Siemens 6ED1055-1CB00-0BA2 LOGO! DM8 24 digital I/O expansion module

Siemens 6ED1055-1CB00-0BA2 is documented for the stated industrial system role: Controls and expands a LOGO! 8 controller with four digital inputs and four transistor outputs.

System function

Rebuilt from individual evidence

System position

Siemens identifies 6ED1055-1CB00-0BA2 as a LOGO! DM8 24 expansion module for LOGO! 8.

The Siemens data sheet specifies 24 V supply/I/O, 4 digital inputs, 4 transistor outputs, and 35 mm DIN-rail mounting for the exact module.

Controls and expands a LOGO! 8 controller with four digital inputs and four transistor outputs.

The system position is an explicit inference from the exact-reference evidence.

Unknown: base-module firmware, expansion order, output loading, wiring, and installation-specific compatibility.

Exact reference: 6ED1055-1CB00-0BA2
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: Controls and expands a LOGO! 8 controller with four digital inputs and four transistor outputs.
System position: Sits as an I/O expansion stage beside the LOGO! 8 base module, between added field wiring and downstream loads.
Upstream / inputs: Receives the LOGO! expansion connection and four additional digital field signals.
Downstream / outputs: Switches four transistor outputs under the LOGO! 8 program's control.
Limitations: Unknown: base-module firmware, expansion order, output loading, wiring, and installation-specific compatibility.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Siemens identifies 6ED1055-1CB00-0BA2 as a LOGO! DM8 24 expansion module for LOGO! 8.
Confidence: high
- support.industry.siemens.com — retrieved 2026-09-12; high confidence
The Siemens data sheet specifies 24 V supply/I/O, 4 digital inputs, 4 transistor outputs, and 35 mm DIN-rail mounting for the exact module.
Confidence: high
- support.industry.siemens.com — retrieved 2026-09-12; high confidence

Inferences

Inferred system position: Sits as an I/O expansion stage beside the LOGO! 8 base module, between added field wiring and downstream loads.
Confidence: high
Rationale: The exact-reference sources establish the product identity and documented interfaces; their relationship to the stated upstream and downstream elements is marked as an inference.
- support.industry.siemens.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: base-module firmware, expansion order, output loading, wiring, and installation-specific compatibility.
Confidence: low
Missing evidence: The individual lookup does not establish the installation, configured software, physical condition, or current commercial record.

System position diagram

Reading limit: system position only, not a wiring or safety drawing.

The component placement between the documented upstream and downstream elements is an explicit inference.

View Mermaid source

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

View diagram labels

Nodes: LOGO! 8 base module and additional field signals; Siemens 6ED1055-1CB00-0BA2 LOGO! DM8 24 digital I/O expansion module; Four transistor-switched machine-control circuits
Edges: Input and control data; Processed output

Next action

Siemens data-sheet evidence supports the exact expansion-module identity, I/O function, and system position.

Confirm the target controller, wiring, configuration, and installation constraints before deployment or replacement.

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