339
Filling machine
Component explanation:
PLC
component
Control explanation
Mark
X0
Start button, X0 is ON when the button is pressed
ET0
Precise timer
Y0
Control the liquid valve, Y0 ON when the valve
opened, Y0 OFF when the valve closed
Program:
STR
ET0
K3000
X0
RST
ET0
(
S
)
Y0
ET0
(
R
)
Y0
Program explanation:
1.
When X0 is ON, the liquid valve Y0 and precise timer ET0 open at once.
2.
Shut down the liquid valve Y0 and precise timer ET0 when the time arrived.
Example 2
The precise timer interruption can produce the following pulse wave. The Y2 ON time is
500ms, the pulse period is 1000ms.