Siemens 6ES7142-1BD21-0XB0 SIMATIC DP BM 142 distributed I/O station 4DO 24 V DC/2A basic module

6ES7142-1BD21-0XB0 is a SIMATIC DP BM 142 distributed I/O station 4DO 24 V DC/2A basic module; its documented system role is to control four 24 V DC loads at up to 2 A per output from a distributed I/O station.

System function

Rebuilt from individual evidence

System position

Evidence and limits

6ES7142-1BD21-0XB0 is a SIMATIC DP BM 142 distributed I/O station 4DO 24 V DC/2A basic module.

In the documented system path, its role is to control four 24 V DC loads at up to 2 A per output from a distributed I/O station.

The source evidence supports the product identity and system role; installation-specific limits remain explicit unknowns.

Exact reference: 6ES7142-1BD21-0XB0
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 four 24 V DC loads at up to 2 A per output from a distributed I/O station.
System position: Sits in the distributed I/O station field I/O path between the PROFIBUS-DP master and connected field loads.
Upstream / inputs: The PROFIBUS-DP master supplies output commands and the station supplies load voltage.
Downstream / outputs: The BM 142 switches the configured 24 V DC output signals to field loads.
Limitations: Unknown: Installation-specific compatibility, firmware, replacement suitability, and current commercial availability for 6ES7142-1BD21-0XB0 were not established by this individual research.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The source identifies 6ES7142-1BD21-0XB0 as a SIMATIC DP BM 142 ET 200X 4DO 24 V DC/2A basic module.
Confidence: high
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
Controls four 24 V DC loads at up to 2 A per output from an ET 200X station.
Confidence: high
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Inferences

Inferred system position: Sits in the ET 200X field I/O path between the PROFIBUS-DP master and connected field loads.
Confidence: medium
Rationale: The exact product description and documented function place this module in the stated signal path.
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: Installation-specific compatibility, firmware, replacement suitability, and current commercial availability for 6ES7142-1BD21-0XB0 were not established by this individual research.
Confidence: low
Missing evidence: No installation-specific controller, firmware, replacement, or current commercial evidence was captured.

System position diagram

A left-to-right system path shows PROFIBUS-DP master connected through 6ES7142-1BD21-0XB0 to 24 V DC field loads. — System role inferred from the exact-reference evidence: 6ES7142-1BD21-0XB0 sits in the documented path between PROFIBUS-DP master and 24 V DC field loads.

View Mermaid source

flowchart LR upstream["PROFIBUS-DP master"] -->|configured signals| product["6ES7142-1BD21-0XB0"] product -->|documented function| downstream["24 V DC field loads"]

View diagram labels

Nodes: PROFIBUS-DP master; 6ES7142-1BD21-0XB0 SIMATIC DP BM 142 distributed I/O station 4DO 24 V DC/2A basic module; 24 V DC field loads
Edges: configured signals; documented function

Next action

The captured evidence supports a concrete system role for 6ES7142-1BD21-0XB0; installation-specific limits remain explicit unknowns.

Verify the complete 6ES7142-1BD21-0XB0 identity, installed interfaces, and project configuration before replacement or commissioning.

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