The scenario
A mine truck requests entry at a gate. The gate opens only if dispatch has approved the entry, no emergency stop is active, and no truck is already in the gate zone (a truck-passed sensor resets the latch). A maintenance override can force the gate open.
What is in this drawing
Read the decisions behind it.
01
An SR flip-flop latches the gate open from the SET condition until the truck-passed sensor triggers RESET, ensuring the gate stays open long enough for the truck to pass.
02
A maintenance override bypasses the logic to open the gate unconditionally for servicing or emergency access.
Reusable for any gated entry system requiring conditional approval, safety interlock, and manual override.
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