I have a fan that rotates at 2800 RPM. I need to make sure that the fan is operating. I need to monitor the fan.
It has an output that gives a signal 2 times per rotation so it's 5600 pulses which is 933 pulses per second. So I guess scan time will be a problem. So I can't use normal inputs. The machine is a Siemens S7-226. I have little experience with PLCs, however I have read the manual on the Siemens 27-2xx and it tells me that there is a high speed counter HSC0. With something like 30KHz so I guess this is what I need, right?
Also, do I just need to count up 5600 every minute to know that my fan is working, reset the counter and then count again? It seems very easy... too easy :) What am I missing?