I have attached a schematic using push buttons instead of limit switches.
Dc motor limit switch circuit.
Used to vary the pwm of the pulses at the output and which eventually is used for the speed regulation of the connected motor.
The interlocks are specially important because if both relays are on it would be a short circuit.
The circuit uses 2 relays 2 limit switches and a dc motor.
When you switch off power to an ac circuit a voltage spark or arc is created.
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Since diode cr1 will not conduct with a negative potential across it the motor will stop.
The motor should then rotate until it hits the other limit switch and then wait for the button to be pressed again to rotate in the opposite direction.
A very cool and easy dc motor speed controller circuit could be build using a just a single mosfet a resistor and a pot as shown below.
As illustrated the relays have to be dc same coil voltage as the motor but the bottom can be separated and fed from a different voltage.
Imagine you have two circuits each carrying the same current one is an ac circuit and the other is a dc circuit.