6ES5945-7UA13 - SIMATIC S5 CPU 945

SIMATIC S5 CPU 945 that executes the S5-115U control program as the central processing unit.

Documented system function

Rebuilt from individual evidence

System position

Documented characteristics

The source identifies this exact reference as a SIMATIC S5 CPU 945 for the S5-115U.

In the documented system, it processes the S5-115U control program as the central processing unit.

The source documents 256 KB of memory and a slot for an additional interface module.

Inferred system position: between the S5-115U rack and its user program and interface connections.

Exact reference: 6ES5945-7UA13
Category: PLC / CPU
Evidence checked: 2026-09-12

System role

This section explains what the product does and where it acts in the surrounding system.

Function: processes the S5-115U control program as the central processing unit.
System position: Sits between the S5-115U rack and its user program and interface connections.
Upstream / inputs: The S5-115U rack supplies the CPU with the installed process context.
Downstream / outputs: The CPU executes the user program for the S5-115U control system.
Limitations: Unknown: the installed system configuration, wiring, firmware state, physical condition and replacement compatibility.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The cited source identifies 6ES5945-7UA13 as a SIMATIC S5 CPU 945 for the S5-115U.
Confidence: high
- assets.euautomation.com — retrieved 2026-09-12; high confidence
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
The cited source describes 6ES5945-7UA13 as executing the S5-115U control program as the central processing unit.
Confidence: high
- assets.euautomation.com — retrieved 2026-09-12; high confidence
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
The cited source documents 256 KB of memory and a slot for an additional interface module.
Confidence: high
- assets.euautomation.com — retrieved 2026-09-12; high confidence
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Inferences

Inferred system position: between the S5-115U rack and its user program and interface connections.
Confidence: medium
Rationale: The exact-reference identity and documented function establish where this component participates in the described control path.
- assets.euautomation.com — retrieved 2026-09-12; high confidence
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: the installed system configuration, wiring, firmware state, physical condition and replacement compatibility.
Confidence: low
Missing evidence: The individual web sources describe the product but do not establish a particular installation or unit condition.

System position diagram

The upstream system stage connects through the exact product to the downstream system stage. — The exact product participates in the system path described by the cited evidence.

View Mermaid source

flowchart LR; Upstream --> Component; Component --> Downstream

View diagram labels

Nodes: Upstream system stage; Exact product; Downstream system stage
Edges: Documented input or supply path; Documented output or control path

Next action

The captured evidence supports the documented identity and system role of 6ES5945-7UA13.

Unknown: confirm the installed rack, wiring, firmware, unit condition and replacement compatibility before use.

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