Using NI 9401 instead of 9472 for PWM

Hello,

Hardware:

cDAQ 9172 Chassis

NI 9219 AI to collect temperatures from type-K thermocouple

NI9472 DO to generate PWM signals from duty cycle of PID loop

My goal of this project is to monitor and maintain a duct heating element.  I am using the PID toolkit to generate the DC for the PWM.  With the NI 9472, I am generating a PWM voltage output proportional to my exterior power supply.  However, if I used the NI 9401, an exterior power supply would be unnecessary thus making my life easier.  

Attached is my VI and jpeg of the VI.  What modifications would I need in order for the 9401 DO to function properly?  I am very new to LabView.

Thanks