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

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

SIEMENS · SIMATIC S7-1200

6ES7241-1AH32-0XB0

CM 1241 RS232 Communication Module

OFFICIAL LIFECYCLE

ACTIVE PRODUCT

Phase-out from 01.11.2026

Interface

RS232C

Connector

9-pin D-sub

Cable

10 m max.

Supply

24 V DC

Selection gate: Confirm S7-1200 CPU, TIA Portal project, RS232 pin assignment, protocol, serial settings, cable length and peer device.

Direct inquiry

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Overview
Applications
Data
Construction
Environment
Installation
Verification
Commercial
Models
Recommended Products

Official product overview

CM 1241 RS232 Communication Module

SIMATIC S7-1200 CM 1241 communication module with one RS232C interface, 9-pole D-sub pin connector and Freeport support.

Exact MLFB

6ES7241-1AH32-0XB0

Family

SIMATIC S7-1200

Status

ACTIVE PRODUCT

Lifecycle: Siemens Industry Mall lists 6ES7241-1AH32-0XB0 as active with phase-out effective 01.11.2026. Stock and delivery remain subject to verification.

Applications

Point-to-point serial communication for S7-1200

Connect an S7-1200 system to compatible RS232 devices.
Use Freeport for application-defined serial telegrams.
Use Modbus RTU master or device functions where supported.
Use ASCII library functions or 3964(R) after matching both communication partners.

Application note: Electrical interface compatibility does not guarantee protocol compatibility; confirm pinout, cable and peer settings.

Data

Product-specific values from Siemens official product data and manuals.

Port

1 × RS232C

Cable

10 m max.

1 KB max.

Loss

1.1 W

Product type	CM 1241 RS232
Interface	RS232C (V.24)
Number of interfaces	1
Connector	9-pole D-sub, pin
Cable length	10 m maximum
Freeport	Supported
ASCII	Supported through library function
Modbus RTU	Master and device supported
3964(R)	Supported
Maximum telegram	1 KB
Character format	7 or 8 data bits; 1 or 2 stop bits
Parity	None, even, odd, mark or space
Rated supply	24 V DC
Supply range	20.4 to 28.8 V DC
Backplane current	200 mA maximum at 5 V DC
Typical power loss	1.1 W

Construction

One RS232 serial channel for S7-1200 point-to-point communication.

RS232 connectorNine-pole D-sub pin connector.	Single channelOne RS232C interface.
S7-1200 backplaneExchanges data through the backplane.	24 V DC supplyObserve official terminals and voltage range.
Protocol driverConfigure documented serial functions in project.	Status indicationUse LEDs and online diagnostics.
Cable routingApply official grounding and routing.	Nameplate checksVerify MLFB, hardware and firmware.

Environment

Use the communication module within S7-1200 cabinet limits.

Installation	Industrial control cabinet
Operating temperature	Confirm for exact mounting orientation
Storage / transport	Subject to official data-sheet verification
Cable environment	Route away from interference sources
EMC	Apply S7-1200 grounding and separation
Altitude / derating	Subject to system manual
Approvals	Verify current destination-specific scope

Protection note: Communication reliability depends on correct cable, grounding, separation and peer settings.

Installation

Coordinate CPU, module position, 24 V supply, serial cable and software parameters.

CPU compatibilityConfirm CPU and project support exact CM article.	Mechanical installationUse official S7-1200 procedure.
24 V DC wiringUse documented terminals.	RS232 cableCorrect pinout and maximum 10 m.
Protocol settingsMatch baud, data bits, stop bits and parity.	Peer deviceConfirm electrical standard and protocol.
Project downloadConfigure CM and instructions in TIA Portal.	CommissioningCheck LEDs, diagnostics and telegram counters.

Verification

Confirm the exact article, hardware state and complete system context before replacement or quotation.

Exact MLFB	6ES7241-1AH32-0XB0
S7-1200 CPU	Confirm MLFB and firmware
TIA Portal project	Confirm catalog entry and parameters
RS232 peer	Confirm connector and pinout
Protocol	Confirm Freeport, Modbus RTU, ASCII or 3964(R)
Serial settings	Confirm baud and character format
Cable	Confirm pin mapping and length up to 10 m
Lifecycle planning	Account for phase-out date

Quotation input: Send CPU MLFB, project version, peer-device manual, pinout, protocol, serial settings and cable length.

Commercial

FAQ and procurement answers use written verification instead of unsupported promises.

Stock

Confirm before quotation

Condition

Stated in writing

Evidence

Available on request

Is this confirmed in stock?	Confirm before quotation for the exact article, quantity and destination.
New, used or refurbished?	The quoted condition is stated in writing. No condition is assumed.
Can current photos be supplied?	Current overall-unit and nameplate photos are available on request.
Has the unit been tested?	Available on request and subject to the agreed inspection or test scope.
Warranty period	Confirmed in the formal quotation.
Dispatch time	Confirmed after stock, destination and order approval are verified.
Payment methods	Available on request in the formal quotation.
Quotation response	Subject to request completeness and verification.
How is the transaction verified?	Company details, quotation, invoice and beneficiary information are available for review before payment.
Compatibility	Do not assume interchangeability with RS422/485 variants. Confirm interface, connector, protocol and project support.
Included accessories	Serial cable and connector accessories are subject to verification and not assumed included.
Official product status	Siemens Industry Mall lists 6ES7241-1AH32-0XB0 as active with phase-out effective 01.11.2026. Stock and delivery remain subject to verification.

Models

Fifty automation references selected from the supplied model lists. Confirm every alternative before quotation.

U539	MTN682191	10-032-N	DDRC420FR	05-7063-JMD01S1-R0BK
025-30889-000	M204.32	GXE51A1B	Nov-33	SDV144-S33/PRP
245-5829	A7708LT-COAX-50	TTM45IIII	WTS3B4BMB/N	1100-0-4
MTN6500-0113	03900	M850-MP1	7000-5201-1	852-063-003
GS550	1007007000.0101	ECM-UM08-04-E7GF-ULL	ADV551-PF0	70100AEP0N
Ts-919B1	PLC-3.3EACI8C	SB-DN-D0403	MDR-60-24	0160-001-01
JBS-100-EP	PS-2121	51-41-RX1	1756-PA75R	CEPL130445-03-R
2APS-PSU-60	J9734A	C200H-0C225	330180-12-05	TUC0311-2RY
HRCPDG42R	031-02476-001	VT9611D3100-BACnet	201-928.CE.P	SCREENX-CT2
MK13-VP-EX0	DCU103	CP17973	PC-301	APG0001-0701E