Delta Electronics Programmable Logic Controller DVP-PLC User Manual

Page 466

8 Application Instructions API 100-149

DVP-PLC Application Manual

8-64

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:

D0=k40

D0=k20

D0=k30 D0=k10

4sec

2sec

1sec

2sec

CVM

K50

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

4 seconds.

2) Phase

: Change the position of the valve and D0 = K20. Due to that the previous position was at 4

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).

Program Example 2:

1. Timing diagram and program of the control:

D0=k40

D0=k10

4sec

2sec

5sec

D0=1