SN EN 61131-3 : 1993

1 General
  1.1 Scope
  1.2 Normative references
  1.3 Definitions
  1.4 Overview and general requirements
  1.5 Compliance
2 Common elements
  2.1 Use of printed characters
  2.2 External representation of data
  2.3 Data types
  2.4 Variables
  2.5 Program organization units
  2.6 Sequential Function Chart (SFC) elements
  2.7 Configuration elements
3 Textual languages
  3.1 Common elements
  3.2 Instruction List (IL)
  3.3 Structured Text (ST)
4 Graphic languages
  4.1 Common elements
  4.2 Ladder Diagram (LD)
  4.3 Function Block Diagram (FBD)
Annex A (normative) Specification method for textual languages
Annex B (normative) Formal specifications of language elements
Annex C (normative) Delimiters and keywords
Annex D (normative) Implementation-dependent parameters
Annex E (normative) Error conditions
Annex F (informative) Examples
Annex G (informative) Index
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications
Index
Tables
Figures

Specifies syntax and semantics of programming languages for programmable controllers.