The OPC UA (Open Platform Communications Unified Architecture) protocol provides a publish-subscribe client-server technology for reliable data transmission. Its architecture ensures more secure communication than its OPC predecessor, OPC DA. The OPC UA protocol offers a solution for industrial IoT because it interacts with dedicated controllers and sensors, as well as with large enterprise databases and data analysis systems.

When handling devices that implement OPC UA, Litmus Edge is deployed either as an OPC UA server or an OPC UA client.

The following diagram shows how OPC works with Litmus Edge.

The OPC UA protocol works with a wide variety of security models and transport layers. IoT applications face the following challenges.

OPC UA servers can have hundreds of different configurations:

OPC UA Includes Windows-Specific Features 

OPC UA evolved from the OPC DA (Data Access) protocol, where the clients and servers worked only in Windows. Therefore, many of the OPC UA native features, such as Discovery, work well only in Windows.

For example, when the TCP connection is on a Windows server, Litmus Edge cannot connect to it, even if other Windows-based agents can connect. Windows imposes this restriction.

As an additional challenge, not all OPC UA security policies match standard software security policy practices.

 represents complex technology and it requires some effort to generate these certificates.

, but it has its own certificate manager, which supports different encryption levels.

The OPC UA protocol provides a publish-subscribe client-server technology for reliable data transmission.

REST API

OPC UA Server

Add a Node

Import Nodes

Manage Nodes

Data Type Mapping

Hierarchy

OPC UA Server | Litmus Automation Documentation

Litmus Technical Documentation

Litmus Edge

System Architecture

User Journey

Flows and Analytics Explained

Overview

Establishing a Litmus Edge-Litmus Edge Manager Connection From the Litmus Edge Side

System Requirements

ISO Installation on Hypervisors

ISO Installation on an Industrial PC (IPC)

OVA Installation on Virtual Machine

Zerotouch Installation

Docker Installation

Kubernetes Installation

Raspberry Pi Installation

License Server Installation

Software Updates

Installation and Deployments

Access the Terminal User Interface

Access the Litmus Edge Web UI

Allen-Bradley

Atlas Copco

BACnet

Beckhoff

Brother Industries Ltd

CAN Bus

CodeSys Devices

Cutler-Hammer

Danfoss

Delta PLC

Emerson

Euromap63

Excel

Fanuc Corporation

Fuji Devices

GE Fanuc

GPIO

Heidenhain

HID Devices

Hitachi Devices

JTEKT Toyopuc

Keyence

Koyo

LS Industrial System

Lumberg Automation

Mitsubishi

Modbus

MQTT

MTConnect

ODVA

Omron

OPC UA

Opto Devices

Panasonic

Parker

Ping

Profinet

RS Automation

SAIA

Sick Flexi

Siemens

Simulator

Toshiba

VIPA

Yaskawa

Yokogawa

Industrial Systems Connection Guide

Quickstart Guide

Dashboard

Devices

Device Discovery (Network)

Utilities

DeviceHub

Create and Import Models

Manage Models

Add an Instance

Manage Instances

Digital Twins

Configure the Timeseries DB

DB Management

DB Users

DataHub

Create a Flow

Manage a Flows Manager

Manage the Flow Canvas

Flow Canvas Dashboard

Function Nodes

Configuration Nodes

Flows Manager

Analytics Flows and Processors

Analytics Flow Groups

Instances Table

Machine Learning Models

Input Processors

Output Processors

Statistical Functions

Key Performance Indicators

Analytics

Applications Dashboard

Catalog Apps

Configure

Marketplace

Containers

Networks

Images

Registry

Volumes

System Info

Disk Usage

Applications

Add a Connector

Add Topics to Connectors

Manage Connectors

Integration Connectors

Integration

Management

Certificates

Info

Network

Wi-Fi

Remote Access

Device Management

LDAP/AD Auth

Users

Tokens

Services

External Storage

Policy Management

Licenses

Events

Zerotouch

Support

Backup/Restore

System

Product Features

Organize Device and Tag Data by Using Metadata

Use the Write Topic to Send Data to a PLC

Use the Batch-Write Topic to Send Multiple Write Requests

Use the Manage Topic to Stop a Device

Use the PLC-Status Topic to Verify Connection Status

Use the Poll-Once Topic to Manually Retrieve Register Values

Use the Status Register to Connect a PLC

Use the Siemens S7 Browse Agent

Use the Mazak MTConnect Demo Agent to Connect a Device

DeviceHub Guides

Use Digital Twins to Contextualize Data

Configure an External DataHub Source

Subscribe to Topics with Flows

Use Access to Write to a Topic

Use Access to Read from a Topic

Create, Write to, and Read from a Log File

Save Multiple Register Values to a CSV File

Work with SQL Databases

Work with MongoDB Databases

Write to Databases with Integration Topics

Create a Chart

Ping a Host

Send Alerts to a Mobile Phone

Create Audio Notifications for Sensor Readings

Flows Guides

Use the Anomaly Detection Function

Use the Base Conversion Function

Use the Combination Processor Function

Use the Conversion Function

Use the Expression Processor Function

Use the Feature Extractor Function

Use the Gaussian Filter Function

Use the Inputs Processor Function

Use the Join Processor Function

Use the Linear Prediction Function

Use the Moving Window Processor Function

Use the Normalization Processor Function

Use the Rise and Fall Function

Use the Rounding Function

Use the Signal Decomposition Function

Use the Statistical Prediction Function

Use the Statistical Tests Function

Use the Tengo Script Function

Use the XMR Chart Function

Use the Asset Online Percentage KPI

Analytics Guides

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