6ES7441-2AA04-0AE0 SIMATIC S7-400 Serial Comm | RS232/422/485

Product Overview

• Siemens 6ES7441-2AA04-0AE0 – CP 441-2 communications module for SIMATIC S7-400
  • 2 independent point‑to‑point communication channels
  • Supports RS232, RS422/485, and 20 mA (TTY) interfaces
  • Maximum transmission speed of 115.2 kbit/s
  • Includes configuration package on CD

Technical Specifications

• General data
  • Brand: Siemens
  • Model: 6ES7441-2AA04-0AE0
  • Series: SIMATIC S7-400
  • Product type: Communications module (CP 441-2)
  • Weight: approx. 720 g (including interface module: 100 g)
• Power supply
  • Rated voltage: 5 V DC and 24 V DC
  • Backplane current (5 V): max. 600 mA (without interface module)
  • Interface module consumption: 300 mA @ 5 V (all types)
  • 20 mA (TTY) additionally: 45 mA @ 24 V
  • Power loss: typ. 0.3 W
• Interfaces & connectivity
  • Number of interfaces: 2 (variable, user‑selectable)
  • Supported physical interfaces:
    • RS232 (V.24) – cable length: max. 10 m
    • RS422/485 (X.27) – cable length: max. 1200 m
    • 20 mA (TTY) – cable length: max. 1000 m
  • Transmission rate: up to 115.2 kbit/s (distributed across both interfaces)
• Protocol drivers
  • Integrated protocols:
    • 3964 (R) – standard Siemens protocol
    • ASCII – for third‑party devices
    • RK512 – for remote communication
    • Printer driver – supports HP/IBM printers
  • Custom drivers: reloadable via memory card
  • Memory requirements per interface:
    • Parameters: 1‑5 KB
    • Message texts: 0‑55 KB
    • Loadable drivers: 0‑64 KB
• Transmission speeds by interface
  • 20 mA (TTY): max. 19.2 kbit/s (all protocols)
  • RS422/485: max. 115.2 kbit/s (all protocols)
  • RS232: max. 115.2 kbit/s (all protocols)
• Configuration & dimensions
  • Configuration software: STEP 7 (with own parameter assignment forms)
  • Dimensions: 25 × 290 × 210 mm

Expert Review

• This module provides flexible serial connectivity for S7-400 systems.
• Two independent channels allow connection to different devices simultaneously.
• Support for RS232, RS422/485, and 20 mA covers most legacy equipment.
• The 115.2 kbit/s speed handles most industrial communication needs.
• Reloadable drivers make this module adaptable to custom protocols.

Manager’s Insight

• Choose this module when you need to connect printers or third‑party serial devices.
• The 3964 (R) protocol works well with Siemens drives and HMIs.
• ASCII protocol allows easy integration with barcode scanners and weigh scales.
• Consider cable length limits when planning your installation layout.

Suitable Applications & Compatible Systems

• Compatible systems
  • SIMATIC S7-400 PLC systems (all CPUs)
  • S7-400 racks and power supplies
  • Third‑party devices with serial interfaces
• Typical applications
  • Printer connection for batch reporting and label printing
  • Barcode scanner integration in logistics systems
  • Weigh scale communication in process control
  • Legacy device connection with RS232 or 20 mA interfaces
  • Remote I/O communication using RK512 protocol

Installation Guide

• Mounting steps
  • Insert the module into a free S7‑400 slot
  • Attach the appropriate interface module (sold separately)
  • Connect the serial cable to the interface module
  • Set the interface parameters in STEP 7 hardware configuration
• Configuration tips
  • Select the correct protocol (3964, ASCII, RK512, or Printer)
  • Set baud rate matching the connected device
  • Configure message texts for printer output if needed
  • Load custom drivers via memory card for special applications

Maintenance & Debugging

• Check cable connections first when communication fails
• Verify baud rate and parity match the remote device
• Monitor diagnostic buffer in STEP 7 for error messages
• Keep interface module contacts clean and free of dust

Comparison with Similar Models

• Compare with 6ES7441-1AA00-0AE0 (CP 441-1, single channel, fewer protocols)
• Compare with 6ES7441-2AA04-0AE0 (this model, 2 channels, full protocol set)
• Compare with 6ES7441-2AA05-0AE0 (newer version with enhanced features)

Package Contents & Warranty

• Package includes
  • 1x Siemens 6ES7441-2AA04-0AE0 communications module
  • 1x configuration package on CD
  • 1x product documentation (digital download)
  • 1x warranty card (12 months)
• Shipping & warranty
  • 12‑month warranty against manufacturing defects
  • Express shipping via FedEx, UPS, or DHL
  • 12‑24 hour dispatch for in-stock items

Frequently Asked Questions

• Q: What interface modules work with this CP 441-2 module?
  • A: This module accepts RS232, RS422/485, or 20 mA (TTY) interface modules. You need to purchase them separately.
• Q: Can I use both channels simultaneously at full speed?
  • A: Yes, both channels work independently. The 115.2 kbit/s speed distributes across both interfaces.
• Q: How do I load a custom protocol driver?
  • A: Save the driver file to the S7‑400 memory card. Then use STEP 7 to load it into the module.
• Q: Does this module support Modbus protocol?
  • A: Not directly. You can use the ASCII driver to implement Modbus RTU with custom logic in the PLC program.
• Q: What is the maximum cable length for RS232?
  • A: RS232 cables are limited to 10 m. For longer distances, use RS422/485 (1200 m) or 20 mA (1000 m).

Buying Guide & Selection Tips

• Choose this 2‑channel CP 441-2 for flexible serial connectivity.
• For single‑channel applications, the CP 441-1 may be more cost‑effective.
• Select RS232 for short‑distance connections to printers and HMIs.
• Use RS422/485 for longer distances up to 1200 m.
• Verify the connected device’s protocol before ordering.

Contact & Support

• Email: sales@powergearx.com
• WhatsApp: +86 18030005825 (click to chat)
• 24/7 technical support for installation and troubleshooting

Copyright © 2026 Powergear X Automation Limited. All rights reserved.
Original Source: https://www.powergearx.com/