SIEMENS SIMATIC S5 6ES5948-3UA12

SIEMENS SIMATIC S5 6ES5948-3UA12 – Central Processor Unit CPU 948 for S5-155U

The Siemens SIMATIC S5 6ES5948-3UA12 is a high-capacity central processing unit (CPU 948) designed for the SIMATIC S5-155U programmable logic controller system. This advanced CPU module serves as the main processing unit in demanding industrial automation applications that require high performance, large memory capacity, and extensive communication capabilities.

The CPU 948 is intended for use in large and complex control systems. It supports advanced programming features and allows execution of multiple complex control routines simultaneously. The module is equipped with a large user memory area, suitable for storing extensive programs, data blocks, and diagnostics structures.

The unit features a built-in TTY (20 mA current loop) communication interface, enabling connection to programming devices and operator panels. It can also be expanded with additional communication processors for integration into wider industrial networks or distributed control environments.

Technical specifications:

• Model number: 6ES5948-3UA12

• CPU type: CPU 948

• PLC system: SIMATIC S5-155U

• User memory: High-capacity RAM (actual size depends on configuration)

• Power supply: Supplied via rack system

• Communication interface: TTY 20 mA interface for PG/OP

• Supported instruction sets: Standard and extended S5 instruction set

• Programming software: STEP 5

• Programming languages: STL, LAD, FBD

• Mounting: Rack-mounted (S5-155U standard slot)

• Dimensions: Standard for CPU modules in 155U series

• Weight: Approx. 1.2 kg

• Operating conditions: Industrial standard temperature and humidity range

The CPU 948 supports structured programming and enables rapid cycle execution, making it suitable for process automation, high-volume manufacturing, and continuous production lines. It supports diagnostics and status monitoring features, improving system transparency and simplifying troubleshooting and maintenance.

Its design ensures compatibility with a wide range of I/O modules and communication processors within the SIMATIC S5 family. The unit can be integrated into distributed systems where fast and reliable control is critical.

Although the 6ES5948-3UA12 has been officially discontinued, it remains in active use in many industrial facilities that continue to operate legacy S5-155U systems. The module is valued for its long-term stability, predictable performance, and integration flexibility.