You dont need that as the C10 has internal pullup/pulldowns.

If you want to wire the servo alarm back then do this (this assumes you are wiring limit and estop as shown in the wiring diagram you sent - so the jumper X5 is set for 'pull down'

x/25 -> BOB 5v connection near 11
X/26 -> y/25
y/26 -> z/25
z/26 -> a/25
a/25 -> BOB/11

This will show an active HIGH signal when all three servos are OK, and a LOW when one or more servos alarm. This is the same polarity as the e-stop and limit switches.