Hardware Controllers Protocols Standards Concepts Manufacturers

Registry Alarm codes

0x1B ERR_HOSTUNREACHABLE Host Unreachable

The target host could not be reached.

Source checked3/3 values · 2026-10-26

Specification

1 source

Code	0x1B
Meaning	The host is unreachable.

Connected

1

ControllersBeckhoff TwinCAT 3 Runtime (XAR)

Machine-readable

GET /alarm/ads-0x1b.json
GET /alarm/ads-0x1b.md

// MCP
get_entry { "id": "ads-0x1b" }

Sources

ADS Return Codes
infosys.beckhoff.com · accessed 2026-10-26

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