Product Overview
When point-to-point communication failures cause production line downtime, the Siemens 6ES7441-2AA03-0AE0 delivers reliable connectivity for S7-400 systems. This SIMATIC CP 441-2 communications module supports two variable channels with multiple physical interfaces (20 mA TTY, RS 232C, RS 422/485) and integrated protocol drivers including 3964(R), ASCII, RK512, and reloadable customer-specific drivers. It helps operators overcome distance limitations and protocol mismatches in industrial environments.
Technical Specifications
The 6ES7441-2AA03-0AE0 operates from a 5 V DC backplane bus with a maximum input current of 700 mA (without interface module). Interface modules draw up to 300 mA at 5 V (300 mA for RS 232C/RS 422/485; 300 mA at 5 V and 45 mA at 24 V for 20 mA TTY). Memory requirements per interface on the S7-CPU memory card range from 1 to 5 KB for parameters, 0 to 55 KB for message texts, and 0 to 64 KB for loadable drivers. Cable lengths achieve up to 1,000 m for 20 mA TTY, 10 m for RS 232, and 1,200 m for RS 422/485 (all shielded). The module supports a maximum transmission rate of 115.2 kbit/s distributed across both interfaces.
Transmission rates vary by protocol: with RS 422/485 and RS 232, 3964(R)/ASCII/Printer/RK512 protocols reach up to 115.2 kbit/s; with 20 mA TTY, they reach up to 19.2 kbit/s. The module supports S7 extended communication and a total of 8 connections. Configuration is via STEP 7 with own parameter assignment forms. Dimensions are 25 mm width, 290 mm height, 210 mm depth; weight is approximately 720 g (interface module: 100 g).
Compatibility & Integration
The 6ES7441-2AA03-0AE0 integrates seamlessly into SIMATIC S7-400 racks. It communicates with S7 CPUs using S7 extended communication and supports up to 8 simultaneous connections. The module works with a variety of protocol drivers: 3964(R), ASCII, RK512, printer drivers for HP DeskJet/LaserJet and IBM Proprinter, and customer-specific drivers that can be reloaded. Its two variable interfaces allow connection to different serial devices without additional hardware.
Installation & Setup Guidance
Install the 6ES7441-2AA03-0AE0 into any free slot of an S7-400 rack. Use the appropriate interface module (20 mA TTY, RS 232C, or RS 422/485) to match your serial devices. Ensure shielded cables to minimize noise, especially for longer distances (max 1,000 m for TTY, 1,200 m for RS 422/485). Configure the module via STEP 7 using the provided parameter assignment forms on CD. Set transmission rates and protocol settings per channel as needed.
Troubleshooting Common Issues
Serial communication issues often stem from incorrect protocol selection or grounding problems. The 6ES7441-2AA03-0AE0 avoids these by supporting multiple protocols and allowing driver reloading. If communication fails, verify cable length does not exceed the shielded maximum (e.g., RS 232 limited to 10 m). Check that the interface module matches the device (TTY requires 20 mA current loop). Use the STEP 7 configuration to confirm correct parameter settings. If memory errors occur, ensure the S7-CPU memory card has sufficient capacity (up to 64 KB for drivers).
Buying Guide & Selection Advice
When purchasing the 6ES7441-2AA03-0AE0, verify that your S7-400 system supports CP 441-2 modules and that you have the required interface modules (sold separately). Confirm the protocol drivers needed for your application: 3964(R), ASCII, RK512, printer, or custom. For best reliability, order from a trusted supplier. PLC Source PRO (ubest101) offers this module with fast shipping and genuine Siemens parts. Contact us for quantity discounts or custom driver support.