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Count milliseconds between two pulses

2/1/2013 2:11 PM	Rate (0)
bjornidar Regular Member Joined: 1/24/2011 Last visit: 9/23/2025 Posts: 4 Rating: (0)	Hi, I'm using inductive sensors on conveyors to both give alarm when no rotation and to calculate the speed of the conveyor. With a gived radius it should be simple with the formula 2pir*number of pulses per second. But this doesn't give me a reliable answer, so I thought I might calculate it by meassuring the time between each pulse. I've been trying with some counter and clock-pulses but with a 100ms clock pulse it won't be accurate. Is it in any way possible to use the system clock to count < 100ms? For example the system time - which is given in hh(0-23):mm(0-59):ss(0-59):ms(0-1000).

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2/4/2013 9:54 AM	Rate (0)
Oscar_83PL Bronze Member Joined: 10/22/2008 Last visit: 9/10/2025 Posts: 377 Rating: (5)	If you have HSC in your PLC you could use measurment of frequency.

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2/6/2013 1:23 PM	Rate (0)
Maselo Experienced Member Joined: 1/12/2011 Last visit: 3/13/2024 Posts: 68 Rating: (0)	Please, check the answer in this thread: /tf/WW/en/Posts/86355

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