Siemens 6ES7241-1CH30-1XB0 CB 1241 RS485 Communication Board S7-1200

The Siemens 6ES7241-1CH30-1XB0 is the CB 1241 RS485 Communication Board for the SIMATIC S7-1200 PLC series. It plugs into the CPU's communication board slot and adds a point-to-point RS485 serial interface via terminal block, supporting cable runs up to 1,000 m. Supply current draw from the backplane bus is 50 mA at 5 V DC, with a typical power loss of 1.5 W.

Technical specifications:

• MLFB: 6ES7241-1CH30-1XB0
• Manufacturer: Siemens
• Product line: SIMATIC S7-1200
• Product type: CB 1241 RS485 Communication Board
• Interface: RS485, terminal block
• Max. cable length: 1,000 m
• Input current from backplane bus (5 V DC): 50 mA typical
• Power loss: 1.5 W typical
• Max. telegram length: 1 kbyte
• Bits per character: 7 or 8
• Stop bits: 1 (standard) or 2
• Parity: none, even, odd, mark, space
• Modbus RTU master address area: 1 - 49,999; max. 247 devices (max. 32 per network segment)
• 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): 38 x 62 x 21 mm
• Weight: approx. 40 g
• Certifications: CE, UL, cULus, CSA, FM, RCM, KC, Marine

Features and benefits:

• Supports Freeport, ASCII, Modbus RTU master, Modbus RTU device, and USS protocols
• USS and ASCII available as library functions for easy integration
• 3964 (R) protocol support for legacy device communication
• Diagnostic function included for fault monitoring
• Wide operating temperature range suits industrial environments
• Compact form factor installs directly on the S7-1200 CPU without additional rail space

Applications:

• Connecting S7-1200 PLCs to RS485 serial field devices and sensors
• Modbus RTU master/slave networks in building automation and process control
• Variable speed drive control via USS protocol
• Integration with legacy serial equipment using Freeport or 3964 (R) protocol
• Maritime and industrial installations requiring broad approval certifications

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

Also known as: Siemens 6ES7241-1CH30-1XB0, SIMATIC CB 1241 RS485, S7-1200 RS485 communication board.