Quote Originally Posted by AndyUK View Post
Thanks Jazz, didn't realize you could use the same switch for both limit and home! I can see two advantages to using two switches; it means the limits can form part of the safety circuit, and I'm not sure I like the idea of needing software to guarantee a stop..,
It depends on how you look at it.? Limits are not really a Safety or E-stop situation, they are a positional error not really an emergency situation.
For instance, the most common limit trip isn't because machines run off on its own accord but rather because you jogged into them or set Work zero too close to limits. In which case the Software will warn you and won't allow when soft limits are turned on. However, having to reset the drives every time you jog into a limit soon becomes a pain and on small machines, this happens a lot when first learning.
Also your not actually relying on software with the UB1 or better controllers because the controller's hardware actually stops the motion and then informs software it's happened.