DVP-ES3 Series Programming Manual Example 2 In the beginning, M0 is OFF; therefore, M20 is ON, and M21 is OFF. When X0 switches from OFF to ON for the first time, M10 is ON; therefore, M20 is OFF, and M21 is ON. When X0 switches from OFF to ON for the second time, M10 is OFF; therefore, M20 is ON, and M21 is OFF. Example 3 _6 When M0 is ON, T0 generates a pulse every two seconds. The output M20 alternates between ON and OFF according to the pulses generated by T0. 6-180