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SIMATIC M7-400 EXM478 expansion module - 6ES7478-2AC00-0AC0

Sourced expansion module record for 6ES7478-2AC00-0AC0 with an explicit system role and installation unknowns.

Documented identity

Rebuilt from individual evidence

System role

Unknown: evidence limits

The cited Siemens source identifies 6ES7478-2AC00-0AC0 as SIMATIC M7-400 EXM478 expansion module.

The EXM478 routes expansion capacity for three M7-400 interface modules.

Inferred system position: sits within the m7-400 expansion path between the host module and installed if modules.

Exact reference
6ES7478-2AC00-0AC0
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
The EXM478 routes expansion capacity for three M7-400 interface modules.
System position
Inferred system position: sits within the m7-400 expansion path between the host module and installed if modules.
Upstream / inputs
The upstream configuration and process signals feed the expansion module.
Downstream / outputs
The expansion module sends processed values toward the downstream controller or equipment.
Limitations
Unknown: installed firmware, wiring, configuration, condition, and compatibility.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

  • The cited Siemens source identifies 6ES7478-2AC00-0AC0 as SIMATIC M7-400 EXM478 expansion module.

    Confidence: high

  • The EXM478 routes expansion capacity for three M7-400 interface modules.

    Confidence: high

Inferences

  • Inferred system position: sits within the m7-400 expansion path between the host module and installed if modules.

    Confidence: medium

    Rationale: The exact-reference source establishes identity and the documented module family; the adjacent system path is an engineering inference.

Unknowns

  • Unknown: installed firmware, wiring, configuration, condition, and compatibility.

    Confidence: low

    Missing evidence: The individual source does not contain installation-specific records.

System position diagram

Upstream system connects through the expansion module to downstream equipment.

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

Inferred system path through the expansion module.

Enlarged system diagram

Upstream system connects through the expansion module to downstream equipment.

Inferred system path through the expansion module.

View Mermaid source
flowchart LR; upstream[Upstream system] --> product[Product]; product --> downstream[Downstream system]
View diagram labels
Nodes
Upstream system; SIMATIC M7-400 EXM478 expansion module; Downstream system
Edges
Documented or inferred system path; Processed signal path

Next action

The cited evidence supports a conservative expansion module record for maintenance review.

Unknown: confirm the installed firmware, wiring, configuration, condition, and compatibility before replacement or integration.

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