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Why are end stops NO instead of NC?

Posted by Dschiri1

Dschiri1

Why are end stops NO instead of NC?
July 14, 2013 01:44PM

Registered: 10 years ago
Posts: 5

I am using a sanguinololu 1.3a solution for my 3D printer. When I purchased my endstops they sent me NC instead of NO. Will it cause a problem if NC end stops are used? Why are end stops NO instead of NC?
I know that under configuration.h file
ENDSTOP_INVERT=false
Needs to be set.
What was the logic for NO end stops selection?

Thanks

Reply Quote

lajos

Re: Why are end stops NO instead of NC?
July 14, 2013 10:04PM

Registered: 10 years ago
Posts: 180

As you said there are different endstops. Some are NO, some are NC, and some have both NO and NC pins. So it makes sense to have both options.

As long as you wire it correctly and the setting is right in the firmware, either way works. My endstop is wired normally open.

Reply Quote

tenbaht

Re: Why are end stops NO instead of NC?
July 27, 2013 04:36AM

Registered: 11 years ago
Posts: 19

The idea of NC endstops is that a broken wire is detected immediately.

If a connection breaks using a NO endstop would cause the homing routine to smash the axis against the limit and never stop the motor.

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