This central processing unit delivers powerful control capabilities for demanding industrial automation tasks. It executes complex user programs with exceptional speed and precision. We engineered the Siemens 6ES5948-3UA23 as the flagship CPU for the SIMATIC S5-135U and S5-155U systems. This processor handles large-scale I/O configurations and sophisticated control algorithms. It ensures deterministic cycle times for time-critical process applications. Therefore, your automated systems achieve optimal performance and reliability.
Physical Configuration and System Integration
The Siemens 6ES5948-3UA23 features a double-width Eurocard form factor for S5 rack mounting. Its dimensions measure 233.0 mm in height, 50.0 mm in width, and 160.0 mm in depth. The CPU weighs approximately 0.85 kilograms for secure chassis installation. This unit occupies two adjacent slots in the S5-135U or S5-155U rack. It connects to the system backplane via a 96-pin Eurocard connector. The processor provides comprehensive status LEDs for operational monitoring.
Processing Power and Memory Architecture
This CPU operates with a powerful 16-bit microprocessor architecture. It delivers a bit instruction execution time of just 1.6 microseconds. The Siemens 6ES5948-3UA11 provides a substantial 48 KB of user memory for program storage. It includes integrated RAM with battery backup for reliable program retention. The processor supports STEP 5 programming with all language elements. It features a built-in real-time clock for scheduled control operations. Consequently, this offers exceptional processing capability for complex automation strategies.
Detailed Technical Specifications and Interface Details
We outline the CPU’s comprehensive technical parameters and operational capabilities below.
| Specification | Detail |
|---|---|
| Part Number | Siemens 6ES5948-3UA23 |
| Product Category | Central Processing Unit |
| Dimensions (H x W x D) | 233.0 mm x 50.0 mm x 160.0 mm |
| CPU Weight | Approximately 0.85 kg (1.87 lbs) |
| Rack Slot Requirement | 2 slots (S5-135U, S5-155U) |
| CPU Architecture | 16-bit microprocessor |
| User Memory | 48 KB RAM (battery-backed) |
| Memory Backup | 3.6 V NiCd battery (replaceable) |
| Programming Language | STEP 5 (ladder, statement list, function block, sequential) |
| Bit Instruction Time | 1.6 µs |
| Word Instruction Time | 5.4 µs (16-bit) |
| Maximum I/O Capacity | 4096 digital inputs / 4096 digital outputs |
| Maximum Analog I/O | 256 analog inputs / 256 analog outputs |
| Integrated Functions | Real-time clock, watchdog timer, interrupt processing |
| Diagnostic Indicators | RUN, STOP, FAULT, INTF, EXTF status LEDs |
| Serial Interface 1 | TTY port (20 mA) for programming device |
| Serial Interface 2 | RS-485 port (SINEC L1) |
| Backplane Interface | 96-pin Eurocard connector |
| Power Supply Voltage | 5 VDC from backplane |
| Power Consumption | 2.5 W typical |
| Battery Backup Duration | Approximately 200 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) |
| Applications | Complex automation, process control, large-scale systems |
| Compliance | CE, UL, CSA |
Details
| Weight | 0.85 kg |
|---|---|
| Dimensions | 233 × 50 × 160 mm |
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