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BS EN 61131-3:2013

BS EN 61131-3:2013

$215.11

Programmable controllers – Programming languages

Published By Publication Date Number of Pages
BSI 2013 234
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IEC 61131-3:2013 specifies the syntax and semantics of a unified suite of programming languages for programmable controllers (PCs). This suite consists of two textual languages, Instruction List (IL) and Structured Text (ST), and two graphical languages, Ladder Diagram (LD) and Function Block Diagram (FBD). This third edition cancels and replaces the second edition, published in 2003 and constitutes a technical revision. It includes the following significant technical changes: It is a compatible extension of the second edition. The main extensions are new data types and conversion functions, references, name spaces and the object oriented features of classes and function blocks.

PDF Catalog

PDF Pages PDF Title
6 English
CONTENTS
11 1 Scope
2 Normative references
3 Terms and definitions
20 4 Architectural models
4.1 Software model
Figures
Figure 1 โ€“ Software model
21 4.2 Communication model
23 Figure 3 โ€“ Combination of programmable controller language elements
24 5 Compliance
5.1 General
5.2 Feature tables
5.3 Implementerโ€™s compliance statement
25 Figure 4 โ€“ Implementerโ€™s compliance statement (Example)
26 6 Common elements
6.1 Use of printed characters
6.1.1 Character set
6.1.2 Identifiers
6.1.3 Keywords
Tables
Table 1 โ€“ Character set
Table 2 โ€“ Identifiers
27 6.1.4 Use of white space
6.1.5 Comments
Table 3 โ€“ Comments
28 6.2 Pragma
6.3 Literals โ€“ External representation of data
6.3.1 General
6.3.2 Numeric literals and string literals
Table 4 โ€“ Pragma
29 Table 5 โ€“ Numeric literals
30 6.3.3 Character string literals
Table 6 โ€“ Character string literals
31 6.3.4 Duration literal
Table 7 โ€“ Two-character combinations in character strings
Table 8 โ€“ Duration literals
32 6.3.5 Date and time of day literal
6.4 Data types
6.4.1 General
6.4.2 Elementary data types (BOOL, INT, REAL, STRING, etc.)
Table 9 โ€“ Date and time of day literals
33 Table 10 โ€“ Elementary data types
35 6.4.3 Generic data types
36 6.4.4 User-defined data types
Figure 5 โ€“ Hierarchy of the generic data types
37 Figure 6 โ€“ Initialization by literals and constant expressions (Rules)
Table 11 โ€“ Declaration of user-defined data types and initialization
48 Table 12 โ€“ Reference operations
49 6.5 Variables
6.5.1 Declaration and initialization of variables
50 Table 13 โ€“ Declaration of variables
51 6.5.2 Variable sections
Table 14 โ€“ Initialization of variables
52 Figure 7 โ€“ Variable declaration keywords (Summary)
53 6.5.3 Variable length ARRAY variables
Figure 8 โ€“ Usage of VAR_GLOBAL, VAR_EXTERNAL and CONSTANT (Rules)
54 Table 15 โ€“ Variable-length ARRAY variables
55 6.5.4 Constant variables
56 6.5.5 Directly represented variables ( % )
Table 16 โ€“ Directly represented variables
58 6.5.6 Retentive variables (RETAIN, NON_RETAIN)
59 Figure 9 โ€“ Conditions for the initial value of a variable (Rules)
60 6.6 Program organization units (POUs)
6.6.1 Common features for POUs
62 Table 17 โ€“ Partial access of ANY_BIT variables
65 Figure 10 โ€“ Formal and non-formal representation of call (Examples)
67 Table 18 โ€“ Execution control graphically using EN and ENO
69 Figure 11 โ€“ Data type conversion rules โ€“ implicit and/or explicit (Summary)
70 Figure 12 โ€“ Supported implicit type conversions
72 6.6.2 Functions
74 Table 19 โ€“ Function declaration
76 Table 20 โ€“ Function call
78 Table 21 โ€“ Typed and overloaded functions
80 Table 22 โ€“ Data type conversion function
82 Table 23 โ€“ Data type conversion of numeric data types
84 Table 24 โ€“ Data type conversion of bit data types
85 Table 25 โ€“ Data type conversion of bit and numeric types
87 Table 26 โ€“ Data type conversion of date and time types
88 Table 27 โ€“ Data type conversion of character types
89 Table 28 โ€“ Numerical and arithmetic functions
90 Table 29 โ€“ Arithmetic functions
91 Table 30 โ€“ Bit shift functions
Table 31 โ€“ Bitwise Boolean functions
92 Table 32 โ€“ Selection functions d
93 Table 33 โ€“ Comparison functions
94 Table 34 โ€“ Character string functions
95 Table 35 โ€“ Numerical functions of time and duration data types
96 Table 36 โ€“ Additional functions of time data types CONCAT and SPLIT
100 Table 37 โ€“ Function for endianess conversion
Table 38 โ€“ Functions of enumerated data types
101 6.6.3 Function blocks
Table 39 โ€“ Validate functions
102 Table 40 โ€“ Function block type declaration
106 Table 41 โ€“ Function block instance declaration
107 Table 42 โ€“ Function block call
110 Figure 13 โ€“ Usage of function block input and output parameters (Rules)
111 Figure 14 โ€“ Usage of function block input and output parameters (Illustration of rules)
114 Table 43 โ€“ Standard bistable function blocksa
115 Table 44 โ€“ Standard edge detection function blocks
Table 45 โ€“ Standard counter function blocks
117 Table 46 โ€“ Standard timer function blocks
118 Figure 15 โ€“ Standard timer function blocks โ€“ timing diagrams (Rules)
119 6.6.4 Programs
Table 47 โ€“ Program declaration
120 6.6.5 Classes
121 Figure 16 โ€“ Overview of inheritance and interface implementation
122 Table 48 โ€“ Class
124 Table 49 โ€“ Class instance declaration
127 Table 50 โ€“ Textual call of methods โ€“ Formal and non-formal parameter list
130 Figure 17 โ€“ Inheritance of classes (Illustration)
139 6.6.6 Interface
Table 51 โ€“ Interface
140 Figure 18 โ€“ Interface with derived classes (Illustration)
145 Figure 19 โ€“ Inheritance of interface and class (Illustration)
148 6.6.7 Object oriented features for function blocks
Table 52 โ€“ Assignment attempt
149 Table 53 โ€“ Object oriented function block
151 Figure 20 โ€“ Function block with optional body and methods (Illustration)
153 Figure 21 โ€“ Inheritance of function block body with SUPER() (Example)
154 6.6.8 Polymorphism
157 6.7 Sequential Function Chart (SFC) elements
6.7.1 General
6.7.2 Steps
158 Table 54 โ€“ SFC step
159 6.7.3 Transitions
160 Table 55 โ€“ SFC transition and transition condition
162 6.7.4 Actions
Table 56 โ€“ SFC declaration of actions
164 Table 57 โ€“ Step/action association
165 Table 58 โ€“ Action block
Table 59 โ€“ Action qualifiers
167 Figure 22 โ€“ ACTION_CONTROL function block โ€“ External interface (Summary)
168 Figure 23 โ€“ ACTION_CONTROL function block body (Summary)
170 6.7.5 Rules of evolution
Figure 24 โ€“ Action control (Example)
Table 60 โ€“ Action control features
171 Table 61 โ€“ Sequence evolution โ€“ graphical
176 Figure 25 โ€“ SFC evolution (Rules)
177 Figure 26 โ€“ SFC errors (Example)
178 6.8 Configuration elements
6.8.1 General
179 Figure 27 โ€“ Configuration (Example)
180 Table 62 โ€“ Configuration and resource declaration
182 6.8.2 Tasks
Figure 28 โ€“ CONFIGURATION and RESOURCE declaration (Example)
184 Table 63 โ€“ Task
188 6.9 Namespaces
6.9.1 General
6.9.2 Declaration
191 Figure 29 โ€“ Accessibility using namespaces (Rules)
193 Table 64 โ€“ Namespace
194 6.9.3 Usage
6.9.4 Namespace directive USING
Table 65 โ€“ Nested namespace declaration options
196 Table 66 โ€“ Namespace directive USING
197 7 Textual languages
7.1 Common elements
7.2 Instruction list (IL)
7.2.1 General
7.2.2 Instructions
Figure 30 โ€“ Common textual elements (Summary)
198 7.2.3 Operators, modifiers and operands
199 Table 67 โ€“ Parenthesized expression for IL language
Table 68 โ€“ Instruction list operators
200 7.2.4 Functions and function blocks
201 Table 69 โ€“ Calls for IL language
203 7.3 Structured Text (ST)
7.3.1 General
7.3.2 Expressions
Table 70 โ€“ Standard function block operators for IL language
204 Table 71 โ€“ Operators of the ST language
205 7.3.3 Statements
Table 72 โ€“ ST language statements
210 8 Graphic languages
8.1 Common elements
8.1.1 General
211 8.1.2 Representation of variables and instances
213 8.1.3 Representation of lines and blocks
214 8.1.4 Direction of flow in networks
215 8.1.5 Evaluation of networks
216 8.1.6 Execution control elements
217 8.2 Ladder diagram (LD)
8.2.1 General
Table 73 โ€“ Graphic execution control elements
218 8.2.2 Power rails
8.2.3 Link elements and states
8.2.4 Contacts
Table 74 โ€“ Power rails and link elements
219 Table 75 โ€“ Contacts
220 8.2.5 Coils
Table 76 โ€“ Coils
221 8.2.6 Functions and function blocks
8.2.7 Order of network evaluation
8.3 Function Block Diagram (FBD)
8.3.1 General
8.3.2 Combination of elements
222 8.3.3 Order of network evaluation
223 Annex A (normative) Formal specification of the languages elements
230 Annex B (informative) List of major changes and extensions of the third edition
231 Bibliography

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BS EN 61131-3:2013
$215.11