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Communication Interface Overview
The Siemens 6ES7441-1AA00-0AE0 operates as a dedicated communications module for the SIMATIC S7-400 programmable logic controller. This module handles serial data exchange between the PLC and external devices. It supports multiple protocols for flexible connectivity to various field equipment. Automation engineers use this module for integrating barcode readers, printers, and other serial peripherals.
Technical Specifications
The 6ES7441-1AA00-0AE0 measures 290 mm in height and 50 mm in width. Its single-slot form factor fits standard S7-400 rack configurations. The module weighs approximately 0.7 kilograms. It draws 650 mA from the +5V DC and 20 mA from the 24V DC backplane supplies.
| Parameter | Specification |
|---|---|
| Model | 6ES7441-1AA00-0AE0 |
| Product Type | Communications Module |
| Dimensions | 290 mm x 50 mm x 150 mm (depth) |
| Weight | ~0.7 kg |
| Supply Voltages | +5V DC (650 mA), 24V DC (20 mA) |
| Communication Ports | 2 x RS-232 (9-pin D-sub), 1 x RS-422/485 (15-pin D-sub) |
| Protocols | ASCII, 3964R, RK512, Modbus RTU |
| Baud Rate | Up to 115.2 kbps |
| Data Format | 7/8 data bits, 1/2 stop bits, parity selectable |
| Buffer Memory | 64 KB for receive, 64 KB for transmit |
| On-board Components | 1 x microcontroller, 3 x UARTs, 1 x Flash EPROM |
| Energy Storage | 22 μF tantalum capacitor |
| LED Indicators | 4 x Status (PWR, RUN, SF, COM) |
| Operating Temp. | 0°C to +60°C |
Protocol Support and Communication Flexibility
This module supports ASCII, 3964R, RK512, and Modbus RTU protocols. The ASCII protocol enables connection to barcode readers and printers. 3964R provides a reliable point-to-point link with error checking. RK512 supports communication with older Siemens systems. Modbus RTU allows integration with third-party field devices. Each port operates independently with its own protocol setting.
Interface Connectivity
The Siemens 6ES7441-1AA00-0AE0 offers two RS-232 ports and one RS-422/485 port. A 9-pin D-sub connector handles each RS-232 interface for standard PC connectivity. The 15-pin D-sub connector supports RS-422 for long-distance transmission. Each port includes a dedicated UART for simultaneous communication. This flexibility accommodates diverse peripheral devices.
Data Handling and Buffer Management
This communications module features 64 KB of receive buffer and 64 KB of transmit buffer. The large buffer capacity prevents data loss during high-speed communications. The module handles data framing and protocol conversion automatically. It transfers data to the CPU via the S7-400 backplane. The microcontroller manages all buffer operations efficiently.
Installation and Configuration
Installing the 6ES7441-1AA00-0AE0 requires one slot in the S7-400 rack. The module connects to the backplane via its edge connector. You must configure the communication parameters through STEP 7 software. The software provides a user-friendly interface for protocol selection. The module operates reliably between 0°C and 60°C ambient temperatures. Proper shielding of communication cables ensures error-free transmission.
Reliability and Diagnostics
The Siemens 6ES7441-1AA00-0AE0 delivers robust communication performance in industrial settings. Four LED indicators show power, run, fault, and communication activity. The module performs self-diagnostics during startup and operation. Regular monitoring of the COM LED confirms active data exchange. The module supports firmware updates via the serial interface.