Name: Siemens 6ES7241-1AH32-0XB0 | SIMATIC S7-1200 CM 1241 RS232 Communication Module
Brand: SIEMENS
SKU: 2927227
Price: 1 USD
Availability: InStock

Product Information

Siemens 6ES7241-1AH32-0XB0 is the SIMATIC S7-1200 CM 1241 RS232 communication module. It mounts beside a compatible S7-1200 CPU and adds one electrically isolated RS232 channel for serial devices.

On Siemens 6ES7241-1AH32-0XB0, the RS232C port carries Freeport, ASCII and Modbus RTU traffic. The interface uses the configured telegram format and can buffer a telegram of up to 1 kbyte before the CPU program handles it.

For panel planning, Siemens 6ES7241-1AH32-0XB0 uses a 24 V DC supply, draws up to 200 mA, dissipates about 1.1 W and supports a 10 m maximum RS232 cable length. The serial connector and shield reference must be wired as one interface group.

Black and white 3D line drawing exterior view of Siemens 6ES7241-1AH32-0XB0

Product Specifications

Technical itemSpecification

Brand: Siemens
Model: 6ES7241-1AH32-0XB0
Product Name: CM 1241 RS232 communication module
Country: Germany
Interface: RS232C, electrically isolated
Supply Voltage: 20.4–28.8 V DC
Current Consumption: 200 mA maximum
Power Dissipation: 1.1 W
Supported Protocols: Freeport, ASCII, Modbus RTU
Telegram Buffer: 1 kbyte maximum
Data Bits: 7 or 8
Cable Length: 10 m maximum
Mounting: S7-1200 expansion position

Communication and Connectivity

Communication path

Siemens 6ES7241-1AH32-0XB0 places an isolated RS232 endpoint between a CPU program and one serial field device.

RS232 endpoint

The module exposes the serial transmit, receive and signal-reference conductors at its front connector.

Protocol selection

Freeport, ASCII or Modbus RTU is selected in the project so the received bytes are interpreted consistently.

Telegram handling

A configured receive buffer can hold up to 1 kbyte before the CPU logic evaluates the telegram.

Configuration and Programming

Configuration workflow

The serial behavior of Siemens 6ES7241-1AH32-0XB0 is defined in the S7-1200 project rather than by a physical mode switch.

Port parameters

Baud rate, parity, stop bits and data length are set to match the connected instrument.

CPU instructions

The application uses the matching S7-1200 communication instructions for the selected protocol.

Cable boundary

The 10 m RS232 cable limit is checked together with routing, shielding and the field device connector.

Questions & Answers

Why does Siemens 6ES7241-1AH32-0XB0 show received bytes but no valid value?

Siemens 6ES7241-1AH32-0XB0 can receive data while the application still rejects it when baud rate, parity, stop bits or telegram framing differ from the instrument. Match every serial parameter and inspect the receive-complete condition.

How can a Modbus RTU device be connected to Siemens 6ES7241-1AH32-0XB0?

Configure Siemens 6ES7241-1AH32-0XB0 for Modbus RTU, assign the required master or slave behavior in the S7-1200 program and wire the RS232 signal reference exactly as the device requires.

What limits the cable run on Siemens 6ES7241-1AH32-0XB0?

The specified RS232 cable length for Siemens 6ES7241-1AH32-0XB0 is 10 m. Longer routing, unplanned conversions or poor shield termination can turn an apparently correct telegram into intermittent framing errors.

Why does Siemens 6ES7241-1AH32-0XB0 need a separate 24 V supply check?

Siemens 6ES7241-1AH32-0XB0 draws up to 200 mA from the 24 V system. Confirm the CPU-side supply margin and terminal polarity before diagnosing the serial device.

Can Siemens 6ES7241-1AH32-0XB0 use ASCII and Modbus RTU in the same project?

The port on Siemens 6ES7241-1AH32-0XB0 is configured for the required protocol and telegram handling in the project. A single channel is not treated as two simultaneous physical ports.

What should be retained when replacing Siemens 6ES7241-1AH32-0XB0?

Keep the exact hardware order number Siemens 6ES7241-1AH32-0XB0, the project port settings, the serial connector wiring and the device address together so the replacement is not commissioned with a mismatched interface definition.

Company Profile

Moore Automation

https://www.mvme.cn

Moore Automation handles industrial automation enquiries by keeping the manufacturer, exact model, requested quantity and destination in one product record.

The same record can carry technical notes and product images for PLC, I/O, HMI, drive, sensor and monitoring parts, so the requested Siemens interface is not separated from its commercial details.

Product scopePLC, I/O, HMI, drives and monitoring hardware

Model recordsManufacturer and exact order number retained

Multi-brand supplySiemens and other automation ranges

Enquiry continuityQuantity and destination stay with the request

Contact Information

Contact Moore Automation

ManagerLeonia

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Siemens 6ES7241-1AH32-0XB0 | SIMATIC S7-1200 CM 1241 RS232 Communication Module Item NO.: 2927227

Siemens 6ES7241-1AH32-0XB0 | SIMATIC S7-1200 CM 1241 RS232 Communication Module