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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
35 SFC Program and Step Ladder
35.1 SFC Program
Example of flows having parallel branches and recombination
1. Operation of parallel branch
• Branches in which all flows proceed at the same time are called parallel
branches.
• In the example shown on the left, when X000 turns ON while S20 is ON,
S21, S24 and S27 turn ON at the same time and the operation is started in
each flow.
• When the operation is finished in each flow and X007 turns ON, the
recombination state relay S30 turns ON. S23, S26 and S29 turn OFF.
• Such recombination is sometimes called wait recombination.
(The original flow continues its operation until all flows finish their
operations and join the original flow.)
When the parts A, B and C are processed in parallel and then assembled
afterward, flows having parallel branches and recombination are used.
2. Example of pushbutton type crosswalk
A pushbutton type crosswalk shown in the figure below can be expressed in flows having parallel branches and
recombination.
Y003: Green Y002: Yellow Y001: Red
The SFC program for a pushbutton type crosswalk is as shown below. In this example, a partial flow (jump to a state
relay located in an upper position) is repeated for blinking the green lamp on the crosswalk.
• When the PLC mode is changed from STOP to RUN, the initial state relay S0 turns ON. Normally, the green lamp
is ON for the road and the red lamp is ON for the sidewalk.
• When the crossing button X000 or X001 is pressed, the state relay S21 specifies “road: green” and the state relay
S30 specifies “sidewalk: red”. The signal lamp status is not changed.
• 30 seconds later, the yellow lamp turns ON for the road. 10 seconds later after that, the red lamp turns ON for the
road.
• When the timer T2 (5 seconds) reaches timeout after that, the green lamp turns ON for the sidewalk.
• 15 seconds later, the green lamp starts to blink for the sidewalk. (S32 turns OFF the green lamp, and S33 turns ON
the green lamp.)
• While the green lamp is blinking, S32 and S33 turn ON and OFF repeatedly. When the counter C0 (set value: 5)
turns ON, S34 turns ON. 5 seconds after the red lamp turns ON for the sidewalk, the signal lamps return to the
initial state.
• Even if the crossing button X000 or X001 is pressed in the middle of operation, the pressing is ignored.
20
1
21
2
22
3
30
TRAN
X000
TRAN
X007
23
24
4
25
5
26
27
6
28
7
29
8