Sequential function chart - Wikipedia, the free encyclopedia
Sequential function chart. From Wikipedia, the free encyclopedia. Jump ... Sequential function chart (SFC) is a graphical programming language used for PLCs. ...
en.wikipedia.org

Sequential Function Chart Language
The other advantage of the sequential function chart programming is that it is self-documenting. ... Sequential Function Chart Program Symbols. Basic rules for ...
kernow.curtin.edu.au

20. SEQUENTIAL FUNCTION CHARTS
state diagrams, or with more mature techniques such as Sequential Function Charts. ... Sequential function charts are suited to processes with parallel operations ...
claymore.engineer.gvsu.edu

IEC 1131 Sequential Function Charts
Sequential Function Chart. Function Block Diagram. Structured Text. Instruction Lists ... In a sequential configuration, the processor simply executes the ...
www.software.rockwell.com

SEQUENTIAL FUNCTION CHARTS-SFCs
The international forum for control engineers, system integrators, and ... I did some study on Sequential Function Charts (SFCs) programming and found it ...
www.control.com

Sequential Function Charts for All | PLCdev
A step by step guide on how to design control systems with Sequential Function Charts (SFC) ... Implementing Sequential Function Chart Designs using Ladder ...
www.plcdev.com

Series 90 Sequential Function Chart Programming Language User's Manual ...
provides an introduction to sequential function chart ... Sequential Function Chart (SFC) is a graphical, state language which is IEC-compliant. ...
www.geindustrial.com

Sequential Function Chart
ISaGRAF Sequential Function Chart Programming. Sequential Function Chart Programming ... Ideal for Batch or Sequential processes and Organization of large projects ...
www.sixnetio.com

[PSS 21S-4V2B3] I/A Series Sequential Function Chart/Structured Text ...
Sequential Function Chart/Structured Text (SFC/ST) ... IEC 61131-3 standard for both sequential function. chart (SFC) elements and structured text (ST) ...
resource.invensys.com

PLC
IEC 1131 Sequential Function Charts - Rockwell Automation ... Sequential Function Chart Language - Curtin University of Technology ...
controlsweekly.com

Warning: mkdir() [function.mkdir]: Permission denied in /home/webs/affiliatelib2/CacheManager.php on line 12

Warning: mkdir() [function.mkdir]: No such file or directory in /home/webs/affiliatelib2/CacheManager.php on line 12

Warning: fopen(/home/templatecore2cache//*cluesnet.com/37/37b49b3b1e6527004986b96a3dc7ac89527407df.tc2cache) [function.fopen]: failed to open stream: No such file or directory in /home/webs/affiliatelib2/CacheManager.php on line 130

Warning: fwrite(): supplied argument is not a valid stream resource in /home/webs/affiliatelib2/CacheManager.php on line 131

Warning: fclose(): supplied argument is not a valid stream resource in /home/webs/affiliatelib2/CacheManager.php on line 132

Sequential function chart (SFC) is a graphical programming language used for Programmable logic controller. It is one of the five languages defined by IEC 61131-3 standard. The SFC standard is defined in IEC 848, "Preparation of function charts for control systems", and was based on GRAFCET.

It can be used to program processes that can be split into steps.

Main components of SFC are:

• Steps with associated actions
• Transitions with associated logic condition
• Directed links between steps and transitions

Steps in an SFC diagram can be active or inactive. Actions are only executed for active steps. A step can be active for one of two motives:(1) It is an initial step as specified by the programmer(2) It was activated during a scan cycle and not deactivated since

Steps are activated when all steps above it are active and the connecting transition is superable (i.e. its associated condition is true). When a transition is passed, all steps above are deactivated at once and after all steps below are activated at once

Actions associated with steps can be of several types, the most relevant ones being Continuous (N), Set (S) and Reset (R). Apart from the obvious meaning of Set and Reset, an N action ensures that its target variable is set to 1 as long as the step is active. An SFC rule states that if two steps have an N action on the same target, the variable must never be reset to 0. It is also possible to insert LD (Ladder Diagram) actions inside an SFC program (and this is the standard way, for instance, to work on integer variables)

SFC is an inherently parallel language in that multiple control flows (POUs in the standard's parlance) can be active at once

Non-standard extensions to the language include macroactions: i.e. actions inside a program unit that influence the state of another program unit. The most relevant such macroaction is "forcing", in which a POU can decide the active steps of another POU