Siemens SIMATIC S5-115U CPU 941 Module

Description

The Siemens 6ES5 941-7UA12 is a Central Processing Unit (CPU) for the proven SIMATIC S5-115U automation system. As the core of the controller, this CPU 941 executes the user program and manages communication with other modules in the rack. Despite being an obsolete product, it remains a vital component for maintaining and repairing countless legacy systems still in operation worldwide, offering a cost-effective solution to avoid a complete system overhaul.

Specifications

• Manufacturer: Siemens
• Product Line: SIMATIC S5
• System: S5-115U
• Module Type: Central Processing Unit (CPU) 941
• Part Number: 6ES5 941-7UA12

Label Info

• Model: 6ES5 941-7UA12
• E-Stand (Hardware Version): 06

Application

This CPU is designed for small to medium-sized control tasks in various industries, including manufacturing, process control, and building automation. It is ideal for applications where the reliability and simplicity of the S5 platform are paramount.

Country of Origin

Made in Germany.

CO2 Impact

Opting for this refurbished CPU module prevents the manufacturing of a new unit, saving an estimated 48 kg of CO2. This saving is comparable to the emissions from driving a standard car for 240 kilometers.

Availability

This is an obsolete item, available as a refurbished spare part. Stock is limited. Order now from PLC2Day for expert support and fast delivery.

FAQ

Question?
What memory module is compatible with the CPU 941 (6ES5 941-7UA12)?
Answer:

This CPU typically uses Siemens EPROM or EEPROM memory submodules from the 6ES5 series, such as the 6ES5 375-0LAxx range. The specific submodule required depends on the size of your user program.

Question?
Can I program this CPU with TIA Portal or modern STEP 7?
Answer:

No. The SIMATIC S5 family requires the legacy STEP 5 programming software. It is not compatible with modern Siemens engineering software like STEP 7 (for S7-300/400) or TIA Portal (for S7-1200/1500).

Question?
What is the purpose of the 'E-Stand: 06' on the label?
Answer:

The 'E-Stand' or 'Ausgabestand' indicates the hardware and firmware revision of the module. Version '06' is a specific iteration, which can be important for compatibility with certain features or other modules within the S5 system.

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Friday, March 13, 2026