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Product Overview
The Siemens 6ES5921-1AA21 CPU module serves as the central processing unit for SIMATIC S5-115U programmable controllers. This module executes user programs, processes I/O data, and manages communication tasks. It installs directly into standard S5 rack systems. The processor offers dependable control for medium-scale automation applications.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 6ES5921-1AA21 |
| Product Type | CPU Module |
| Brand | Siemens |
| Category | PLC CPUs |
| Compatibility | SIMATIC S5-115U |
| Memory Capacity | 8 KB (RAM) |
| Integrated I/O | 16 digital inputs / 16 digital outputs |
| Programming Language | STEP 5 |
| Weight | Approximately 0.35 kg |
| Dimensions | 233 mm x 25 mm x 158 mm (H x W x D) |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 70°C |
| Protection Class | IP20 |
Key Features and Benefits
Efficient Program Execution
The 6ES5921-1AA21 processes user logic rapidly and reliably. Its 8 KB memory capacity accommodates moderate-sized control programs. This performance ensures smooth and consistent machine operation.
Integrated I/O Connectivity
This CPU includes 16 onboard inputs and 16 onboard outputs. These integrated points reduce the need for additional I/O modules. Users can connect basic field devices directly to the controller.
Robust Industrial Construction
The module operates reliably within the 0°C to 60°C temperature range. Its rugged design withstands vibration and electrical noise. This durability ensures long service life in demanding environments.
Application and Use Cases
The Siemens 6ES5921-1AA21 suits conveyor systems, packaging machinery, and simple assembly lines. It also serves material handling and sorting applications. Maintenance teams will find this CPU a dependable spare for existing S5-115U installations.