Wiring up the Alarm output on Leadshine AM882

[m_c]

Given that they're NC when not activated, if you want to connect them through a single pin, then you'll need some way to invert the signal.

There are various options, however the one that involves reasonable size components is to use a small relay for each sensor.

However, looking at the specs for those sensors, they are far from ideal, given detection distance is listed as 5mm +/- 10%.
A slot type sensor is far more accurate, such as Optical End / StartStop w. mounts- For CNC, Reprap and laserengraving machine | eBay

[Shinobiwan]

However, looking at the specs for those sensors, they are far from ideal, given detection distance is listed as 5mm +/- 10%.
A slot type sensor is far more accurate, such as Optical End / StartStop w. mounts- For CNC, Reprap and laserengraving machine | eBay

I was reading the massive thread over on cnczone about the DIY version of these and it depends how you use them as far as accuracy goes. Passing the sensing object very close across the sensor is preferable to bringing the object up to the sensor. That's 20% error in the specs is at a distance of 5mm from the sensing object. The closer the object is to the sensor the more accurate it is. At 1mm they're accurate to 0.05mm or better.

There's video here showing the repeatability of these cheap ebay proximity switches using a dial indicator.

[JAZZCNC]

Given that they're NC when not activated, if you want to connect them through a single pin, then you'll need some way to invert the signal.

Missed this but it's easy fixed just set the Home input to Active low and it will see the signal when it goes low IE: The switch opens.

[m_c]

Missed this but it's easy fixed just set the Home input to Active low and it will see the signal when it goes low IE: The switch opens.

Still wouldn't work for homing ;-)
Wiring three to the same pin, unless you can make sure 2 are triggered (i.e switched open circuit) while you home the third one, it's not going to work.

[JAZZCNC]

Still wouldn't work for homing ;-)
Wiring three to the same pin, unless you can make sure 2 are triggered (i.e switched open circuit) while you home the third one, it's not going to work.

See what you mean and didn't give it a lot of thought plus I've Never used these type Switches so won't argue but I've just been looking thru PMDX126 manual and they use them wired in parallel on a single Pin so wouldn't be so sure.?