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- Algebraic Simplification of Logic Circuits
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- PLC-exercises II – boolean algebra
- PLC exercise – Tank level monitoring
- Work Order PLC Material detection
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- PLC-Program for H-Bridge
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### Program example: Switching the direction of rotation with H-bridge

**Option 1: Switching the direction of rotation - directly.** Only use for really small motors!

Function description: The motor can be started with button S1 in clockwise rotation (i.e. K1 active) and with button S2 (i.e. K2 active) in counterclockwise rotation. Precondition: The OFF button S0 is not pressed.

The direction of rotation can be switched directly from clockwise to counterclockwise rotation and from counterclockwise to clockwise rotation.

The process state diagramm for direct switching:

**Option 2: Switching the direction of rotation - indirectly**

The motor can be started with pushbutton S1 in clockwise rotation (i.e. K1 active) and with pushbutton S2 (i.e. K2 active) in counterclockwise rotation. Precondition: The OFF pushbutton S0 is not actuated.

The direction of rotation can only be changed after the stop button S0 has been pressed. The process diagram is as follows: