Dynomotion Forum

Dear All,

I'm looking to implement a 2 axis turning cnc machine operator panel, interested in examples and suggestion etc.

Option1 : Use a touch monitor with basic external buttons like Inti, Start, Stop, Feed-hold, E-stop and Reset.

Option2: Build a button based panel similar to industry standard and interface via Konnect Optical I/O Expansion Board.

In using option 2, i have few questions as to how does one assign kmotion screen icon buttons to Kconnect like below icons.

1. Zero all icon button.
2. measure icon
3. single step
4. Tool setup
5. Feed and Speed over ride icons
6. Jog icons
7. Jog step size
8. Tool
9. Fixture offset etc

Thank you
Sahil

Hi Sahil,

Option 1 wouldn't then be external buttons would it?

You might see the ExternalButtons.c, JogWithTogglesAndPot.c, and KFLOPtoKMotionCNCScreenScript.c examples.

Option 1 wouldn't then be external buttons would it?

That was my last option and less work too.

Thanks will study the C program examples.

Regards
Sahil

Hi,

From where can i get the screen script for basic 2 axis lathe. I'm beginning to understand how screen editor works and want to assign hotkeys.

Sahil

Hi Sahil,

I created it for you. See attached.

HI Tom,

i have a question, if one want to use the JP4 and JP6 Aux connectors in Kflop for inputs and outputs, especially the pins with 150 ohms pull down resistors what is the correct way ?

1. Current limit per pin on these connector ?
2. In JP7 it is shown as 10ma maximum.
3. at 3.3 volts rating and using the pin as output with pull down resistor could draw more current than the pin can handle ? (3.3v*150ohms = 22ma) ?

Please correct me if im wrong and how to use these pins properly ?

Regards

Sahil.A

Hi Sahil,

The 10ma is just a general recommendation especially if a lot are used.

The 3.3V LVTTL outputs are rated for 16ma minimum. 16ma is sufficient to pull up the voltage to 2.4V which is a valid high for LVTTL (2.0V max threshold).

The outputs with pull 150 Ohm down resistors can not source any significant current (e.g. > 1ma).

HTH

Noted thanks tom, i was planing on using 74AC14 and opto coupler after for isolation.

Hi Sahil,

The 74AT14 Data Sheet shows a maximum input high voltage of 2.2V @3V. At 3.3V it might be 2.4V making it somewhat marginal for the Outputs with pull down resistors. The 5V 74ACT14 version has a max input high voltage of 2.0V so might work better.

You might be able to drive optocouplers directly by using a common 3.3V and having the output sink to GND. With the output low the Opto would see almost 3.3V. When high it would see a maximum of 3.3V - 2.4V = 0.9V. So an opto (and series resistor) would need to be chosen that turns off with 0.9V applied. Most optos require 1.2 - 1.4V to even begin to turn on.

HTH