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SIMATIC S7-1200 · CM 1241

SIEMENS 6ES7241-1CH32-0XB0 RS422/485 Communication Module

A serial communication module that connects an S7-1200 station with RS422/RS485 field devices through a 9-pin D-sub socket.

RS422 / RS485
One configurable serial interface

Protocol Ready
Freeport · Modbus RTU · USS

Long-Distance Link
Up to 1,000 m cable length

PRODUCT DESCRIPTION

Serial connectivity for equipment that still matters

The CM 1241 provides a practical route between an S7-1200 controller and serial devices such as energy meters, barcode readers, variable-speed drives, weighing terminals, remote controllers, and vendor-specific instruments.

Its configurable RS422/RS485 interface supports open character-based communication and established industrial protocols, allowing older field equipment and newer compact PLC systems to exchange data without unnecessary architecture changes.

SIEMENS TECHNICAL DATA

Technical Specifications

Article number	6ES7241-1CH32-0XB0
Product designation	CM 1241 RS422 / RS485
Physical interface	1 × RS422/485 (X.27), 9-pole D-sub socket
Rated supply	24 V DC (20.4–28.8 V permissible)
Current consumption	220 mA maximum from 5 V DC backplane bus
Power loss	1.1 W typical
Cable length	Up to 1,000 m
Integrated drivers	Freeport, ASCII library, Modbus RTU master/device, USS library
Freeport telegram length	Up to 1 kbyte
Diagnostics	Supported; LED status indication
Protection / temperature	IP20; −20 °C to +60 °C horizontal installation
Dimensions	30 × 100 × 75 mm (W × H × D)
Approx. weight	155 g

Values are based on the Siemens technical data for article 6ES7241-1CH32-0XB0. Confirm the current manual, CPU compatibility, wiring, termination, and communication settings before commissioning.

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OFFICIAL PRODUCT IMAGE

CM 1241 · 9-PIN D-SUB

Compact serial communication beside the CPU

The slim 30 mm module mounts alongside the S7-1200 CPU and provides a dedicated RS422/RS485 connection for serial field communication.

Status indication supports commissioning and diagnostics, while the D-sub socket gives a clear physical connection point for the configured network.

Selection check
Article number · interface standard · protocol · cable and termination

Image source: Siemens SiePortal product page.

COMMUNICATION TASKS

Purpose & Functions

Connect
Link serial meters, drives, readers, terminals, and controllers.

Translate
Exchange data through Freeport, Modbus RTU, or USS workflows.

Extend
Support point-to-point links up to 1,000 m.

Maintain
Keep established serial equipment connected to an S7-1200 system.

INDUSTRIAL USE

Application Areas

Energy Metering	Drive Communication
Barcode Systems	Building Automation
Water Treatment	Packaging Equipment
Weighing Systems	Retrofit Projects

MODEL-SPECIFIC ANSWERS

FAQ

01 What is the SIEMENS 6ES7241-1CH32-0XB0 used for? It adds an RS422/RS485 serial interface to a SIMATIC S7-1200 station for communication with drives, meters, readers, controllers, and other serial devices.	02 Which protocols does the 6ES7241-1CH32-0XB0 support? Siemens lists Freeport, Modbus RTU master/device, and library-based ASCII and USS communication options.
03 Is the 6ES7241-1CH32-0XB0 a standalone controller? No. It is a CM 1241 communication module used with a compatible S7-1200 CPU; the CPU runs the user program.	04 How long can the cable be for the 6ES7241-1CH32-0XB0? The official technical data specifies a maximum point-to-point cable length of 1,000 m. Actual design should still consider baud rate, cable type, termination, and EMC conditions.
05 Can the 6ES7241-1CH32-0XB0 act as a Modbus master and device? Yes. Its integrated protocol drivers support both Modbus RTU master and Modbus RTU device operation.	06 What should be checked before replacing a 6ES7241-1CH32-0XB0? Confirm the full article number, CPU compatibility, RS422/485 wiring, termination, protocol settings, station address, baud rate, and the saved project configuration.

ORDER INFORMATION

Part No.: 6ES7241-1CH32-0XB0	Payment: TT	Port: Xiamen
Lead time: 3–5 days	Stock: 5000	MOQ: 1
Product weight: 0

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