Parameter to know when a machine has been in an e-stop condition

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07 Mar 2023 21:25 #266068 by EncoderGuy
I am implementing a Tormach 8L lathe on a manufacturing production floor with non-machinists, and I am trying to poka-yoke the changeover process. I am looking for a way to know if the machine was in an e-stop condition. Is there a parameter that I can read to do this? Alternatively, is there a way to leverage the IO module to determine if the machine was pulled out of an e-stop condition?

Here is the backstory...the parts have bearings in them and the stationary portion is held in a steady-rest fixture while the rotating part is driven from the spindle. There are two different parts that we run in the machine...lets call them A and B. There is a steady-rest fixture for each part and they have different Z offsets. I am using a  Tormach 50355 Passive Probe to touch off Z on the part and set G54 to define the work offset. When we switch the steady-rest fixture I have to run a homing routine which basically calibrates the machine to the steady-rest fixture. I want to make sure that the machine gets calibrated every time the steady-rest fixture is removed/replaced and I know that an e-stop will occur when the fixture is changed.

Thank you for your assistance!

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07 Mar 2023 21:59 #266078 by andypugh
A simple (Probably Python) HAL component could monitor the machine state and write data to a file if an e-stop occurs. (Or even set a HAL pin)

What needs to know? This will help decide how to make the data available.

You might even be able to just use a HAL latch component:
linuxcnc.org/docs/stable/html/man/man9/estop_latch.9.html
Would probably work (it's a bit overkill).
You would need to connect "fault" to a suitable HAL pin (which reflects the machine state) and probably "setp" the OK input permanently true.
After calibration your routine would then need to toggle the reset pin.

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08 Mar 2023 16:14 #266121 by EncoderGuy
The cutting program needs to be blocked from running.

Perhaps said more clearly; after clearing an e-stop, the homing program must successfully run prior to permitting the cutting program to command motion.

I have not used HAL components yet, and was hoping to use a parameter or tool table offset to do this.

For other lock-outs, I have successfully used global, user-defined parameters in g-code to ensure sequencing has been followed. For example, when the homing routine for part A starts, I set #<_Homing_Complete_A> = 0 & #<_Homing_Complete_B> = 0. At the very end of the homing program I set #<_Homing_Complete_A> = 1. Then, at the start of the cutting program for part A (prior to commanding any motion) I check if #<_Homing_Complete_A> = 1 and proceed if true.

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08 Mar 2023 17:16 #266127 by andypugh

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