Endstop issues

tecno

I have following endstops https://www.festo.com/us/en/a/download-document/datasheet/150855

BN = 24V
BK = io input
BU = GND

Built in LED lights up when magnet triggers BUT Nothing gets activated on io input.
Using Endstops Monitor plugin to visualize triggering.

Tried all combinations on M574 without ! or !^
40.out0 is 24V to BN

M574 X2 S1 P"!^40.io1.in" ; configure switch-type (e.g. microswitch) endstop for high end on X via pin io0.in
M950 P0 C"40.out0" ; config output
M42 P0 S1 ; set pwm 100%

Shorting input to GND triggers input. So is the connection wrong? Switch BN and BU ?

infiniteloop

The SME-8K is a sensor with (according to the data sheet) less-than-optimal accuracy; the +/- 0.1 mm repeatability tolerance adds up to the height of a typical first layer. A cheap microswitch would be an adequate replacement, a high-quality switch gives better results. In order to get the Festo to work, try this:

Connect BN to GND, BU to V_IN (no PWM output needed), and BK to io1.in.

Then, configure your end stop like this:

M574 X2 S1 P“^40.io.in“

Should work.

tecno

@infiniteloop said in Endstop issues:

The SME-8K is a sensor with (according to the data sheet) less-than-optimal accuracy; the +/- 0.1 mm repeatability tolerance adds up to the height of a typical first layer. A cheap microswitch would be an adequate replacement, a high-quality switch gives better results. In order to get the Festo to work, try this:

Connect BN to GND, BU to V_IN (no PWM output needed), and BK to io1.in.

Then, configure your end stop like this:
M574 X2 S1 P“^40.io.in“
Should work.

Did not work. No LED at all.
So time to dig out some mechanical end switches

Just a note PWM out was easiest way to get power so it is needed

infiniteloop

@tecno said in Endstop issues:

Did not work. No LED at all.

Using a multimeter, what voltage do you read at BK when the Festo is at the magnet, what do you read when it's not?

tecno

@infiniteloop
Connected as per your instruction = 0.2V with or without magnet

infiniteloop

@tecno said in Endstop issues:

Just a note PWM out was easiest way to get power so it is needed

I wouldn't trust a PWM signal to be always high. Festo and their suppliers do not provide application notes, but this thing should be, at the bottom, a simple reed switch, which I suppose to work fine with 5V, too.

infiniteloop

@tecno said in Endstop issues:

0.2V with or without magnet

Did you measure BK against BU?

tecno

@infiniteloop

Haven't tried to use 5V = same shit no go

So I will use some mechanical

Nightowl

@tecno
I don't know anything about these proximity sensors, but experience with mechanical end switches is that they're less consistent.

Have you tried something like these or these? I replaced my mechanical switches with the UK ones, and they work really well - even at 5V.

tecno

@nightowl999

Way too big for my taste, and yes I have tried.

fcwilt

@tecno said in Endstop issues:

@nightowl999

Way too big for my taste, and yes I have tried.

Just about every kind of inductive sensor you might need. This is the source I use.

Inductive Sensors Supplier

Frederick

tecno

@fcwilt
I know about them but way too expensive to get parts to Sweden.

fcwilt

@tecno said in Endstop issues:

@fcwilt
I know about them but way too expensive to get parts to Sweden.

My bad - didn't know you were in Sweden.

Frederick

tecno

@fcwilt

No worries Frederick

tecno

Problem solved !

Micro switches on each tower now.

A Former User

This post is deleted!

fcwilt

@arnold_r_clark said in Endstop issues:

@tecno

On my Delta i use These

I use them for Z probes but never thought of using them for endstops.

To date I have used micro-switches or IR beam-break detectors.

Thanks for sharing another approach.

Frederick

A Former User

This post is deleted!