Siemens 6ES7241-1CH32-0XB0 S7-1200 CM 1241 RS422/485 Communication Module

Siemens SIMATIC S7-1200 CM 1241 communication module for point-to-point serial communication via RS422 or RS485. 9-pin D-sub socket interface supporting Freeport, ASCII, Modbus RTU (master/slave), and USS protocols. Modes include RS422 for point-to-point long-distance communication or RS485 for multi-drop networks with up to 32 nodes. Galvanic isolation between interface and CPU for reliable industrial data exchange.

Applications:

• Serial connection to barcode scanners, printers, and HMIs

• Modbus RTU communication with drives, sensors, and instrumentation

• Custom serial protocol implementation via Freeport

• Legacy system integration with RS422/RS485 equipment

• Point-to-point communication between S7-1200 and third-party devices

Technical Specifications:

• Product type: CM 1241 RS422/485 communication module

• Interface: RS422/RS485, 9-pin D-sub socket (female)

• Supported protocols: Freeport, ASCII (library), Modbus RTU (master/slave), USS (library)

• Transmission rate: 300 bps to 115.2 kbps (configurable)

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

• Cable length max.: 1,000 m (shielded twisted pair, RS485), 1,200 m (RS422)

• Network capacity: Up to 32 nodes per RS485 segment (standard; up to 247 Modbus addresses)

• Diagnostics: Integrated diagnostic LEDs (transmit, receive, error)

• Galvanic isolation: 500V AC between RS485 signals and CPU logic

• Power supply: From S7-1200 backplane bus (5V DC, 220 mA; 24V DC, 20.4-28.8V)

• Power loss: Approx. 1.1 W (typ.)

• Protection rating: IP20

• Dimensions (W x H x D): 30 mm x 100 mm x 75 mm

• Weight: Approx. 155 g

• Operating temperature: -20°C to +60°C (horizontal), -20°C to +50°C (vertical)

• Storage temperature: -40°C to +70°C

• Certifications: CE, cULus, FM, RCM, KC, Marine approval, RoHS compliant

Compatibility:

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

• CPU firmware: V2.0 or higher

• TIA Portal V11 or higher (STEP 7 Basic/Professional)

Related Products:

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

• 6ES7241-1AH32-0XB0 – CM 1241 RS232 (RS232 only, 9-pin D-sub male, 15m cable length)

• 6ES7241-1CH32-0XB0 – CM 1241 RS422/485 (current model, RS422/RS485, 1,000m cable length)

For RS232 applications, select CM 1241 RS232 variant; for space-constrained applications, consider CB 1241 RS485 communication board.

Product Status:
Active product. Maximum 3 CM 1241 modules plus 1 CB 1241 per S7-1200 CPU. Firmware version ≥ V2.1 recommended for Modbus RTU operation. Requires TIA Portal for configuration; protocols configured via integrated parameterization interface.

PLC ERA is an independent industrial automation distributor. Products are sourced through established supply channels and inspected prior to shipment. International shipping available.