Why I used a Serial Switch Approach In Wiring My CNC Limit Switches

There are two choices when wiring control limit micro-switches these are:

1. Switches In Serial
2. Switches In Parallel

In my design I decided to implement a switches in serial approach and permanently on.  The reason for this is that I wanted the limit condition to be activated in the case that either of the two axis switches were triggered or in the case of the cable being broken.

As each of the items is in series any effect anywhere in the circuit will cause a limit condition.

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