Vector VEC-VA Series User Manual

VA Motion Controller Programming Manual
61
6 .6 SFC Sequential Function Chart Programming Language
The SFC Sequential Function Chart programming language divides a complex control
program into several small tasks, each of which is executed sequentially. In the SFC sequential
function chart programming language, each small task is calleDA “ step ” . The relationship
between “ step ” and “ step ” is called “ conversion ” . Each “ step ” carries an
action, “ step ”. , " Conversion " and " Action " are connected by " wiring " . A " step " can be
associated with multiple actions. An action consists of an action body anDAn action qualifier that
describes how the action is associated with the step. When the SFC step becomes active, the
associateDAction is executeDAccording to the action qualifier. Actions can be either a Boolean
variable or an IL, ST , LD, FBD program ( called ' details' ) . The conversion represents the case
where processing continues through the next step. If a transition becomes TRUE , the previous step
is executeDAgain and the next step becomes active. The conversion can be either a Boolean
variable or ADirectly connected Boolean expression written in FBD or LD . You can also edit the
code to be executed in another prograMCalled Detail.
The collection of connected objects is calleDANSFC network. ANSFC network must have an
initial step, which is the first step to be executed when the SFC POU is called . Parallel
branches ( executing synchronously ) or selecting branches can be inserted within
the SFC network .
6 .6.1 Creating a SFC program
Below we create a control program for traffic lights.
6 .6.2 Creating SFC network
(
1
) Create a new project. During the creation process, the program language is
SFC
and the
program name is
TrafficLight
.
Entering
TrafficLight
edit area, and then click on the left side of the editing area , " to create a
step switch sequence " as shown.
(
2
)appears in the editing area a
SFC
of " step "
S 001 ,
"action"
A001,
"conversion"
T001
as shown.

Vector VEC-VA Series Specifications

General

Brand	Vector
Model	VEC-VA Series
Category	Controller
Language	English