Product Overview
The Siemens 6ES5946-3UA23 serves as the central processing unit for SIMATIC S5 control systems. This CPU executes user programs and manages all I/O operations effectively. It provides reliable automation control for legacy S5 installations worldwide. The unit fits directly into the S5 95U series compact chassis.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 6ES5946-3UA23 |
| Product Type | SIMATIC S5 CPU |
| Processor Type | 8-bit microcontroller |
| Program Memory | 16 KB RAM |
| Data Memory | 8 KB RAM |
| Integrated I/O | 16 digital inputs, 16 digital outputs |
| I/O Expansion | Up to 4 expansion modules |
| Execution Speed | 1.6 ms for 1K instructions |
| Timer/Counter | 128 timers, 128 counters |
| Communications | TTY interface (20 mA current loop) |
| Power Supply | 24 VDC external |
| Power Dissipation | 8.5 W typical |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | –40°C to 85°C |
Physical Dimensions and Mounting
This CPU module measures 215 mm in width, 45 mm in height, and 130 mm in depth. The unit weighs approximately 0.65 kg. It mounts onto a DIN rail or directly onto a panel plate. The front panel includes LED indicators for run, stop, and fault status. These LEDs provide immediate visual feedback on processor operation.
Processor Architecture and Memory
The 6ES5946-3UA23 employs an 8-bit microcontroller for industrial control processing. It stores user programs in 16 KB of RAM memory for program execution. The data memory capacity reaches 8 KB for storing variable values. The CPU includes 128 timers and 128 counters for timing and counting tasks. The execution speed of 1.6 ms per 1K instructions ensures responsive control performance.
Integrated I/O and Expansion Capabilities
This CPU comes with 16 digital inputs and 16 digital outputs built directly into the unit. You can expand the I/O capacity by adding up to 4 expansion modules. The expansion interface connects to additional S5 peripheral modules seamlessly. The digital inputs accept 24 VDC signals from field devices. The outputs drive loads up to 0.5 A per channel.
Installation and System Integration
You can install this CPU on a standard DIN rail inside the control cabinet. Secure the module with the integrated latch mechanisms on the rail. Connect the external 24 VDC power supply to the designated terminals. The TTY interface allows communication with programming devices and HMI panels. Always verify the supply voltage polarity before powering the system.
Environmental Compliance
This module carries CE marking and UL recognition for industrial use. It also complies with relevant EMC standards for industrial environments. The IP20 protection suits standard control cabinet installations.
Details
| Weight | 0.58 kg |
|---|---|
| Dimensions | 45 × 230 × 140 mm |
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