CM 1241 · RS232C · FREEPORT AND MODBUS RTU MASTER
Siemens 6ES7241-1AH32-0XB0 SIMATIC S7-1200 CM 1241 RS232 Communication Module
A single-port S7-1200 serial communication module with a male 9-pin D-sub interface for point-to-point RS232 applications.
Overview
6ES7241-1AH32-0XB0 is Siemens CM 1241 RS232 for SIMATIC S7-1200. It provides one electrically isolated RS232C interface through a 9-pin D-sub male connector and supports Freeport communication plus Modbus RTU master operation.
The serial framing parameters are project controlled. Siemens specifies telegrams up to 1 kbyte and configurable data bits, stop bits and parity, so a replacement requires both the hardware identity and the original communication settings.
Specifications
Features
Dedicated RS232 port
Adds a documented point-to-point serial interface to an S7-1200 station.
Protocol flexibility
Freeport supports application-defined framing while the module also supports Modbus RTU master use.
Project-held parameters
Baud rate, data format, timing and protocol logic remain part of the TIA Portal record.
Short-link discipline
The published 10 m cable limit separates this module from long-distance RS422/485 installations.
Applications
Serial instrument link
Connecting one documented RS232 device to an S7-1200 controller.
Legacy equipment integration
Exchanging defined telegrams with a machine device through Freeport.
Modbus master channel
Polling a supported Modbus RTU slave over the approved point-to-point wiring.
Lifecycle
Archive
Save protocol blocks, port settings, device address logic and cable/connector documentation.
Connect
Confirm the male 9-pin pinout, shielding and 10 m cable limit before energizing the link.
Exercise
Test representative telegrams, timeouts, error handling and recovery while the machine remains controlled.
FAQ
Q01
What project information should accompany a 6ES7241-1AH32-0XB0 request?
+
Send the CPU order number, TIA Portal release, module slot, baud rate, framing, protocol blocks, pinout and device identity.
Q02
Can 6ES7241-1AH32-0XB0 directly replace 6ES7241-1CH32-0XB0?
+
No. The AH32 module is RS232; the CH32 module is RS422/485 with different connector gender, topology and distance.
Q03
What cable limit applies to 6ES7241-1AH32-0XB0?
+
Siemens specifies a maximum RS232 cable length of 10 m.
Q04
How should a silent 6ES7241-1AH32-0XB0 port be diagnosed?
+
Check connector pinout, signal ground, baud and frame settings, protocol role, timeout logic and peer-device status.
Q05
What proves 6ES7241-1AH32-0XB0 communication is restored?
+
Record successful request/response traffic, error recovery, timeout behavior and stable machine operation with the approved project.
About IndustryParts
https://www.industryparts.com/Exact identity before quotation
IndustryParts prepares 6ES7241-1AH32-0XB0 enquiries around the complete manufacturer label, requested quantity and destination. For controlled replacements, include the host-system record, field photographs and configuration evidence that apply to this exact execution.
Send the complete 6ES7241-1AH32-0XB0 label, requested quantity and destination.
