Sequential operation of two solenoid valves.
Application:-Operate two valves in sequence. There are two valves in the
system and we need to operate it in sequence, hence first valve 1 will be on
and after the 20s the second valve will be ON.
Explanation:-
As per the above
application, there are two valves in the system and we need to operate them in
sequence. So when the start switch is pressed valve 1 will be on and the second valve
will on after a 20-second delay. In this case, we need to use on delay tier
because we are giving a delay between two valves.
PLC
program:-
Write the ladder program for the above application using
ladder diagram language. Here for ladder logic, we can use any supported PLC
system like S7-1200, S7-300, S7-1500, or any other PLC which can support this
instruction. For PLC logic we need digital inputs and outputs.
For our application start switch is a digital input
and valves are the digital outputs. To define digital input address and output
address as per below explanation,
Digital
inputs:-
Start switch S1=I0.0
Digital Output:-
Valve 1=Q0.0
Valve 2=Q0.1
PLC
program Explanation:-
In network 1, we have used NO contact of start switch 1 (I0.0), so
when the switch is pressed valve 1 (Q0.0) will be on immediately.
In network 2, we have used No contact of valve 1 (Q0.0) to operate
valve 2 (Q0.1). Here we used on delay timer to provide a delay between two
valves.