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Module Overview
This interface module connects SIMATIC S5 controllers to external field devices. You can install Siemens 6ES5255-3AA11 directly into S5 series PLC racks. The unit handles data exchange between the CPU and remote I/O stations. It supports both analog and digital signal transfer through a single cable.
Technical Specifications
| Parameter | Value |
|---|---|
| Dimensions (W x H x D) | 250 mm x 25 mm x 130 mm |
| Weight | 0.45 kg |
| Communication protocol | Siemens S5-specific (3964R) |
| Interface type | RS-485, 15-pin D-sub connector |
| Maximum cable length | 1000 meters (shielded twisted pair) |
| Transmission rate | 9600 baud to 115200 baud |
| Supported I/O | Up to 128 digital or 32 analog points |
| Status indicators | 4 LEDs (power, data exchange, error) |
| Interface to backplane | S5 6ES5 backplane connector |
| Total onboard components | 135 discrete parts |
| Energy storage type | Ceramic and tantalum capacitors |
| Energy storage rating | 220 µF at 20V DC |
| Operating temperature | 0°C to +60°C |
Board Layout and Components
The PCB places the communication processor at the center of the board. A 15-pin D-sub connector mounts on the front panel for field cabling. Moreover, 135 discrete components include line drivers and isolation circuits. Tantalum capacitors filter noise on all internal power rails. Consequently, data transmission remains stable across long network distances.
Installation Process
You can mount Siemens 6ES5255-3AA11 into any standard SIMATIC S5 rack slot. The backplane connector supplies power and exchanges data with the CPU. Furthermore, the front panel D-sub port connects to remote I/O stations directly. DIP switches allow configuration of baud rate and station address easily.
Performance Advantages
This module supports cable runs up to 1000 meters between stations. The built-in 3964R protocol handles error checking automatically. Therefore, remote I/O operates reliably without data corruption. The module also offloads all communication tasks from the main S5 processor.
Safety and Compliance
Siemens 6ES5255-3AA11 meets CE and RoHS industrial standards. The board discharges stored energy below 3V within five seconds. Hence, technicians face minimal electrical risk during installation or replacement.