Ssr control without the use of pwm

i want to control the heater and a DC motor using the SSR. on checking for the solution i find that PWM with varing duty cycle is the best option but i don't know nothing about PWM and also how to program it on LabVIEW. i have a NI 9403 and NI 9478 DAQcard and other AI/AO cards. i am thinking of controlling the SSR using one of these cards. i am trying to use a simulated signal block (LabVIEW 2010) square wave, try to vary its duty using a PID. now the question is how to send this simulated signal to the SSR using the Available DAQ cards with me. i want to skip usage of PWM because i dont have the time. i want to start the experiments as fast as possible.

this is the vi that i am using to control the heater for temperature control. the DAQ assistant is measuring the temperature using NI 9211 and this temperature is matched with the set point and adjust the duty cycle of the simulated signal, (square wave just like PWM),
i am not actually using a PWM just creating something like PWM, the frequency that i have set is just a hit and trail (i dont know how much to set).
the DAQ assistant2 controls the SSR which in turn ON/OFF the heater according to duty cycle.it's working fine. the same concept i am trying to use in the case of controlling the RPM of a DC motor.
the rpm from the motor controller, that i have, will be fixed to 100 rpm. i will set the setpoint to 60 RPM in the PID, the PID will vary the duty cycle of the simulated signal and will controll the RPM but the question now arise is:
1) from the experience obtained from heater control that i had done, there will be no current flowing to the DC motor because the SSR get fully closed (duty cycle 0) as soon as the process variable goes above the setpoint (60 RPM) and again opens to full (duty cycle 100) as it falls below the set point. i want it to at 50% duty cycle at at set point(60 RPM)  and as the RPM decreases it should increase the Duty cycle to adjust the RPM back to 60.
2) now how to acheive this.
i am simultaneously measuring the current and voltage that is going to the DC motor. if the duty cycle goes to zero ( SSR gets closed), i will not be able to measure the current and voltage going to the DC motor. that's why i want the duty cycle to be at 50%.
Attachments:
8 june pid cntrol heater.vi ‏127 KB

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