Test LinuxCNC without motors and encoders connected

It looks scary to connect Mesa to the servo's mounted on the machine for the fire time.
It is probably wise to remove the servo's during a test run

Absolutely, you should _expect_ runaways on initial testing, so if you can
its a very good idea to de-couple the motors from the linear axis.

Runaways are a lot less dramatic if the motor just spins at
full speed rather than breaking expensive parts or hurting someone...

This is also an important reason to have sensible following error limits
and have the drive enables working _before_ you connect the servos
to the linear axis.

Next Question

I've added a 7i84 to the 5i25 - 7i77 set.
The connection has been done via a cut UTP cable.
The field power is also connected.
I ran the PNCconf again, after backing up my old files.
I was able to add the 7i84 card during the configuration. A 7i84 I/0 tab was added.
To see how the "name" was, I've configured a input (cycle machine) and a output (eStop on).
After this I've looked in the INI and HAL find for the changes I've made, and made the changes to the new INI and HAL file.
But now LinuxCNC will not start

The error message is:
Pin "hm2_5i25.1.7i84.0.2.output-00" does not exist.

What is my problem?

Do you have VIN jumper in left position and both ( A and B ) 7I84 field powers connected?
Do you have 2 yellow and 1 red light on the 7I84 before you start?

Yes,

before start 2 yellow and 1 red
after startup 2 yellow and 1 blinking green

Both field powers connected, VIN W1 is on the left position

Ok, Now it is starting.

I found in the Hall Meter that it has to be :
hm2_5i25.0.7i84.0.2.output-00
in stead of
hm2_5i25.1.7i84.0.2.output-00

LinuxCNC is running again