This processor module serves as the central intelligence for Siemens SIMATIC S5 programmable logic controllers. It executes user programs and manages all system I/O operations efficiently. We engineered the Siemens 6ES5921-3UA11 for the S5-115U series automation platform. This module handles complex logic sequences and mathematical calculations rapidly. It ensures deterministic scan cycles for reliable real-time process responses. Therefore, your automated processes maintain precise timing and accurate execution.
Physical Configuration and System Integration
The Siemens 6ES5921-3UA11 features a modular form factor for the S5 rack mounting system. Its dimensions measure 233.0 mm in height, 25.0 mm in width, and 160.0 mm in depth. The module weighs approximately 0.55 kilograms for straightforward installation procedures. This unit occupies a single slot within the S5-115U chassis. It connects to the system backplane via the standard Eurocard connector. The processor includes status LEDs for operational monitoring and diagnostics.
Processing Capabilities and Memory Architecture
This processor module operates with a 16-bit CPU architecture for efficient instruction execution. It handles up to 1024 digital inputs and 1024 digital outputs directly. The Siemens 6ES5921-3UA11 provides 16 KB of user memory for program and data storage. It utilizes internal RAM with battery backup to preserve program integrity. The module supports STEP 5 programming language with ladder and statement list options. It includes a built-in real-time clock for time-based control functions. Consequently, this offers comprehensive processing power for medium-scale automation applications.
Detailed Technical Specifications and Interface Details
We outline the module’s comprehensive technical parameters and operational capabilities below.
| Specification | Detail |
|---|---|
| Part Number | Siemens 6ES5921-3UA11 |
| Product Category | Processor Module |
| Dimensions (H x W x D) | 233.0 mm x 25.0 mm x 160.0 mm |
| Module Weight | Approximately 0.55 kg (1.21 lbs) |
| Rack Slot Requirement | 1 slot (S5-115U chassis) |
| CPU Architecture | 16-bit processor |
| User Memory | 16 KB RAM (battery-backed) |
| Memory Backup | 3.6 V NiCd battery (replaceable) |
| Programming Language | STEP 5 (ladder, statement list, function block) |
| Program Execution | Cyclic, time-controlled, interrupt-driven |
| Maximum I/O Capacity | 1024 digital inputs / 1024 digital outputs |
| Bit Processing Time | 1.6 µs per bit operation |
| Word Processing Time | 5.4 µs per 16-bit word operation |
| Integrated Functions | Real-time clock, watchdog timer |
| Diagnostic Indicators | RUN, STOP, FAULT status LEDs |
| Serial Interface | TTY port (20 mA) for programming device connection |
| Backplane Interface | Eurocard connector (96-pin) |
| Power Supply Voltage | 5 VDC from backplane |
| Power Consumption | 1.5 W typical |
| Battery Backup Duration | Approximately 150 days minimum |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | -40°C to 70°C (-40°F to 158°F) |
| Compliance | CE, UL, CSA |
Details
| Weight | 0.55 kg |
|---|---|
| Dimensions | 233 × 25 × 160 mm |
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