Why can't I program the Pulse Width MOdulation Function Block in SoMachine Basic ver 1.3?

If the function block is bank when inserted into a rung, the Pulse Generators have not been setup in your Configuration. In the Configuration Tab under "My Controller" select "Pulse Generators" Select %PWM0 configuration and set the Time base and Preset for the pulse generator. Select apply and now you can use the function block in your logic.