Siemens 6ES5948-3UA11
Siemens 6ES5948-3UA11
Siemens 6ES5948-3UA11
Siemens 6ES5948-3UA11
Siemens 6ES5948-3UA11
Siemens 6ES5948-3UA11
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6ES5948-3UA11

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The Siemens 6ES5948-3UA11 is a high-performance CPU 948 module designed for SIMATIC S5-135U/155U PLC systems, featuring a 640 KB RAM capacity and 0.05 µs binary instruction time for demanding industrial automation.
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Technical specifications for 6ES5948-3UA11

  • Manufacturer:
    Siemens
  • Part Number:
    6ES5948-3UA11
  • Product Family:
    Siemens Simatic S5
  • Product Type:
    CPU Module
  • Memory Capacity:
    640 KB RAM (Internal)
  • Instruction Time:
    Approx. 0.05 µs (Binary)
  • Power Consumption:
    Approx. 18W from 5V DC bus
  • Programming Language:
    STEP 5
  • Weight:
    0.865 kg
  • Estimated shipping dimensions:
    4.1x20.2x25.5cm
  • Tariff Code:
    8517795000
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Application Diagnostics & Protection Installation

Features:

  • Provides massive storage for complex user programs and data blocks.
  • Delivers binary instruction processing at approximately 0.05 µs for real-time control.
  • Supports operation in the S5-135U/155U racks alongside other CPUs for distributed task management.
The expansive 640 KB RAM capacity of the 6ES5948-3UA11 represents a significant milestone for the S5 family, allowing engineers to implement highly detailed logic sequences without fear of memory exhaustion. This feature is particularly crucial for complex process industries, such as petroleum refining or large-scale automotive assembly, where thousands of data points must be tracked simultaneously.

In the realm of precision manufacturing, the speed of logic execution can determine the overall quality of the finished product. The 6ES5948-3UA11 excels here, offering an incredible binary processing speed of 0.05 microseconds. This rapid response time allows the controller to react almost instantaneously to sensor inputs, making it ideal for motion control and high-speed synchronized tasks.

The 6ES5948-3UA11 is designed to thrive in the modular environment of the S5-135U and 155U racks, where it can operate as a standalone processor or as part of a multi-processor configuration. This interoperability allows for the segmentation of control tasks, where one CPU might handle motion control while another manages HMI data and logging.

The 6ES5948-3UA11 Siemens CPU Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL)by the manufacturer (OEM).

Siemens 6ES5948-3UA11 CPU Module Manuals, Datasheets,Drivers,Link Important Notice:Other accessories,manuals,cables,calibration data,software,etc.are not included with this equipment unless listed in the above stock item description.All prices are shown in USD.
Siemens 6ES5948-3UA11 CPU Module Specs

General

  • Manufacturer Siemens
  • Model 6ES5948-3UA11
  • Condition New Original ready stock
  • Product Family 6ES5948-3UA12,6ES5948-3UA21,6ES5947-3UA11
Important Notice:Other accessories,manuals,cables,calibration data,software,etc.are not included with this equipment unless listed in the above stock item description.All prices are shown in USD.
  • Automotive Manufacturing: Coordinating high-speed assembly lines and robotic synchronization requiring rapid cycle times.
  • Chemical and Process Industry: Managing complex PID control loops and extensive data logging for chemical batching and refineries.
  • Power Plants: Controlling balance-of-plant (BOP) systems and monitoring thousands of digital/analog I/O points in real-time.
  • Steel and Heavy Machinery: Operating rolling mills and furnace controls where deterministic logic execution is critical for safety and quality.
  • System Status LEDs: Features front-panel indicators for RUN, STOP, and BASP (Output Inhibit). A red STP LED indicates a CPU transition to stop due to an error, while the BASP LED signals that all digital outputs have been de-energized for safety.
  • Error Interrupts (OBs): The module utilizes Organization Blocks (e.g., OB121/OB122) to handle programming or I/O access errors. This allows the system to attempt a controlled recovery or safe shutdown rather than an immediate hard crash.
  • Hardware Watchdog: An internal "Watchdog" timer monitors the software scan cycle. If the program execution exceeds a predefined time limit (indicating a loop or hang), the 6ES5948-3UA11 automatically triggers a system stop.
  • Memory Protection: Since the 640 KB memory is RAM-based, the module relies on the power supply's lithium battery. It performs a checksum on startup to ensure program code has not been corrupted during power-down.
  • Mechanical Installation: The module must be inserted into the designated CPU slots of the S5-135U/155U subrack. It is NOT hot-swappable; the rack power supply must be switched off before insertion or removal to prevent bus damage.
  • Memory Management: When upgrading from a lower-tier CPU (like a CPU 944), ensure the STEP 5 program is reconfigured for the CPU 948's expanded memory map and instruction set. You may need to adjust the DB (Data Block) addressing to utilize the full 640 KB.
  • Heat Dissipation: Due to its high processing power, the module generates significant heat (approx. 18W). Ensure the subrack's fan units are fully operational and the air filters are clean to prevent thermal throttling or hardware failure.
Description
The Siemens 6ES5948-3UA11 acts as a powerful central processor for legacy SIMATIC S5-135U and S5-155U controllers, managing high data volumes and complex control logic for long-term operational stability. 

It enhances systems requiring fast cycle times, providing a 640 KB RAM buffer that supports advanced, large-scale software applications and sophisticated PID control routines. Built to withstand harsh industrial environments, the 6ES5948-3UA11 offers high-speed arithmetic operations and efficient, reliable processing for critical, time-sensitive machinery. 

The 6ES5948-3UA11 ensures maximum uptime for existing S5 architecture by facilitating modern processing requirements in a legacy framework.
Alternative Names
6ES5948-3UA12 6ES5948-3UA21 6ES5947-3UA11 6ES5946-3UA11
Technical notes
Ensure the 6ES5948-3UA11 is fully seated in the subrack to prevent bus communication errors during high-vibration operation.The 640 KB RAM is divided between user programs and data blocks; proper memory management in Step 5 is required to optimize 6ES5948-3UA11 performance.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Can I use the 6ES5948-3UA11 to replace a smaller CPU 946/947?
Yes, it is often used as an upgrade due to its superior 640 KB RAM. However, you must verify that your Step 5 program is configured for the CPU 948 instruction set and check if the current rack power supply can handle the 18W consumption.
How does the 0.05 µs execution speed benefit my old S5-155U system?
The ultra-fast binary instruction time of the 6ES5948-3UA11 drastically reduces scan cycle times. This is vital for high-speed packaging or chemical mixing where millisecond delays in logic execution can lead to product defects or safety hazards.
What is the battery backup requirement for the 6ES5948-3UA11 memory?
Since the 6ES5948-3UA11 utilizes volatile RAM to store its 640 KB of data, a healthy lithium battery in the S5 power supply module is required. Without it, a power cycle will result in a total loss of the program and configuration.
s the 6ES5948-3UA11 compatible with modern PG/PC programming units?
It communicates via the standard S5 TTY interface. You can use modern PCs running Step 5 software or TIA Portal (for migration analysis) via a specialized RS232-to-TTY or USB-to-TTY converter cable designed for the CPU 948.

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