Overview
Here is a simple motor Forward/Reverse RUN logic in Ladder Logic, typically used in PLC programming for a 3-phase motor with two contactors (one for Forward, one for Reverse), and ensuring interlocking to prevent both directions from being ON at the same time.
🧠Logic Overview
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Inputs:
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I0.0
→ Forward Push Button (NO) -
I0.1
→ Reverse Push Button (NO) -
I0.2
→ Stop Push Button (NC)
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Outputs:
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Q0.0
→ Forward Contactor Coil -
Q0.1
→ Reverse Contactor Coil
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Interlocks to prevent both directions running together.
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Sealing (latching) for continuous running until stop is pressed.
🔧 Ladder Logic Explanation
📋 Description
1. Forward Run Logic (Q0.0
)
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Starts when:
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Stop button is not pressed (I0.2 is TRUE).
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Forward button is pressed (I0.0 is TRUE).
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Reverse output is OFF (Q0.1 is FALSE).
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Self-holds (latched) using Q0.0.
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Breaks when Stop button is pressed or reverse is triggered.
2. Reverse Run Logic (Q0.1
)
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Starts when:
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Stop button is not pressed.
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Reverse button is pressed.
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Forward output is OFF.
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Self-holds using Q0.1.