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Hello Rod.
Thanks for the Info.
Too bad I can't buy it. I have no link account and with the standard checkout it says "No suitable delivery method could be found"
Is there any other option? Like PayPal or something else?
 

1. No, just ground them
2. See #1
3. Because the 7I52 (which supports RS-422/RS-485 Serial) and 7I52S use the same PCB
4. The FPGA source and HM2 driver support muxed encoders, so as long as the pinout file
    is correct, there's nothing else needed

This suggests to me that it may hang at the first G1 after the speed setting (M3 S10000)

• spindle.N.at-speed - (bit, in) Motion will pause until this pin is TRUE, under the following conditions:
  • before the first feed move after each spindle start or speed change;
  • before the start of every chain of spindle-synchronized moves;
  • and if in CSS mode, at every rapid to feed transition. This input can be used to ensure that the spindle is up to speed before starting a cut, or that a lathe spindle in CSS mode has slowed down after a large to small facing pass before starting the next pass at the large diameter. Many VFDs have an at speed output. Otherwise, it is easy to generate this signal with the HAL near component, by comparing requested and actual spindle speeds.
•  

Moved to "driver boards".

Rod, i did not read your post past "estop-latch is the right way to go", and you know the reason why.
Sorry, this time i should have continued.
Thank you.

Friends, thank you all for your help. I solved the problem through digital outputs and remap.
Something like this -

O<auto_control_off> SUB
  M65 P0
O<auto_control_off> ENDSUB
M2
//

---

O<auto_control_on> SUB
 M64 P0
O<auto_control_on> ENDSUB
M2
//

---

[RS274NGC]
PARAMETER_FILE = linuxcnc.var
RS274NGC_STARTUP_CODE = G21 G40 G90 G94 G97 G64 P0.025

USER_M_PATH =/home/pi/linuxcnc/configs/GRINDER_CNC/macros
SUBROUTINE_PATH =/home/pi/linuxcnc/configs/GRINDER_CNC/macros


REMAP = M20 modalgroup=10 ngc=auto_control_on
REMAP = M21 modalgroup=10 ngc=auto_control_off

But another task appeared - to run scripts for turning off bits when pressing the "Stop" or "Emergency stop" button. It is necessary to stop additional equipment, as for example, the spindle and cooling stop.