Siemens 6ES7241-1AH32-0XB0 SIMATIC S7-1200 CM 1241 RS232 Communication Module

The Siemens 6ES7241-1AH32-0XB0 is a SIMATIC S7-1200 Communication Module CM 1241 RS232, providing a single RS232C (V.24) serial interface via a 9-pole D-sub connector. It supports Freeport, ASCII, Modbus RTU master, and Modbus RTU device protocols, with a maximum cable length of 10 m and 24 V DC supply voltage.

Technical specifications:

• MLFB: 6ES7241-1AH32-0XB0
• Manufacturer: Siemens
• Product line: SIMATIC S7-1200
• Product type: CM 1241 RS232
• Interface: RS232C (V.24), 9-pole D-sub (pin)
• Number of interfaces: 1
• Cable length, max.: 10 m
• Supply voltage: 24 V DC (range 20.4 - 28.8 V DC)
• Current consumption, max.: 200 mA (from backplane bus 5 V DC)
• Power loss, typ.: 1.1 W
• Protocols: Freeport, ASCII, 3964 (R), Modbus RTU master, Modbus RTU device
• Max. telegram length: 1 kbyte
• Bits per character: 7 or 8
• Stop bits: 1 or 2
• Parity: none, even, odd, mark, space
• Modbus address area: 1 through 49 999
• IP degree of protection: IP20
• Operating temperature: -20 °C to 60 °C (horizontal), -20 °C to 50 °C (vertical)
• Storage/transport temperature: -40 °C to 70 °C
• Relative humidity, max.: 95% (at 25 °C, no condensation)
• Dimensions (WxHxD): 30 x 100 x 75 mm
• Weight, approx.: 150 g
• Certifications: CE, CSA, UL, cULus, FM, RCM, KC, Marine

Features and benefits:

• Single RS232C point-to-point serial interface with 9-pole D-sub connector
• Integrated support for Freeport, ASCII, 3964 (R), and Modbus RTU master/device protocols
• Modbus RTU master supports up to 247 slave devices per network segment (max. 32 per segment without repeaters)
• Diagnostics indication LED for output status monitoring
• Wide operating temperature range of -20 °C to 60 °C for industrial environments
• Compact form factor: 30 mm wide, fitting standard S7-1200 system rail mounting

Applications:

• Serial point-to-point communication between S7-1200 PLCs and RS232-compatible field devices
• Modbus RTU master/device integration in automation and process control systems
• Freeport and ASCII protocol communication with barcode readers, printers, or weighing systems
• 3964 (R) protocol data exchange with legacy industrial equipment
• Maritime and industrial applications requiring broad international approval certifications

Compliant with CE, UL, CSA, FM, RCM, and KC standards. Part of the Siemens SIMATIC S7-1200 range.

Also known as: Siemens 6ES7241-1AH32-0XB0, Siemens CM 1241 RS232, SIMATIC S7-1200 RS232 communication module.