The Siemens 6ES7241-1AH32-0XB0 is a single-port RS232C (V.24) serial communication module for the S7-1200 family, supporting both Modbus RTU master and slave protocols. It draws up to 200 mA from the 5 V DC backplane bus and runs on a 24 V DC rated supply, with a typical power loss of 1.1 W. Pressure tolerance from 795 hPa to 1080 hPa covers most non-sealed enclosures. IP20 protection means it lives inside a panel. Handles standard Modbus addressing from 1 to 49,999, supports up to 247 slaves per network segment (practical limit 32 devices per segment without repeaters), transmits telegrams up to 1 kbyte. Cable length limited to 10 m.
Given its active status, lead times are predictable through normal Siemens supply.
Compliance & Approvals
Carries CE, cULus, CSA, FM, KC, Marine, and RCM (C-TICK) approvals. UL and FM approvals are documented. Diagnostics functions are built in, including a status output for outputs, which simplifies fault isolation during commissioning or line-down events.