Siemens 6ES5928-3UB11 SIMATIC S5 CPU 928B central controller module

Siemens 6ES5928-3UB11 SIMATIC S5 CPU 928B central controller module is documented for the stated industrial system role.

System function

Rebuilt from individual evidence

System position

Siemens SIMATIC S5 CPU 928B central controller module for S5-135U/155U systems.

Executes S5 control logic; the documented SI2 interface supports configurable serial communication parameters and mailboxes.

The system position is an inference from the documented component function and adjacent interfaces.

Unknown: memory configuration, firmware revision, interface wiring, installed condition, and exact system compatibility.

Exact reference: 6ES5928-3UB11
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: Executes S5 control logic; the documented SI2 interface supports configurable serial communication parameters and mailboxes.
System position: sits in the central controller layer between the S5 program, I/O process image, and communications interfaces.
Upstream / inputs: Receives the loaded control program, input image, and communication data.
Downstream / outputs: Updates output states and exchanges configured data through the CPU interfaces.
Limitations: Unknown: memory configuration, firmware revision, interface wiring, installed condition, and exact system compatibility.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Siemens SIMATIC S5 CPU 928B central controller module for S5-135U/155U systems.
Confidence: high
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
Executes S5 control logic; the documented SI2 interface supports configurable serial communication parameters and mailboxes.
Confidence: high
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
- adegis.com — retrieved 2026-09-12; high confidence

Inferences

Inferred system position: sits in the central controller layer between the S5 program, I/O process image, and communications interfaces.
Confidence: high
Rationale: The exact-reference evidence establishes the component identity and documented function; its relationship to adjacent system layers is therefore marked as an inference.
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
- adegis.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: memory configuration, firmware revision, interface wiring, installed condition, and exact system compatibility.
Confidence: low
Missing evidence: The individual lookup does not capture the installed unit, wiring, configuration, or site-specific compatibility.

System position diagram

A system diagram places Siemens 6ES5928-3UB11 SIMATIC S5 CPU 928B central controller module between the upstream system and downstream field layer; the placement is marked as an inference. — The component position is inferred from its documented function and the adjacent system layers.

View Mermaid source

flowchart LR; Upstream["Upstream system"]-->Module["6ES5928-3UB11"]; Module-->Downstream["Downstream field layer"]

View diagram labels

Nodes: Upstream system; 6ES5928-3UB11 SIMATIC S5 CPU 928B central controller module; Downstream field layer
Edges: Documented signal or power path; Inferred system connection

Next action

The captured evidence supports the exact identity and documented system role for 6ES5928-3UB11.

Confirm the target rack, wiring, load, configuration, and installed condition before replacement or commissioning.

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