Omron SYSMAC CX-Programmer 8.1, Operation Manual

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SFC Programming Example Section 1-4
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-> Transition condition: Trans3/Gate open limit sensor ON (gateopenLimit)
8 If 3 seconds have elapsed since the gate has fully opened, AND if the car has
passed the gate and the vehicle sensor has turned OFF, the transition conditions
are met. The reverse rotation of the gate motor is then turned ON, and the gate
begins to close.
-> Step 4: CloseGate
-> AQ: D (Delay)
-> Action: Active reverse rotation of gate motor
9 When the gate is fully closed, the reverse rotation of the gate motor is turned OFF.
-> Step 4: CloseGate
-> Action: Activate reverse rotation of gate motor
10 When the gate is fully closed, the gate close limit sensor is turned ON, and the
active status is transferred to the next step.
At this point, the reverse rotation of the gate motor is turned OFF.
-> Transition condition: Trans4/Gate close limit sensor ON (gatecloseLimit)
11 The gate returns to the waiting status, and waits for the next car.
Defining Variables for the Unattended Paid Parking Lot
SFC program user variables must be defined for the external I/O devices.
External device I/O Variable name Variable type
Vehicle sensor Input carIn Boolean
Ticket sensor Input ticket Boolean
Gate open limit sensor Input gateopenLimit Boolean
Gate close limit sensor Input gatecloseLimit Boolean
Ticket dispenser Output ticketOut Boolean
Normal operation of gate motor Output gateopen Boolean
Reverse operation of gate
motor Output gateClose Boolean
Note: It is also possible to specify actual addresses, rather than variables.