[2026 Standards] SH/T 3092—2025, \"Design Specifications for Petrochemical Distributed Control Systems,\" will come into effect on July 1, 2026

Compared to the 2013 version, this revision focuses on addressing three key trends in the industry: 1. The need for intelligent development: meeting the requirements for integrating DCS with various advanced applications and smart devices in the construction of smart factories. 2. Cybersecurity requirements: To address the cybersecurity risks associated with industrial control systems, a multi-layered security protection system has been developed. 3. Requirements for large-scale projects: To meet the design, networking, and operation and maintenance requirements of plant-wide and combined-unit DCS systems.

Key revisions: Seven major changes 1. Optimization of the system and network architecture, with a clear hierarchical structure. The new specifications define for the first time the DCS functional structure into four layers: the process control layer, the operation monitoring layer, the data service layer, and the data buffering layer. The functional boundaries of each layer are clearly defined, as are the security responsibilities: ✔ Process control layer: Responsible for direct process control and data acquisition; it constitutes the core security domain of the system. ✔ Operation monitoring layer: Implements production operation functions such as operation, monitoring, and alarm management. ✔ Data service layer: Provides global data services such as clock synchronization, user management, backup and recovery, etc. ✔ Data buffer layer: Acts as an intermediate isolation area for data exchange between DCS and external networks, enabling secure data transfer.

The network structure follows the design principle of \"vertical layering and horizontal zoning\"; the process control network, system data network, and service data network are isolated from one another, with each operational zone having its own independent network. This not only reduces the network load but also enables fault isolation, preventing single-point failures from affecting the operation of the entire plant.

2. Strengthen system security and establish a layered defense framework. Network security is a top priority in this revision; a dedicated section on system security has been added, creating a comprehensive protection framework from four perspectives: information security, network security, security management measures, and security management systems.

3. Upgrade the alarm function to enable refined management by levels and zones. To address issues such as an excessive number of alarms and invalid alarms that interfere with operations, which are common in this industry, the new version of the standards sets clear requirements for the alarm function.

4. New requirements for remote I/O devices have been added to accommodate decentralized deployment scenarios. To meet the needs of large-scale installations with devices spread across different locations, technical specifications for remote I/O devices have been incorporated in this revision.

5. Define hardware technical specifications to improve system reliability – Clear quantitative requirements are set for the performance, reliability, and compatibility of the core hardware in DCS systems.

6. Standardize the configuration of advanced applications to support the development of smart factories. It sets clear requirements for the deployment and configuration of advanced applications such as smart device management, advanced control, and real-time data services, thereby enabling the use of intelligent functions while ensuring system security.

7. Improve the project implementation process to ensure the quality of project completion. The engineering implementation process throughout the DCS lifecycle has been standardized, with clear definitions of the tasks at each stage and the acceptance criteria.