Non centroid Tool Length and 3D probes with Allin1DC

[NeilS]

Hi,

I now have the basic retrofit of ALLin1DC to my bed mill completed and everything is working well. some good jobs completed.

The last part is to try to get the tool length and 3D touch probe going. I assume the probe functionality is unlocked on a Pro licence?

I have looked at the information in the manuals for the KP3 and the TT1 and that does shed some light but I can't find good information on the circuitry behind the probe connector on the board as to whether source or sink and the voltage (think supply is 12v). Is it possible to reassign the probe inputs to unused general Digital inputs? I can see there are parameters defining the input but need to know how to relate this to the unused DIs I have. If not can you help with the configuration of the probe inputs. I know Centroid would prefer the use of their probes but when perfectly good ones are already there I don't want to have to purchase again.

Many thanks,

Neil

[centroid467]

ALLIN1DC probe header is optically isolated with pull up to 12V. That means it will be sourcing the current so the probe should be wired to sink it to ground. A diagram is found on page 113 of the install manual.

You could use the configurable inputs but the probe header inputs on MPU11/ALLIN1DC/OAK have special internal handling for these signals.

What toolsetter and 3D probes will you be using? I'll try to help with wiring if I can find info on them.

[NeilS]

Many thanks for the reply.

The tool setter will hopefully be relatively easy as it will work with the sourcing setup on the probe output, but it is a NC contact i.e the opposite sense to the Centroid TT1. That is the circuit is broken when the tool is detected. Is it possible to invert the IO for the probe in the software the same as I have done for the Lub pump status? or will I need to do this externally?

The touch probe is less easy as that requires a 12-24Vsupply and then has an internal 10K Pull up to the switch contacts i.e it is a sourcing probe so requires a sinking load. It may be possible not to use the supply but this powers Probe ready and probe triggered lights, not vital I guess. Or perhaps a candidate for using the configurable inputs

[centroid467]

The toolsetter will need to be inverted externally if you are using the probe header. The ALLIN1DC probe header and PLC expects probes that are normally open (like conductive toolsetters).

You can use the configurable inputs and invert it there but you will need to change the corresponding parameters and PLC lines for TT detect and so on. Debounce will need to be disabled on that input.



Is the touch probe normally closed or normally open? If the probe is normally open, you should be able to convert it to a sinking output with a single MOSFET and resistor. Otherwise, two MOSFETs and three resistors. These circuits should be easy to build on a soldered prototyping board. The zener diode is to help protect the MOSFET gate.

Normally open circuit:

Normally closed circuit:

[NeilS]

Thank you that is helpful. I will investigate. Any guidance where I can find he probe header pin outs?

[tblough]

AllIn1DC manual has the header pinouts.

[NeilS]

Whilst what you say is strictly correct the pinout given is of no practical use as it only gives wire colours not their functions. It's only meaningful if you are using the Centroid probes and cables. I need to know which pins are for Tool height and touch probe signal lines plus +12V and ground so I can make my own cable up.

[cncsnw]

See page 15 of the attached hardware manual.

This manual is reproduced (and perhaps more recently updated) at the end of the Allin1DC system installation manual (see page 139 in that manual).

[cncsnw]

Alternately, here is the diagram that I use for my own reference.

[NeilS]

Many thanks