Siemens 6ES7403-1JA00-0AA0 S7-400 ER2 extension rack

The Siemens 6ES7403-1JA00-0AA0 S7-400 ER2 extension rack is an ER2 extension rack for S7-400 expansion.

System function

Rebuilt from individual evidence

System position

Evidence and limits

6ES7403-1JA00-0AA0 is identified in the source as a SIMATIC S7-400 ER2 extension rack using the 6ES7403-1JA00-0AA0 sheet-steel variant.

Routes expansion-rack module connections across the restricted I/O bus.

System position: downstream of the S7-400 central rack as an extension rack for signal and power modules.

Unknown: the installed rack topology, receive interface, module population, wiring, and physical condition are not established by the sources.

Exact reference: 6ES7403-1JA00-0AA0
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: Routes expansion-rack module connections across the restricted I/O bus.
System position: Sits downstream of the S7-400 central rack as an extension rack for signal and power modules.
Upstream / inputs: The S7-400 central rack and receive interface provide the upstream extension-bus connection.
Downstream / outputs: Compatible signal and power modules use the ER2 restricted I/O bus.
Limitations: Unknown: the installed rack topology, receive interface, module population, wiring, and physical condition are not established by the sources.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The source identifies 6ES7403-1JA00-0AA0 as a SIMATIC S7-400 ER2 extension rack using the 6ES7403-1JA00-0AA0 sheet-steel variant.
Confidence: high
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
- www.plswiss.com — retrieved 2026-09-12; medium confidence
The source documents that 6ES7403-1JA00-0AA0 extends an S7-400 station by providing a restricted I/O bus for compatible modules.
Confidence: high
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
- www.plswiss.com — retrieved 2026-09-12; medium confidence

Inferences

Inference: 6ES7403-1JA00-0AA0 occupies this system position: downstream of the S7-400 central rack as an extension rack for signal and power modules.
Confidence: medium
Rationale: The source identifies the exact reference and documents its interfaces or rack relationship.
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
- www.plswiss.com — retrieved 2026-09-12; medium confidence

Unknowns

Unknown: the installed rack topology, receive interface, module population, wiring, and physical condition are not established by the sources.
Confidence: low
Missing evidence: The source describes the product design, not the installed unit, configuration or physical condition.

System position diagram

A system path places 6ES7403-1JA00-0AA0 between an upstream system and a downstream system. — The source-supported position of 6ES7403-1JA00-0AA0 connects the upstream system to the downstream system.

View Mermaid source

flowchart LR
  upstream["Upstream system"] --> product["6ES7403-1JA00-0AA0"]
  product --> downstream["Downstream system"]

View diagram labels

Nodes: Upstream system; 6ES7403-1JA00-0AA0; Downstream system
Edges: Documented signal or power path; System connection

Next action

The evidence supports a concrete system role for 6ES7403-1JA00-0AA0.

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