8 Application Instructions API 100-149 2. Definitions of the control valve: a) When Y0 and Y1 = Off: No valve action b) When Y0 = On and Y1 = Off: Valve “open” c) When Y0 = Off and Y1 = On: Valve “closed” d) When Y0 and Y1 = On: The action is prohibited. 3. Timing diagram and program of the control: 5 M0 Y0 4sec 1sec Y1 2sec 2sec D0=k40 D0=k20 D0=k30 D0=k10 1 2 3 4 M0 4. Control phases: 1) Phase : When M0 = On, D0 = K40 refers to the valve shall be open (Y0 = On, Y1 = Off) till the position of 2) Phase : Change the position of the valve and D0 = K20. Due to that the previous position was at 4 4 seconds.
seconds, the valve shall be closed (Y0 = Off, Y1 = On) for 2 seconds, moving the valve to the position of 2 seconds. 3) Phase : Change the position of the valve and D0 = K30. Due to that the previous position was at 2 seconds, the valve shall be open (Y0 = On, Y1 = Off) for 1 second, moving the valve to the position of 3 seconds. 4) Phase : Change the position of the valve and D0 = K10. Due to that the previous position was at 2 seconds, the valve shall be closed (Y0 = Off, Y1 = On) for 2 seconds, moving the valve to the position of 1 second. 5) Phase : Switch off X0 and no actions at the valve (Y0 = Off, Y1 = Off). DVP-PLC Application Manual 8-68 CVM D0 K50 Y0