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

The Original New Siemens 6ES7241-1CH32-0XB0 SIMATIC S7-1200 CM 1241 Communication Module is a point-to-point serial communication module designed for S7-1200 PLC systems, enabling reliable RS422/RS485 serial data exchange with third-party devices such as printers, barcode readers, modems, robot controllers, and drives. It supports Freeport, Modbus RTU (master/slave), USS, ASCII, and 3964(R) protocols with a 9-pin D-sub female connector. The module plugs directly into the CPU, expanding serial communication capabilities without taking up additional panel space.

Core Engineering Highlights:
RS422/RS485 serial interface | 9-pin D-sub female connector | Freeport, Modbus RTU, USS, ASCII, 3964(R) protocol support | 115.2 kbps max baud rate | 1,000 m max cable length | 24V DC | 220 mA current consumption | 1.1 W power loss | 30 x 100 x 75 mm | IP20 | -20°C to +60°C operating temperature | 1 kbyte max telegram length

Key Features:

• Original New Siemens 6ES7241-1CH32-0XB0 module

• Point-to-point serial communication via RS422/RS485

• 9-pin D-sub female connector

• Supports Freeport protocol for user-defined communication

• Modbus RTU master and slave support (address area 1-49,999, up to 247 devices)

• USS protocol support for drive communication (available as library function)

• ASCII protocol support for printer and scanner communication (available as library function)

• 3964(R) protocol support

• 1,000 m maximum cable length for flexible system placement

• Baud rates from 300 bps to 115.2 kbps

• Telegram length up to 1 kbyte

• Configurable data format: 7 or 8 data bits, 1 or 2 stop bits, parity options (none, even, odd, mark, space)

• Diagnostic LED for module status indication

• Receive and transmit LEDs for data activity monitoring

• Direct plug-in to S7-1200 CPU – no external power supply required

• IP20 protection rating for control cabinet installation

• CE, UL, cULus, CSA, FM, RCM, KC, and Marine approvals

Applications:

• Connecting barcode readers and scanners to S7-1200 PLCs

• Serial communication with printers for data logging and reporting

• Integration with third-party controllers and automation systems

• Drive communication via USS protocol with Siemens drives

• Modbus RTU networking with sensors, meters, and instrumentation

• Custom serial communication via Freeport protocol

• Legacy system integration and serial device connectivity

Technical Specifications:

Supply Voltage:

Current & Power:

Interfaces:

Protocol Support:

Diagnostics:

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Certifications:

System Compatibility:

• Siemens SIMATIC S7-1200 PLCs (all CPU variants: 1211C, 1212C, 1214C, 1215C, 1217C)

• TIA Portal engineering framework (requires HSP for latest versions)

• Third-party devices supporting RS422/RS485, Modbus RTU, or ASCII protocols

• Siemens drives via USS protocol

• Printers, barcode readers, scanners, modems, and robot controllers

Typical System Architecture:
S7-1200 CPU
↓
6ES7241-1CH32-0XB0 CM 1241 Module (plugs directly into CPU)
│
├── RS422/RS485 9-pin D-sub Female Connector
│
└── Serial Devices (Printers, Scanners, Drives, Modbus RTU Networks, etc.)
↓
TIA Portal Configuration (Freeport, Modbus RTU, USS, ASCII, 3964R)

Related Products:

• 6ES7241-1CH30-1XB0 – CB 1241 RS485 (communication board, RS485 only, lower profile)

• 6ES7241-1AH32-0XB0 – CM 1241 RS232 (RS232 only)

• 6ES7241-1CH32-0XB0 – CM 1241 RS422/485 (current model)

• 6ES7274-1XF30-0XA0 – SIMATIC HMI SD card for data logging

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