Using PCI CTR 05 board with xPC target

I am using xPC target along with a board made by Measurement
Computing, namely the PCI-CTR 05. I need to generate PWM signals by
giving the duty cycle as the input. I am using the block available in
simulink for this purpose. But, I get a PWM output only if I use duty
cycles in the range between 0.4 and 0.6. Any duty cycle less than 0.4
or greater than 0.6 does not give me the PWM output signal. I want to
know why this is happening since I need the entire range of duty
cycle from 0 to 1 for my work. Thanks.
.

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