S₁ is mapped to I₁ and S₂ is mapped to I₂

Conditions:

1. S₁ and S₂ are OFF 2. S₁ is ON and S₂ is OFF 3. S₁ is OFF and S₂ is ON 4. S₁ and S₂ are ON

Truth table
S1 (switch1)	S2 (switch2)	Light (ouput)
0 (open)	0 (open)	0 (de-energized)
1 (close)	0 (open)	1 (energized)
0 (open)	1 (close)	1 (energized)
1 (close)	1 (close)	0 (de-energized)

S₁ is mapped to I₁ and S₂ is mapped to I₂

open

open

open

open

de-energized

0

0

0

0