tom2378
Guest
T
Hi All,
some PLC analog input modules allow the user to program the output rate from 10Hz to 50/60Hz to 1Khz. I understand why somebody might want to select 50/60Hz to reduce 50/60Hz noise. But why would anybody want to select the higher output rate of 1Khz in cases where the 3dB point of the module is specified as low as 17hz.
Put another way is there a reason why you would want information at a much higher rate than the bandwidth suggests is necessary? Is it something subtle to do with PID loops?
thanks
some PLC analog input modules allow the user to program the output rate from 10Hz to 50/60Hz to 1Khz. I understand why somebody might want to select 50/60Hz to reduce 50/60Hz noise. But why would anybody want to select the higher output rate of 1Khz in cases where the 3dB point of the module is specified as low as 17hz.
Put another way is there a reason why you would want information at a much higher rate than the bandwidth suggests is necessary? Is it something subtle to do with PID loops?
thanks