Problem Description: -
The operation of Single acting pneumatic cylinder by
using two pushbuttons PB1 and PB2. PB1 is for start the operation and PB2 is
for stop the operation.
Diagram: -
Here we took Single acting cylinder and
3/2 single solenoid spring return valve now we have to use electric circuit to
operate solenoid.
Program: -
Here is PLC program for making START/STOP pneumatic cylinder operation using PLC.
List of Inputs/Outputs
List
of Inputs
X0: -PB1
X1: -PB2
List
of Outputs
Y0: -Cylinder Relay
output
Ladder Diagram for single acting pneumatic cylinder operation using 3/2 direction control valve.
Program Description: -
-In
the ladder diagram, we use two push button one for start (PB1) and other one to
stop (PB2). And we also use relay for operate solenoid as shown in figure.
-We
give direct 24 voltage to PB1 (NO) and then PB1 normally open contact to PB2
(NC) and then PB2 normally closed contact to the relay.
-Now
we take one normally open contact of relay and give to the PB2 common to give
continuous supply to the relay it is called latching and take second normally
open contact of relay to the solenoid and give 0v to solenoid to complete
circuit.
-Now
when we press PB1 power supply to the relay and relay start. And by starting
relay solenoid is also get power and operate valve. Now if we release PB1 but
power to the solenoid will not stop because of latching.
-Now
when we press PB2 contact will open stop the relay that’s why solenoid is also
stop and cylinder will back at their normal position because of spring return
valve.
By Mansuri Afnan