Problem Description

Runtime Test Cases
Inputs
Outputs
Physical Elements
I:1/14 = 1
O:2/0 = 1
Start separation process
I:1/0 = 1
O:2/1 = 1
Energize solenoid gate
T4:0/DN = 1
O:2/1 = 0
De-energize solenoid gate
PLC Program to Control Spray-Painting of Parts
This is a PLC Program to Control Spray-Painting of Parts.
Problem Description
Control Spray-Painting operation in PLC using Ladder Diagram programming language.
Problem Diagram
Problem Solution

Spray-Paining operation is similar to the bottle capping operation. The only difference is that Bottle Capping
operation used timers while Spray-Paining operation do not require timers.

Two limit switches are used, one to detect hangers and other to detect parts.

Both are mounted exactly opposite to each other so that when part is not present, outputs are complement
of each other.

---


Bit shift register is used to spray parts.

Oven is used to dry the parts after they are sprayed. This output is continuously ON and is not controlled.
PLC Program
Here is PLC program to Control Spray-Painting of Parts, along with program explanation and run time test
cases.
List of Inputs and Outputs
I:1/14 = Start
(Input)
I:1/15 = Stop
(Input)
I:1/0
= Limit switch (Hanger)
(Input)
I:1/1
= Proximity (Part detection)
(Input)
O:2/0
= Master coil / Run
(Output)
O:2/1
= Oven
(Output)
O:2/2
= Spray
(Output)
BSL
= Bit shift left instruction
(Logical)
B3:0
= Bit shift Register
(Register)
B3:0/2 = Bit to energize capping machine (Bit)
R6:0
= Control register
(Register)