Siemens SIMATIC S7-1200 RS485 Communication Module 6ES7241-1CH32-0XB0

The Siemens 6ES7241-1CH32-0XB0 is a communication module for the SIMATIC S7-1200 series, providing a single RS485 interface via screw terminals. It supports Modbus RTU (master/slave) and USS protocols, enabling seamless integration with drives, sensors, and other field devices. With data rates up to 115.2 kbit/s and electrical isolation, it ensures reliable data exchange in industrial environments. Configuration is performed via TIA Portal, simplifying setup and diagnostics.

Advantages

This module offers flexible serial connectivity for S7-1200 PLCs, supporting both Modbus RTU and USS protocols. Its electrical isolation protects the backplane bus from interference, while the wide operating temperature range (-20 °C to +60 °C) suits harsh industrial conditions. The screw terminal connection allows quick and secure wiring, and DIN rail mounting integrates easily into existing control cabinets.

Suitable for

• Connecting Modbus RTU slave devices such as energy meters, drives, and sensors
• Controlling Siemens drives via USS protocol
• Extending S7-1200 PLC communication capabilities in factory automation
• Applications requiring reliable RS485 communication over long distances

Key specifications

• Module type: Communication module
• Interface: RS485 (1 port)
• Protocols: Modbus RTU (master/slave), USS (master)
• Data transmission rate: 9.6 kbit/s to 115.2 kbit/s
• Supply voltage: 24 V DC via backplane bus
• Current consumption: max. 40 mA
• Power loss: max. 1 W
• Electrical isolation: between interface and backplane bus
• Mounting: DIN rail
• Operating temperature: -20 °C to +60 °C (horizontal), -20 °C to +50 °C (vertical)
• Protection class: IP20
• Configuration: TIA Portal

Recommendations

For reliable serial communication in SIMATIC S7-1200 systems, this module is an excellent choice. Ensure proper grounding and use shielded twisted-pair cables for RS485 networks to minimize noise. Configure the module using the latest version of TIA Portal for optimal performance.