AND & OR Gate Opertion in Ladder language

AND & OR Gate Operation Using Ladder Logic

🎯 Objective:

Control two lamps using four switches through:

• AND Gate logic (series connection)
• OR Gate logic (parallel connection)

📘 Application Description

We have four input switches and two output lamps. Two control scenarios are implemented:

✅ Task 1 – AND Gate Logic (Series Connection)

• Inputs: SW1 (I0.0), SW2 (I0.1)
• Output: Lamp 1 (Q0.0)
• Logic: Lamp 1 turns ON only if both SW1 and SW2 are turned ON.
• Equivalent to: Q0.0 = I0.0 AND I0.1

✅ Task 2 – OR Gate Logic (Parallel Connection)

• Inputs: SW3 (I0.2), SW4 (I0.3)
• Output: Lamp 2 (Q0.1)
• Logic: Lamp 2 turns ON if either SW3 or SW4 is ON.
• Equivalent to: Q0.1 = I0.2 OR I0.3

🧠 Input/Output Assignment

Device	Address
SW1	I0.0
SW2	I0.1
SW3	I0.2
SW4	I0.3
Lamp 1	Q0.0
Lamp 2	Q0.1

 

Network 1 :-The first rung connects SW1 and SW2 in series—mimicking an AND gate.

Network 2 :- The second rung connects SW3 and SW4 in parallel—mimicking an OR gate.