S7-1200 module slot to the right of the CPU.
Power loss of 1.1 W typical means negligible heat contribution inside the enclosure — no derating concern even in a densely populated S7-1200 rack.
Integration note
Mounts directly on the S7-1200 DIN-rail assembly, snapped onto the right-side bus connector of the CPU or a preceding signal module. The 9-pin D-sub faces outward for cable access — plan for at least 75 mm clearance behind the panel door to accommodate the connector and cable bend radius. The module is configured entirely through TIA Portal (STEP 7); no DIP switches or rotary address selectors. Freeport protocol is selected in the device configuration, and the serial parameters (baud, parity, data bits) are set in the hardware properties.