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

The Siemens 6ES7241-1CH32-0XB0 is a SIMATIC S7-1200 CM 1241 communication module with an RS422/485 (X.27) serial interface on a 9-pin D-sub socket, supporting point-to-point connections up to 1,000 m. Integrated protocol drivers cover Freeport, ASCII, Modbus RTU master and slave, and USS, letting the module link directly to third-party serial devices or Siemens drives without an external gateway.

Technical Specifications

Certifications & Standards

• CE mark
• CSA approval
• UL approval
• cULus
• FM approval
• RCM
• KC approval
• Marine approval

Selection Notes

RS422/485 gives a two- or four-wire multi-drop link, so it fits Modbus RTU networks with multiple slave devices on one segment, up to 247 addresses under standard Modbus addressing (32 devices per physical segment before a repeater is needed). Where the target device only exposes an RS232 port, the RS232-only CM 1241 variant in the same family is the correct choice instead of this module. The USS protocol driver, available as a library function, lets this module talk directly to Siemens drives over serial USS without a separate PROFIBUS or PROFINET drive interface.

Applications

Serial connection to third-party Modbus RTU devices, legacy point-to-point ASCII equipment, or Siemens drives over USS from an S7-1200 CPU that lacks a native RS422/485 port.