Siemens AG from Germany developed the SIMATIC PCS7 DCS based on the SIMATIC S5 and S7 platforms. The engineering toolset used in this system is built upon the IEC1131-3 standard, ensuring consistency and flexibility in configuration. Moore Process Automation utilizes 4-mation configuration software within its quadruple redundant safety PLC (QUADLOG) control system. This software supports all four programming languages defined by the IEC1131-3 standard: Ladder Diagram, Sequential Function Chart, Function Block Diagram, and Structured Text. It's also integrated into the company’s APACS DCS/PLC hybrid control system.
Fisher-Rosemount introduced the DeltaV control system in 1996, which features fieldbus capabilities and adheres to the IEC1131-3 standard for configuration. Similarly, the MAX1000+PLUS DCS from L&N incorporates ISaGRAF software from CJ International of France into its MAXVUE configuration tool, expanding it to support five of the IEC1131-3 programming functions. Another example is DigiTool, part of Hartmann & Braun’s Freelance2000 DCS configuration software, which supports four IEC1131-3 languages and includes over 190 tested function blocks and 200 user-configurable graphical symbols.
CiT’s MOX modular open control system, including the CSS sampling monitoring system, also follows the IEC1131-3 standard and uses ISaGRAF software. To enhance interoperability across different systems, the International Fieldbus Foundation has developed several standard function blocks that align with the IEC1131-3 functional block diagram specifications.
Notably, ISaGRAF, developed by CJ International of France, is one of only three configuration tools currently compliant with the IEC1131-3 standard, alongside InControl by Wonderware and Paradym by Wizdom Controls. ISaGRAF offers a Windows-based, intuitive platform for configuring, debugging, and maintaining systems, making it highly user-friendly.
In China, domestic DCS products have not lagged behind in adopting the IEC1131-3 standard. The Intelligent Equipment Institute under the Ministry of Metallurgy was among the first to introduce the standard in the EIC2000 fieldbus control system. This system integrates ISaGRAF software in both the EIC2000-LON and EIC2000-ST subsystems. Beijing Hollysys also recognized the importance of the standard early on, incorporating ladder diagrams, function block diagrams, and structured text into their HS2000 DCS and FOCS band site launched in 1999. Their MACS advanced control system supports all five IEC1131-3 programming languages.
Shanghai Xinhua Control Engineering Co., Ltd.’s XDPS-400 DCS, widely used in the power industry, employs the functional block diagram language of the IEC1131-3 standard. Zhejiang Weisheng Automation, known for its applications in the chemical industry, has adopted IEC1131-3-compliant control configuration software in its FB-3000 DCS. Zhejiang Zhehai Naizhong Automation, with over 500 DCS installations, now includes support for ladder diagrams, function block diagrams, and sequential function charts in its JX-300X system. Shenzhen Deweisen Company introduced the TCS flexible control system in June 2000, using TP311 and TP321 configuration software that complies with the IEC1131-3 standard.
In practical applications, such as material composition batching control using the HS2000 DCS, the combination of ladder diagrams, function block diagrams, and structured text proves highly effective. For instance, structured text was particularly useful in handling complex algorithms for material ratio control based on X-ray fluorescence analyzer results, without any limitations in functionality or usability.
In conclusion, the use of IEC1131-3 standard programming languages is not only convenient and practical but also highly standardized. Users can quickly adapt to new systems and apply their existing knowledge effectively. For manufacturers, focusing on hardware, networking, and other aspects of DCS becomes more efficient. Therefore, DCS control configuration software that adheres to the IEC1131-3 standard should be a key direction for future development in the industry.
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