Docs · Spec · FDT
FDT — Field Device Tool
FDT — Field Device Tool. The older device-integration standard, predominantly DTM (Device Type Manager) integration. 11 enums, 3 typed structures.
OPC UA companion specification for FDT — the field-device integration standard built on Device Type Managers (DTMs). Predates FDI; many existing process-industry installations still use FDT.
What's in the package
| Artefact | Count |
|---|---|
| Enums | 11 |
| DTOs | 3 |
| Codecs | 3 |
| Registrars | 1 (FDTNodeSetRegistrar) |
Loading
php
examples/fdt/load.php
use PhpOpcua\Client\ClientBuilder;
use PhpOpcua\Nodeset\FDT\FDTNodeSetRegistrar;
$client = ClientBuilder::create()
->loadGeneratedTypes(new FDTNodeSetRegistrar()) // pulls DI
->connect('opc.tcp://fdt-frame.local:4840');The registrar's class name is FDTNodeSetRegistrar (matches the
XML root element), not FDTRegistrar.
Direct dependencies
Notable enums
The 11 enums cover DTM lifecycle states, connection states, session types — the operational vocabulary of FDT frames.
For FDI as the modern alternative, see FDI.
Last updated · 2026-05-25