DVP-ES3 Series Programming Manual Example You can use the DSPD instruction for speed detection where there is an input pulse signal in M0. When M0 is ON, the instruction updates the number of pulses counted by HC200 in D0 every 500ms. In the following example, the value in D0 is 7500 and the actual pulse input frequency of M0 is 15kHz (7500/500ms). _6 6-292