SIEMENS SIMATIC S5 6ES5946-3UA22

SIEMENS SIMATIC S5 6ES5946-3UA22 – Central Processor Unit CPU 946 for S5-155U

The Siemens SIMATIC S5 6ES5946-3UA22 is a high-performance central processing unit designed for the SIMATIC S5-155U programmable logic controller system. Identified as CPU 946, this module is intended for advanced control tasks in complex industrial automation environments that require extensive program capacity, high processing speed, and robust communication capabilities.

The CPU 946 provides a large user memory area for storing control programs and data blocks. It supports advanced programming structures and multitasking operations, making it suitable for process automation, high-speed manufacturing systems, and large-scale control architectures.

This CPU includes multiple communication interfaces, including programmable device (PG) and operator panel (OP) connectivity via a 20 mA current loop (TTY) interface. The unit supports integration into distributed systems and can communicate with other SIMATIC S5 CPUs and remote I/O stations using additional communication modules.

Technical specifications:

• Model: 6ES5946-3UA22

• CPU type: CPU 946

• System: SIMATIC S5-155U

• User memory: Large internal RAM (specific size depending on configuration)

• Power supply: Supplied via S5 rack system

• Communication: TTY 20 mA interface for PG/OP

• Expansion: Supports multiple I/O modules and communication processors

• Mounting: Installed in S5-155U rack

• Programming software: STEP 5

• Supported languages: STL, LAD, FBD

• Dimensions: Standard CPU form factor for 155U

• Weight: Approx. 1.0 kg

• Operating temperature: Industrial standard range

The CPU supports various standard and extended instruction sets. It enables complex logic control, data handling, and time-critical operations. With support for diagnostic functions and error handling, it ensures high availability and maintainability in mission-critical applications.

The 6ES5946-3UA22 is widely used in industries such as power generation, chemical processing, automotive production, and large-scale material handling systems. Its reliability and flexibility made it a preferred choice in demanding environments before being discontinued.

Although no longer in production, this module remains a critical component in existing installations. Facilities operating legacy S5-155U systems continue to rely on the CPU 946 for stable control and long-term system operation.