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6. 3 Auto-gate control
Control requirements:
1. Opening and closing of the gate should be controlled by the guard in the control
room.
2. Normally the gate shall be opened or closed completely, but the opening and
closing action can be interrupted at any time.
3. The alarm lamp shall begin to ash when the gate begins to move, and the lamp
will keep ashing as long as the gate is moving.
4. A pressure damper shall be provided so that the gate can be automatically
opened when it touches a person or an object.
The Function Block Program Diagram is shown as follows:
Description:
I1: connected to the open switch
I2: connected to the stop switch
I3: connected to the safe pressure damper
I4: connected to the close switch
Q1: connected to the ashing lamp
Q2: connected to the gate-open motor contactor
Q3: connected to the gate-close motor contactor
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