Product Overview

The SIMATIC S7-1200 Communication Module CM 1241 provides RS232 serial communication capabilities for SIMATIC S7-1200 controllers. Featuring a 9-pole D-sub pin connector and Freeport protocol support, this module enables versatile point-to-point serial communication with industrial devices and legacy systems.

Key Features

• RS232 Interface: Standard V.24 serial communication for point-to-point connections
• Freeport Protocol: Message-based communication with user-defined formats
• 9-Pole D-Sub Connector: Male pin connector for secure connections
• Multiple Protocol Support: ASCII, USS drive protocol, Modbus RTU, 3964(R)
• TIA Portal Integration: Simple configuration through STEP 7 Basic
• Industrial Grade: Robust design for demanding automation environments

Technical Specifications

• Interface: RS232 (V.24) with 9-pole D-sub pin connector (male)
• Protocol Support: Freeport, ASCII, Modbus RTU Master/Slave
• Dimensions: 30 × 100 × 75 mm (W × H × D)
• Weight: 0.152 kg
• Power Supply: 24V DC from CPU backplane (+5V DC, 200mA max)
• Power Consumption: 1.1W typical
• Cable Length: Maximum 10m point-to-point connection
• Telegram Length: Maximum 1 kbyte (Freeport)

Communication Capabilities

Supported Protocols:

• Freeport: User-defined message formats with configurable parameters
• ASCII: Interface handshake signals controlled via user program
• Modbus RTU: Master and slave functionality for industrial networks
• USS Drive Protocol: Communication with Siemens drives
• 3964(R): Standard industrial communication protocol

Configuration Options:

• Configurable baud rates and data formats
• Selectable data bits, parity, and stop bits
• Hardware and software flow control
• Interrupt-driven and polling communication modes

Applications & Integration

Primary Applications:

• Legacy system integration with existing RS232 devices
• Industrial device communication (sensors, drives, instruments)
• Data collection from serial-based equipment
• SCADA system connectivity and monitoring
• Process control and automation systems

System Compatibility:

• All SIMATIC S7-1200 CPU series (1211C, 1212C, 1214C, 1215C, 1217C)
• TIA Portal programming with STEP 7 Basic
• Direct installation in communication module slot
• Front-accessible connector for easy wiring

Installation & Configuration

• Module Installation: Plugs directly into S7-1200 communication slot
• Connector Type: 9-pole D-sub male for industry-standard connections
• Cable Requirements: Standard RS232 cable (10m maximum length)
• Programming: Configure through TIA Portal hardware configuration
• Function Libraries: Pre-built communication function blocks available

Quality & Compliance

• Status: Active Product (PM300)
• Origin: China | EAN: 6940408102095 | UPC: 887621416294
• RoHS Compliant: Since 30.08.2013 | WEEE: Take-back obligation applies
• REACH: Contains lead, lead oxide, and BPA above 0.1% w/w (safe when used as intended)

Package Contents

• 1 × CM 1241 RS232 Communication Module
• Technical documentation and installation guide

Download existing graphical data for this product:

• Technical Datasheet
• Product Information Page
• CM 1241 Product Family
• Technical Documentation
• Product Support Portal