SIEMENS CPU 945 6ES5945-7UA23

Siemens SIMATIC S5 CPU 945 for S5-115U Systems

Description

This is the Siemens CPU 945, a central processing unit module for the SIMATIC S5-115U PLC family, with part number 6ES5945-7UA23. It is a powerful and reliable controller for medium-sized automation tasks. As a critical component of the S5 system, this CPU is ideal for spare parts inventory or for replacing a faulty unit in an existing installation, ensuring continued operation without the need for a full system upgrade.

Specifications

• Manufacturer: Siemens
• Product Family: SIMATIC S5
• System: S5-115U
• Module Type: Central Processing Unit (CPU)
• Model: CPU 945
• Part Number: 6ES5945-7UA23

Label Info

• Order Number: 6ES5 945-7UA23
• Serial Number: SC-K3A89190
• Hardware Version (E-Stand): 02

Application

Designed for controlling industrial processes in manufacturing, logistics, and process control. An essential component for companies maintaining machinery and plants that rely on the proven Siemens SIMATIC S5 platform.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this pre-owned module instead of a new one, you contribute to the circular economy and avoid the emission of approximately 32 kg of CO2, which is comparable to driving a car for 160 km.

Availability

This is an obsolete item, available as a refurbished spare part. Condition is used but tested for functionality. Order now from spareparts2day for expert support and fast delivery.

FAQ

Question?
Does this CPU 945 module come with a memory submodule?

Answer

No, this is the main CPU unit. A memory submodule (EPROM or EEPROM) is required for operation and must be purchased separately. The type of submodule determines the program memory capacity.

Question?
What software and cable are required to program this S5-115U CPU?

Answer

Programming is typically done using Siemens STEP 5 software. You will need a specific programming cable, often a TTY converter cable, that connects your computer’s serial port (or a USB-to-serial adapter) to the 15-pin PG port on the CPU.

Question?
Is the internal backup battery still functional on this used module?

Answer

As this is a used, obsolete item, the condition of the internal backup battery is not guaranteed. It is strongly recommended to replace the backup battery upon installation to prevent loss of the program and data during a power outage.

Last Update: Friday, March 13, 2026

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