Please answer the following question: Information: - IEC 61131 is an IEC standard for programmable controllers. It was known as IEC 1131 before the change in numbering system by IEC. The parts of the IEC 61131 standard are prepared and maintained working group 7, programmable control systems, of subcommittee SC 65B of Technical Committee TC65 of the IEC. - The International Organization for Standardization (ISO) is an international standard-setting body composed of representatives from various national standards organizations. - A standards organization, standards body, standards developing organization (SDO), or standards setting organization (SSO) is an organization whose primary activities are developing, coordinating, promulgating, revising, amending, reissuing, interpreting, or otherwise producing technical standards that are intended to address the needs of a group of affected adopters. - International standards are standards developed by international standards organizations. International standards are available for consideration and use worldwide. The most prominent organization is the International Organization for Standardization (ISO). - IEC 61131 - 3 is the third part ( of 8 ) of the open international standard IEC 61131 for programmable logic controllers , and was first published in December 1993 by the IEC . The current ( third ) edition was published in February 2013 . Part 3 of IEC 61131 deals with programming languages and defines two graphical and two textual PLC programming language standards : Ladder diagram ( LD ) , graphical Function block diagram ( FBD ) , graphical Structured text ( ST ) , textual Instruction list ( IL ) , textual ( deprecated in 3rd edition of the standard ) Sequential function chart ( SFC ) , has elements to organize programs for sequential and parallel control processing . Continuous Function Chart ( CFC ) . This language is an extension to the IEC 61131 - 3 standard , which gives free positioning of graphic elements . What is the relationship between 'iec 61131-3' and 'iec standard'?
Answer:
instance of