Sequential operation of two solenoid valves.

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.