SIEMENS 6ES5945-7UA13

Siemens SIMATIC S5 CPU 945 Central Processing Unit

Description

The 6ES5945-7UA13 is a CPU 945 central processing unit module for the proven Siemens SIMATIC S5-115U programmable logic controller system. This module serves as the core of the automation system, executing user programs and managing all connected I/O and communication modules. It is an essential component for maintaining and repairing legacy S5-115U installations across various industries.

Specifications

• Manufacturer: Siemens
• Product Line: SIMATIC S5
• System Compatibility: S5-115U
• Model: CPU 945
• Part Number: 6ES5 945-7UA13
• Communication Ports: Integrated ports for programming and communication (TTY/V.24)

Label Info

• MLFB: 1P 6ES5 945-7UA13
• Serial Number: SC-K4K01114
• Hardware Version (E-Stand): 02

Application

This CPU is ideal for spare parts inventory or as a direct replacement for a failed unit in existing S5-115U controlled machinery. It helps to extend the life of valuable production equipment without the need for a complete and costly system migration.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this pre-owned CPU module, you are actively participating in the circular economy. The reuse of this component avoids the production of a new one, saving an estimated 48 kg of CO2 – comparable to the emissions of driving a car for 240 km.

Availability

This is an obsolete item but available from our stock. Order now from spareparts2day for expert support and fast delivery.

FAQ

Can I replace a different S5-115U CPU, like a CPU 943, with this CPU 945?

While both are for the S5-115U system, the CPU 945 is a more powerful processor with different memory and performance characteristics. Direct replacement may be possible but requires careful checking of your existing program’s memory usage, cycle time requirements, and any special functions used. It’s crucial to consult the S5 technical manuals and adapt the program if necessary.

What software is needed to program this CPU 945?

This CPU is programmed using Siemens STEP 5 software. Modern engineering software like TIA Portal is not compatible with the SIMATIC S5 series. You will also need a specific programming cable to connect your programming device (PG) to the DB15 port on the front of the module.

Does this CPU module require an external memory module to operate?

The CPU 945 has internal RAM for the user program, but for non-volatile storage (to retain the program after power loss), it requires a memory submodule (EPROM or EEPROM). This submodule plugs into the slot under the flap on the front of the CPU. Ensure you have a compatible memory module with your program loaded onto it.

Current Date: March 13, 2026

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