IEC 60848:2013 defines the GRAFCET specification language for the functional description of the behaviour of the sequential part of a control system. It specifies the symbols and rules for the graphical representation of this language, as well as for its interpretation and has been prepared for automated production systems of industrial applications. This third edition cancels and replaces the second edition published in 2002 and constitutes a global technical revision with the extended definition of the concept of variables introducing: internal variable, input variable and output variable.<\/p>\n
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|---|---|---|---|---|---|---|---|
| 5<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions 3.1 Terms in the GRAFCET <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 3.2 Terms, general purpose 4 General principles 4.1 Context <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4.2 GRAFCET, a behaviour specification language Figures Figure 1 \u2013 Graphical representation of the sequential part of a system <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 4.3 GRAFCET, short presentation 4.3.1 General 4.3.2 Structure 4.3.3 Elements for interpretation <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 4.4 Syntax rule Figure 2 \u2013 Structure and interpretation elements used in a grafcet chart to describe the behaviour of a sequential part of the system defined by its input and output variables <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 4.5 Evolution rules 4.5.1 General 4.5.2 Initial situation 4.5.3 Clearing of a transition 4.5.4 Evolution of active steps 4.5.5 Simultaneous evolutions 4.5.6 Simultaneous activation and deactivation of a step 4.6 Input events 4.6.1 General <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 4.6.2 Input events specification 4.7 Internal events 4.7.1 General 4.7.2 Internal events described by the step activation 4.7.3 Internal events described by the deactivation of a step 4.7.4 Internal events described by the clearing of a transition <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 4.8 Output modes 4.8.1 General 4.8.2 Continuous mode (assignation on state) 4.8.3 Stored mode (allocation on event) 4.9 Application of the evolution rules 4.9.1 General <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 4.9.2 Non transient evolution 4.9.3 Transient evolution 4.9.4 Consequence of a transient evolution on the assignations <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 4.9.5 Consequence of a transient evolution on the allocations 4.10 Comparison between the two output modes 4.10.1 General <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 4.10.2 Determination of the value of the outputs 4.10.3 Analysis of the value of the outputs for a grafcet chart at a defined instant 4.10.4 Actions relative to transient evolution 4.10.5 Possible conflict on the value of the outputs 5 Graphical representation of the elements <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Tables Table 1 \u2013 Steps <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Table 2 \u2013 Transitions <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Table 3 \u2013 Directed links <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Table 4 \u2013 Associated transition-conditions <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Table 5 \u2013 Continuous actions <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Table 6 \u2013 Stored actions <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Table 7 \u2013 Comments associated with elements of a grafcet chart <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | 6 Graphical representation of sequential structures 6.1 General 6.2 Basic structures 6.2.1 Sequence 6.2.2 Cycle of a single sequence <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | 6.2.3 Selection of sequences 6.2.4 Step skip <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | 6.2.5 Backward sequence skip 6.2.6 Activation of parallel sequences 6.2.7 Synchronization of sequences <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | 6.2.8 Synchronization and activation of parallel sequences <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | 6.3.3 Starting of a sequence with a source transition <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | 6.3.4 End of a sequence by a pit transition 7 Structuring 7.1 General 7.2 Partition of a grafcet chart 7.2.1 Connected grafcet chart <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | 7.2.2 Partial grafcet Table 8 \u2013 Partial grafcet chart <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | 7.3 Structuring using the forcing of a partial grafcet chart Table 9 \u2013 Forcing of a partial grafcet chart <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | 7.4 Structuring using the enclosure Table 10 \u2013 Enclosing steps <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | 7.5 Structuring using the macro-steps Figure 3 \u2013 Example of grafcet with enclosures (including description) <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | Table 11 \u2013 Macro-steps <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | Annex B (informative) Example: Automatic weighing-mixing Figure B.1 \u2013 Overview diagram of weighing-mixing system <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | Figure B.2 \u2013 Grafcet of a weighing-mixing involving only continuous actions <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | Figure B.3 \u2013 Grafcet of the weighing-mixing, involving continuous and stored actions <\/td>\n<\/tr>\n | ||||||
| 50<\/td>\n | Figure B.4 \u2013 Grafcet of the weighing-mixing, divided into a global description using macro-steps and a description detailed by the macro-step expansions <\/td>\n<\/tr>\n | ||||||
| 51<\/td>\n | Figure B.5 \u2013 Structuring with operating modes using forcing orders <\/td>\n<\/tr>\n | ||||||
| 52<\/td>\n | Figure B.6 \u2013 Structuring with operating modes using enclosing step <\/td>\n<\/tr>\n | ||||||
| 53<\/td>\n | Annex C (informative) Relations between GRAFCET of IEC 60848 and the SFC of IEC 61131-3 <\/td>\n<\/tr>\n | ||||||
| 55<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" GRAFCET specification language for sequential function charts<\/b><\/p>\n |