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Official ISO
www.linuxcnc.org/iso/linuxcnc_2.9.4-amd64.hybrid.iso

Pretty sure this is all you need
net spindle.0.on hm2_7i76e.0.7i76.0.0.output-11
or this
net solenoid-bearing_air spindle.0.on hm2_7i76e.0.7i76.0.0.output-11

Did you add new limit switch to monitor the cylinder extended position? 

if not, right now you are activating a relay when the cylinder position is in between

(cylinder-position < 900) and (cylinder-position > 1600)

And you would like to stop any axis movement when the above statement is true AND the cylinder-position < 1600?

please upload you hal file and I will add for you some hal code that you can test.

Ah, even easier. Thanks!

Like so ( I would also like to use manually using code, thus mapped to motion pin)?
net solenoid-bearing_air spindle.0.on hm2_7i76e.0.7i76.0.0.output-11 <= motion.digital-out-05

在相同的电脑配置下版本对比2.94版本哪个实时性能更好？
我的电脑配置如下；
cpu i3 9300
主板微星b360M直击炮
内存双通道16G
M.2 256G固态
关闭了睿频，隔离了2—3个内核。
整机配置不到100美元（我是来自中国的数控爱好者）

There is no wiring between the motors and controller: all power and signals pass through the drives. The wiring diagram doesn't help: communication to the control, whether data or discrete signal, isn't explained (i.e. wire xxx connects terminal y1 to x1, but you don't get to know what it does).

Given that I can't actually test the questionable motor properly, I think it may make more sense to replace the motors with modern servo systems.

Thanks for pointing to the Manual, I was not aware that this document changed.

I got it working now. One thing I added was the Airblast when picking up / putting away the tool by rewriting M24 and M25.

However, there is also the Airblast Button in the GUI. Is it actually connected to something?

Another point is that the ATC seems to forget the traverse Feedrate every time I start linuxcnc. When picking up a tool I get the error "Cannot do g1 with zero Feed rate" and have to go into the Rack Setup and click "Update rack parameters" (although the Feedrate is stated correctly here).

I now know that clicking "Ref Rack data"  loads the Tools that are stored in the Rack. Unfortunately, It doesn't use the Tool Table "Rack" coloumn as I understood. 
I assume this would require a Python script to read the tool table and make it usable via Gcode?

Thank you for your patience by the way, really appreciated!

In hal, add the air output pin to spindle-on signal
No remap required.

If it only needs to be on when the spindle is on,
you could do it all in hal with  single statement:

net spindle-air spindle.0.on air-solenoid-drive

(with names other than spindle.0.on changed as desired)