This section provides a detailed view of the internal architecture, design choices, and implementation principles of S2OPC.

Architecture

S2OPC architecture is based on embedded requirement:

Small footprint
OS independent
Minimal functionalities
High level of security
Certifications

PubSub over TSN

S2OPC is ready for integration with TSN networks.

S2OPC OPC UA realtime secure PubSub over TSN demonstrator:

S2OPC PubSub also includes:

Secure authentication of IIoT devices
Ensuring the confidentiality and integrity of data exchanges with the rest of the system.
End-to-end encryption of the PubSub protocol with cryptoprocessor (TPM).
Dynamically configurable PubSub communication
OPC UA companion specification support
Multiple publishers and subscribers
Publisher and Subscriber scheduler
Multiple DSMs

The approach presented has been developed in collaboration with Thales Research & Technology.

Formal methods at the heart of development

Formal methods provide a very good confidence of bug less software. They are widely used in critical software development.

S2OPC OPC UA functionalities (OPC UA Part 4 – Services Release Specification) have been developed following the B formal method. An article has been written to explain S2OPC approach of using B method development.

Supported OPC UA Services

Address Space Model & Informations

Address Space Base
Address Space Atomicity
Address Space Full Array Only
Base Info Core Structure
Base Info GetMonitoredItems Method
Base Info ResendData Method

Discovery Services

Discovery Get Endpoints
Discovery Find Servers Self

Session Services

Session General Service Behaviour
Session Base
Session Change User
Session Minimum 50 Parallel +

Protocol and Encoding

Protocol UA TCP
UA Secure Conversation
UA Binary Encoding

Subscription Services

Monitor Basic / Value Change
Monitor 500 Items +
Subscription Basic
Subscription Minimum 5 +
Subscription Publish Minimum 10+

View & Attributes Services

Read / Write Values & Status Code & Timestamp
Method Call
Browse
Translate Browse Path
Register Nodes

Security

Authentification Anonymous or User/Password
Security Policy None / Basic 256 / Sha 256
Aes128-Sha256-RsaOaep
Aes256-Sha256-RsaPss
PubSub-Aes256-CTR

Profiles of the OPC Foundation available here

Runtime environments and resources

Hardware architectures: ARM et x86.

Operating systems:

FreeRTOS
Linux
PikeOS
Vx Works
Windows
Zephyr

ROM (x86-64) – Linux: 1,5 MB – FreeRTOS: 1 MB
RAM (x86-64) – Linux: 1,5 MB – FreeRTOS : 256 kB

How can we help you?

Just leave your message and we’ll get in touch with you.

Tech Corner