6ES5948-3UA12 - SIMATIC S5 CPU 948 for S5-155U

SIMATIC S5 CPU 948 for S5-155U that executes the S5 user program and interfaces with the S5 central controller.

Documented system function

Rebuilt from individual evidence

System position

Documented characteristics

The source identifies this exact reference as a SIMATIC S5 CPU 948 central processing unit for S5-135U/S5-155U.

In the documented system, it processes the S5 user program and interfaces with the S5 central controller.

The source documents 640 KB RAM and an interface receptacle for a second interface.

Inferred system position: between the S5-135U/S5-155U backplane and the user program and interface paths.

Exact reference: 6ES5948-3UA12
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 user program and interfaces with the S5 central controller.
System position: Sits between the S5-135U/S5-155U backplane and the user program and interface paths.
Upstream / inputs: The central controller backplane provides the upstream module and process context.
Downstream / outputs: The CPU executes and exposes control results to the S5 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 6ES5948-3UA12 as a SIMATIC S5 CPU 948 central processing unit for S5-135U/S5-155U.
Confidence: high
- sps-service.eu — retrieved 2026-09-12; high confidence
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
The cited source describes 6ES5948-3UA12 as executing the S5 user program and interfaces with the S5 central controller.
Confidence: high
- sps-service.eu — retrieved 2026-09-12; high confidence
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
The cited source documents 640 KB RAM and an interface receptacle for a second interface.
Confidence: high
- sps-service.eu — retrieved 2026-09-12; high confidence
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Inferences

Inferred system position: between the S5-135U/S5-155U backplane and the user program and interface paths.
Confidence: medium
Rationale: The exact-reference identity and documented function establish where this component participates in the described control path.
- sps-service.eu — 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 6ES5948-3UA12.

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

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