Advanced Dual-Channel Serial Communication Processor

Maximize connectivity for your S7-400 system. The Siemens 6ES7441-2AA03-0AE0 CP 441-2 module provides two fully independent serial channels. Connect to printers, scanners, drives, or other PLCs using RS232, RS422, RS485, or 20mA TTY interfaces. It includes powerful protocols and a configuration package for ultimate flexibility.

Why This Module Is the Best Choice

Ultimate Interface Flexibility: Each channel can be fitted with a different interface module (RS232, RS422/485, or 20mA TTY) to match any device.

Professional Protocol Suite: Built-in support for 3964(R), ASCII, RK512, and printer drivers for direct connection to HP/IBM printers.

High-Speed Performance: Achieves data rates up to 115.2 kbit/s on RS232/422/485 interfaces for fast data transfer.

Expandable Functionality: Load custom drivers for proprietary or special communication protocols, future-proofing your investment.

Complete Technical Specifications

Manufacturer: Siemens

System Family: SIMATIC S7-400

Module Designation: Communications Processor CP 441-2

Complete Part Code: 6ES7441-2AA03-0AE0

Communication Channels: 2 (configurable with plug-in interface submodules)

Available Interfaces: RS232C (V.24), RS422/485 (X.27), 20mA TTY

Maximum Cable Length: RS485/422: 1200m; 20mA TTY: 1000m; RS232: 10m

Maximum Baud Rate: 115.2 kbit/s (RS232/422/485); 19.2 kbit/s (20mA TTY)

Integrated Protocols: 3964(R), ASCII, RK512, Printer Driver (HP, IBM)

Custom Drivers: Yes, loadable via memory card

Total Connections: Up to 8

PLC Memory Usage: 1-5 KB for parameters + space for drivers/texts

Power from Backplane: 5V DC, max. 700 mA (base module)

Configuration Tool: Integrated in Siemens STEP 7 software

Package Contents: CP 441-2 base module and configuration CD

Module Dimensions: 25 mm (W) x 290 mm (H) x 210 mm (D)

Total Weight: Approx. 720 g (module + interface submodules)

Installation & Setup Guide

Install the base module in your S7-400 rack. Choose and attach the required interface submodules (sold separately) for each channel—for example, one RS232 and one RS485. Configure each channel independently in STEP 7, selecting the physical interface, protocol, baud rate, and data format. Use shielded cables appropriate for the interface type and distance.

Warranty & Shipping

This product is covered by our standard 12-month warranty. We ship promptly worldwide using FedEx, UPS, or DHL.

Professional FAQs

Q: What interface submodules do I need to buy separately?

A: You must purchase interface submodules like the 6ES7964-1AA04-0AA0 (RS232) or 6ES7964-1AB04-0AA0 (RS422/485). The base module alone has no physical ports.

Q: What is the RK512 protocol used for?

A: RK512 is a Siemens-specific protocol for efficient data exchange between Siemens PLCs (like S5 and S7), often used in older or complex automation networks.

Q: Can I connect two different devices with different protocols at the same time?

A> Absolutely. That's the key advantage. You could have Channel 1 talking ASCII to a printer via RS232, and Channel 2 using 3964(R) to a drive via RS485, simultaneously.

Q: What does "loadable driver" capability mean?

A> It allows you to load special communication firmware (e.g., for a non-standard device protocol) from a memory card into the module, enabling communication without changing hardware.

Q: Is this a point-to-point or network module?

A: It is primarily for point-to-point connections on each channel. However, the RS422/485 interface can potentially be used in multi-drop configurations depending on the protocol and device support.

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