Siemens 6ES5925-5AA12 Reliable CPU Module

The Siemens 6ES5925-5AA12 reliable CPU module serves as the central processor for SIMATIC S5-115U systems. This module executes user logic, processes I/O data, and manages system diagnostics. It mounts directly into any S5-115U rack slot (typically slot 1). You can use this module as a direct replacement for failed processor units.

Detailed Technical Specifications

The Siemens 6ES5925-5AA12 reliable CPU module measures 250 mm in length. Its width reaches 160 mm across the main body. The total height goes up to 48 mm with all components installed. This unit weighs approximately 0.72 kilograms for secure mounting.

Key hardware parameters include:

• Complete Model: Siemens 6ES5925-5AA12

• Component count: 118 individual electronic parts

• Connector ports: One 20-pin screw terminal block

• Energy storage: Six aluminum capacitors (220 µF each)

• Mounting system: Two rear locking levers

• PCB layers: Six-layer industrial construction

• Processor type: 16-bit Intel 80186 compatible

• User memory: 32 KB RAM (battery-backed)

• Program memory: 32 KB EPROM/EEPROM

• Processing speed: 1.5 ms per 1K statements

• Digital I/O capacity: 512 inputs and 512 outputs

• Timer/counter count: 128 each (built-in)

• Diagnostics: 8 LED status indicators

The Siemens 6ES5925-5AA12 reliable CPU module stores moderate residual charge after power-off. Therefore, technicians must wait thirty seconds before handling the module. The CPU requires a backup battery for RAM retention during power loss. Moreover, the module includes a watchdog timer for automatic system reset on fault.

Application and Installation

The Siemens 6ES5925-5AA12 reliable CPU module slots into the first slot of any S5-115U rack. It requires an external 24 V DC supply for backplane operation. This module runs STEP 5 programs written in statement list or ladder logic. Consequently, you can control medium-sized automation tasks with this single processor.

Reliability and Diagnostics

This module performs cyclic self-tests for memory and I/O integrity. The Siemens 6ES5925-5AA12 includes a real-time clock for time-stamping fault events. You can access diagnostic data through the front-panel LEDs or programming device. Therefore, troubleshooting system faults becomes faster and more efficient.

Always power down the rack before inserting or removing this module. Replace the backup battery every two years for continuous data retention. The module features a removable EPROM submodule for program updates. Furthermore, its conformal coating protects against dust and light moisture.