Relay type output can use PWM function?
1, Smart specification, as shown in figure 1.
2, pulse width modulation (PWM) output cycle. If the time is millisecond range allowed is 2 to 65535; if the time is microseconds, range allowed is 10 to 65535.
PWM belong to the pulse output, can not be used to see your output frequency high or low! Since you want to use PWM want to output frequency is not low, then it is not recommended to use the relay type output PWM function!