International standard for PLC programming language - Database & Sql Blog Articles

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IEC 61131 is the international standard for plc. From 1992 to 1995, the first to fourth parts of the IEC 61131 standard were issued. In November 1995, China issued GB/T15969-1/2/3/4 (equivalent to IEC 61131-1). /2/3/4). IEC 61131-3 widely uses PLC, dcs and industrial computer, "software PLC", CNC system, RTU and other products.
Five programming languages ​​are defined
1) Instruction list IL (Instruction list): Siemens is called the statement table STL.
2) Structured text ST: Siemens is called Structured Control Language (SCL).
3) Ladder diagram: Siemens is abbreviated as LAD.
4) Function block diagram FBD (Function block diagram): called the functional block diagram language in the standard.
5) Sequential function chart (SFC): Corresponds to Siemens' S7Graph.