Question about Pixhawk and ESCs connection

Hello all,

I have a question regarding the connection of Pixhawk to ESCS. Do I just need to connect the signal wires of each ESC to the Pixhawk given that the Pixhawk is powered via a power module? The ESCs are powered via the PDB also.

A side question: What is the failure rate of normal ESCs? I worry that I’ve had wrong wiring, but I am curious to hear how often an ESC ends up being faulty for some reason.