Docs · Spec · PADIM

PADIM — Process Automation Device Information Model

Process Automation Device Information Model — process-industry instrumentation (transmitters, valves, positioners). Two registrars (PADIM + IRDI), three enums, one DTO.

OPC UA companion specification for process-automation instrumentation — pressure transmitters, level sensors, control valves, positioners. Defines the device-side information model that process-industry IIoT integrations need.

What's in the package

Artefact	Count
Enums	3
DTOs	1
Codecs	1
Registrars	2 (`PADIMRegistrar`, `IRDIRegistrar`)

Two registrars:

PADIMRegistrar — the core PADIM spec
IRDIRegistrar — IRDI (International Registration Data Identifier) metadata, used by PADIM for semantic identifiers

Loading

php examples/padim/load.php

use PhpOpcua\Client\ClientBuilder;
use PhpOpcua\Nodeset\PADIM\PADIMRegistrar;

$client = ClientBuilder::create()
    ->loadGeneratedTypes(new PADIMRegistrar())   // pulls DI
    ->connect('opc.tcp://transmitter.local:4840');

Most applications load PADIMRegistrar only. Add IRDIRegistrar when the server publishes IRDI-keyed metadata your code consumes:

php examples/padim/with-irdi.php

use PhpOpcua\Nodeset\PADIM\IRDIRegistrar;

$client = ClientBuilder::create()
    ->loadGeneratedTypes(new PADIMRegistrar())
    ->loadGeneratedTypes(new IRDIRegistrar())
    ->connect(/* … */);

Direct dependencies

Notable types

Types\PADimDataType — the spec's central process-instrument descriptor record.

Notable enums

Device-state, signal-status, and operational-mode enums specific to process instrumentation.

Loaded by

MetalForming — uses PADIM for press-side instrumentation
PAEFS — extends PADIM for energy + factory systems

Last updated · 2026-05-25

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