Siemens AG from Germany developed the SIMATIC PCS7 DCS based on the SIMATIC S5 and S7 systems. The engineering toolset used in this system follows the IEC1131-3 standard, which is a widely accepted international standard for industrial control programming. Moore Process Automatic Solution uses 4-mation configuration software in its quadruple redundant safety PLC (QUADLOG) control system. This software supports four of the five programming languages defined by the IEC1131-3 standard: ladder diagrams, sequential function charts, function block diagrams, and structured text. It's also used in their APACS DCS/PLC hybrid control system.
Fisher-Rosemount introduced the DeltaV control system in 1996, which features fieldbus capabilities and also adheres to the IEC1131-3 standard. Similarly, the MAX1000+PLUS DCS from L&N integrates ISaGRAF software from CJ International of France into its configuration tool MAXVUE, expanding it to support all five programming languages of the IEC1131-3 standard. Another example is DigiTool, the Freelance2000 DCS configuration software from Hartmann & Braun, which supports four of the IEC1131-3 standard’s languages: ladder diagram, sequential function chart, function block diagram, and instruction list. It also offers over 190 field-tested function block subroutines and more than 200 user-configurable graphical symbols.
The MOX modular open control system, developed by CiT (known for Citect industrial control software), also adopts the IEC1131-3 standard. ISaGRAF is used in this system as well. To promote interoperability among different products, the International Fieldbus Foundation has created dozens of standard function blocks that follow the IEC1131-3 functional block diagram specifications.
ISaGRAF, developed by CJ International of France, is one of only three configuration software solutions that currently conform to the IEC1131-3 standard, alongside InControl by Wonderware and Paradym by Wizdom Controls. ISaGRAF is a Windows-based, graphical platform that simplifies system configuration, debugging, and maintenance. Its intuitive interface makes it easy for engineers to work with complex control logic.
Domestically, Chinese DCS manufacturers have also embraced the IEC1131-3 standard. The Institute of Automation under the Ministry of Metallurgy was among the first to introduce the standard, implementing it in the EIC2000 fieldbus control system. ISaGRAF was used in both the OnLon software of the EIC2000-LON subsystem and the Workbench software of the EIC2000-ST subsystem.
Beijing Hollysys recognized the importance of the standard early on and incorporated ladder diagram, function block diagram, and structured text into its HS2000 DCS and FOCS band site launched in 1999. Their MACS advanced control system fully supports all five IEC1131-3 programming languages. Shanghai Xinhua Control Engineering Co., Ltd.'s XDPS-400 DCS, known for its performance in the power industry, uses the functional block diagram language from the IEC1131-3 standard.
Zhejiang Weisheng Automation, with many applications in the chemical industry, adopted IEC1131-3 compliant control configuration software in its FB-3000 DCS supporting fieldbus. Zhejiang Zhehai Naizhong Automation, which has deployed over 500 DCS systems, introduced the JX-300X system, which supports ladder diagram, function block diagram, and sequential function chart. In June 2000, Shenzhen Deweisen Company launched the TCS flexible control system, with TP311 and TP321 configuration software following the IEC1131-3 standard.
In practical engineering, the HS2000 DCS used for material composition batching control successfully utilized ladder diagrams, function block diagrams, and structured text. Structured text proved particularly powerful in handling complex algorithms for material ratio control, especially when integrating data from an X-ray fluorescence analyzer. There was no sense that the IEC1131-3 standard was unsuitable for process control.
In conclusion, the use of IEC1131-3 standard programming languages is efficient, practical, and highly standardized. Users can quickly adapt to new systems using their existing knowledge. For manufacturers, this allows them to focus resources on hardware, networking, or other aspects of DCS development. Therefore, DCS control configuration software that follows the IEC1131-3 standard should be a key direction for future development in the industry.
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