[noob and basic] Fail to send 24V signal to valves with NI 9476

Hello,

I do exactly what he does in this tutorial : https://youtu.be/F-3eX2Qf6pQ

Code is just a while loop with DAQ assistant, nothing else. 

I own the NI 9476 and I am trying to send 24 V to on/off valves. They work if I send them 24 V from another source so the problem comes not from them. The electrician who did the wires told me he put the COM at the 19th place. Like this pineout on the right :

But on the left COM are 17/18, why is there two pineout (left and right) ?

Here is my module :

any idea where the problem comes from ?