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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