440R-H23176 Allen-Bradley MSR210 safety relay base module

Clean-room evidence identifies 440R-H23176 as Allen-Bradley MSR210 safety relay base module. Rockwell documentation lists 440R-H23176 as an MSR210 base module used with interlocks, emergency stops, and safety mats.

Documented identity and function

Rebuilt from individual evidence

System position

Rockwell documentation lists 440R-H23176 as an MSR210 base module used with interlocks, emergency stops, and safety mats.

The exact module wiring reference documents dual input channels S11/S12 and S21/S22, feedback terminals channel 1 and channel 2, and reset terminal S34.

The system path is inferred as dual-channel emergency-stop or guard inputs and the reset circuit, then 440R-H23176, then the machine contactor or safety output circuit.

Unknown: installation compatibility, configuration, and unit condition are not established by the captured sources.

Exact reference: 440R-H23176
Category: PLC / CPU
Evidence checked: 2026-09-11

System role

This section explains what the product does and where it acts in the surrounding system.

Function: The MSR210 safety relay monitors dual-channel safety inputs and switches safety outputs for a machine control circuit.
System position: It intervenes between dual-channel emergency-stop or guard inputs and the reset circuit and the machine contactor or safety output circuit in the documented system path.
Upstream / inputs: Inputs or upstream: dual-channel emergency-stop or guard inputs and the reset circuit.
Downstream / outputs: Outputs or downstream: the machine contactor or safety output circuit.
Limitations: Unknown: installation compatibility, configuration, and unit condition are not established by the captured sources.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Rockwell documentation lists 440R-H23176 as an MSR210 base module used with interlocks, emergency stops, and safety mats.
Confidence: high
- support.rockwellautomation.com — retrieved 2026-09-11; high confidence
The exact module wiring reference documents dual input channels S11/S12 and S21/S22, feedback terminals channel 1 and channel 2, and reset terminal S34.
Confidence: high
- support.rockwellautomation.com — retrieved 2026-09-11; high confidence
- industrialmonitordirect.com — retrieved 2026-09-11; medium confidence

Inferences

Inferred system position: 440R-H23176 intervenes between dual-channel emergency-stop or guard inputs and the reset circuit and the machine contactor or safety output circuit.
Confidence: medium
Rationale: The exact-reference sources identify the component function and its connected interfaces; the intervening system position is an inference from those facts.
- support.rockwellautomation.com — retrieved 2026-09-11; high confidence
- industrialmonitordirect.com — retrieved 2026-09-11; medium confidence

Unknowns

Unknown: installation compatibility, configuration, and unit condition are not established by the captured sources.
Confidence: low
Missing evidence: No captured source provides the receiving system configuration, firmware, wiring, or unit condition.

System position diagram

Diagram showing 440R-H23176 between dual-channel emergency-stop or guard inputs and the reset circuit and the machine contactor or safety output circuit. — System path inferred from the documented function of 440R-H23176.

View Mermaid source

flowchart LR
  U["Upstream"] --> P["440R-H23176"]
  P --> D["Downstream"]

View diagram labels

Nodes: Upstream: dual-channel emergency-stop or guard inputs and the reset circuit; Device: 440R-H23176; Downstream: the machine contactor or safety output circuit
Edges: The upstream path feeds 440R-H23176.; 440R-H23176 feeds the downstream path.

Next action

Publishable as a clean-room evidence record for 440R-H23176; verify the installation against current documentation.

Confirm voltage, wiring, accessories, and service condition against the installation before substitution.

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