Siemens 6ES7241-1CH32-0XB0 CM 1241 Communication Module RS422/485

The Siemens 6ES7241-1CH32-0XB0 is the SIMATIC S7-1200 CM 1241 RS422/485 communication module, designed to extend the S7-1200 PLC with a serial RS422/485 interface via a 9-pole D-sub socket. It supports Freeport, Modbus RTU, USS, ASCII, and 3964(R) protocols, with a maximum cable length of 1,000 m and 24 V DC supply.

Technical specifications:

• MLFB: 6ES7241-1CH32-0XB0
• Manufacturer: Siemens
• Product line: SIMATIC S7-1200
• Product type: CM 1241 RS422/485 communication module
• Interface: RS422/485 (X.27), 9-pole D-sub socket
• Number of interfaces: 1
• Supply voltage: 24 V DC (range: 20.4 - 28.8 V DC)
• Current consumption: 220 mA max (from backplane bus 5 V DC)
• Power loss: 1.1 W typical
• Max. cable length: 1,000 m
• Max. telegram length: 1 kbyte (Freeport and 3964(R))
• Modbus RTU address area: 1 - 49,999; max. 247 slave devices
• 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, non-condensing
• Dimensions (W x H x D): 30 x 100 x 75 mm
• Weight: approx. 155 g
• Certifications: CE, UL, cULus, CSA, FM, RCM, KC, Marine

Features and benefits:

• Supports Freeport, Modbus RTU master/device, USS, ASCII, and 3964(R) protocols
• RS422/485 interface allows point-to-point and multi-drop serial communication up to 1,000 m
• Diagnostics LED for output status monitoring
• Wide operating temperature range suits industrial environments
• Broad international approval portfolio including CE, UL, FM, and maritime certifications

Applications:

• Connecting S7-1200 PLCs to Modbus RTU networks in industrial automation
• Serial communication with drives, HMIs, and field devices via USS or ASCII protocols
• Integration into multi-drop RS485 bus systems with up to 247 devices
• Long-distance serial data transmission in process and factory automation

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

Also known as: Siemens 6ES7241-1CH32-0XB0, SIMATIC CM 1241 RS485 module, S7-1200 RS422 communication module.