Designing Programs; Parking Gate System Operation - Omron SFC - INTRODUCTION GUIDE Introduction Manual

2-2 Designing Programs

2-2 Designing Programs
Design the program based on system operation.

2-2-1 Parking Gate System Operation

When a car approaches the gate, a ticket is issued. The gate is opened when the ticket is taken.
When the car passes the gate, the gate is closed, and the system returns to the initial state. A
display panel is used to display status messages. Transitions between actions are initiated by
inputs from the sensors.
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The program design process is outlined below.
• Define the operation of the parking gate system.
• Clarify the conditions by which transitions of action take place.
• Create an SFC chart based on action flow.
• Create the actual I/O device control programs for each action.
When the system is waiting for a car (wait
status), the gate is closed.
: Vehicle sensor is OFF.
: Ticket sensor is OFF.
: Gate open limit sensor is OFF.
: Gate close limit sensor is ON.
: Nothing is displayed on the display panel.
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