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