What is OPC UA?

OPC UA (Open Platform Communications Unified Architecture) is an industrial communication protocol that enables secure and reliable data exchange between devices, applications, and industrial systems. Understanding what is OPC UA helps organizations connect operational technology (OT) and industrial control systems (ICS) while supporting interoperability, authentication, encryption, and data integrity. It is widely used in manufacturing, energy, utilities, and other industrial environments where secure machine-to-machine communication is essential.

Why do organizations use this protocol?

Industrial environments often contain equipment from different manufacturers that must exchange operational data securely. Traditional industrial protocols may lack built-in security capabilities, making interoperability and protection more challenging.

Organizations use this to:

• Enable secure industrial communications
• Connect devices from multiple vendors
• Protect industrial data exchanges
• Support industrial automation
• Improve interoperability across OT environments

These capabilities help organizations modernize industrial networks while maintaining secure communications.

How does OPC UA work?

This protocol provides a standardized framework for exchanging information between industrial devices, software applications, and control systems. It includes built-in security features that help protect communications.

A typical workflow includes:

• A client requests access to an OPC UA server
• The server authenticates the client
• A secure communication channel is established
• The client reads or writes authorized data
• Data is transmitted securely
• Both systems maintain trusted communication

This process enables secure and standardized information exchange across industrial environments.

Which security features does OPC UA provide?

Unlike many legacy industrial protocols, it includes several security capabilities designed to protect industrial communications.

These features help organizations secure communications between industrial systems.

What challenges affect OPC UA deployments?

Although it includes built-in security, organizations must configure and manage it correctly to achieve the intended level of protection. Common challenges include:

• Certificate lifecycle management
• Legacy system integration
• Secure key management
• Access policy configuration
• Monitoring industrial communications

Organizations should combine protocol security with broader OT security practices.

Supporting secure industrial communications

Secure industrial environments depend on trusted endpoints, certificate management, and consistent policy enforcement alongside secure communication protocols. Organizations also need visibility into managed devices that interact with operational technology environments.

Hexnode can support these operational needs through:

• Certificate configuration support
• Device compliance monitoring
• Security policy enforcement
• Access-related configurations
• Centralized visibility into managed endpoints

These capabilities help organizations strengthen endpoint security alongside industrial communication security.