Mingyu

Thanks Joe, the shaft rpm range is from 1200 to 2700 and I am looking for a 10rpm resolution. I tried using HSC to count pulses every second and then times 60 to get the RPM, but the result is a bit bouncing and the resolution is 60, which is not really good. I was thinking to count period time between pulses. but the timer resolution is 10ms which is not accurate enough. i am wondering if there is any other approach to calculating the RPM in JAZZ PLC.

I have a JAZZ PLC(JZ20-UA24) for our mini turbine application, we were trying to measure the RPM using its high-speed input with the proximity sensor and one magnet, but the problem is the result is too coarse with a 60rpm step. Is there any other method to calculate the rpm based on the high-speed input to get a better accuracy? Is the JAZZ plc able to record the time between two pulses to calculate the RPM? Thank you!