Watlow LogicPro - Manual (Page 87)

Doc.# 28002-00 Rev 3.00 Watlow Anafaze 71
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Sequential Function Charts
Sequential Function Chart (SFC) is a graphical language
using simple graphical objects to diagram any sequential
process. SFC enhances communication between the project
manager, system architect, programmers, and operators by
providing a clear graphical representation of the process state
machine.
About SFC
SFCs provide a way to partition a controller program into a
manageable set of Steps and Transitions. These Steps and
Transitions are interconnected by directed links.
Steps include related Actions (such as filling a tank, counting
parts or waiting for a delay) that are carried out until a
Transition condition is satisfied. Once the Transition
condition is satisfied, control is transferred to the subsequent
step.
Using SFCs in LogicPro
SFCs support both serial and parallel sequential processes.
Because discrete manufacturing and process applications all
run as a sequence of Steps, SFCs are an excellent way to
logically assemble the sub-processes into a structured
program. Using these basic elements:
• Steps
• Transitions
• Actions