I'm not sure about your application, but remember that in DO-403 modules, the "common" terminal is the positive one, and each load has to be connected between Vsup (+) and Vout (-) , and you don't have to connect all the (-) of the loads toghether, because they're the effective control terminal of the switching. Have you a scheme of your loads connection?
Ravens Fan wrote:
What you show won't work at all.
I'm wondering why... Actually, NI RECOMMENDS to wire Positive voltage to Vsup, but also the scheme with Vsup unwired should work, looking at the internal diagram. The Vout terminal should only switch, from closed to open, on COM terminal. Since COM is wired, it shouldn't matter if Vsup is or not! I'm trying to understand...
On the other hand, I don't know if it'll be good practice to wire a modulatedVoltage to Vsup terminal, form diagram you see a pure DC alim connected to Vsup...