Runtime Test Cases
Inputs
Outputs
Physical Elements
I:1/0 = 1 O:2/0 = O:2/1 = O:2/2 = 1 Activate Clamper, ON Motor, Energize Motor Down
I:1/1 = 1 O:2/0 = 0, O:2/2 = 0 Deactivate Clamper, De-Energize Motor Down
I:1/1 = 1 O:2/3 = 1
Energize Motor Up Coil
I:1/2 = 1 O:2/3 = 0
De-Energize Motor Up Coil, OFF Motor
PLC Program to Control the Sequence of Conveyors and Interlocking
Them
This is a PLC Program to Control the Sequence of Conveyors and Interlocking Them.
Problem Description
A feeder drops material on the conveyor which sends material for further process through one more
conveyor. Conveyor must start automatically when material is dropped on it. Implement automation of this
in PLC using Ladder Diagram programming language.
Problem Diagram
Problem Solution
Feeder has a motor mounted to feed material on conveyor belts.
Load cells are installed at the bottom of conveyor belts to detect if material is present on the conveyor belt.
When material falls on conveyor belt 1, motor 1 should start, and when material in present on conveyor belt
2, motor 2 remain On.
Switches can also be used sometimes to detect material’s presence. But for more reliable operation, Load
cells can be used as shown in the diagram above.
PLC Program
Here is PLC program to Control the Sequence of Conveyors and Interlocking Them, along with program
explanation and run time test cases.
List of Inputs and Outputs
I:1/0
= Start
(Input)
I:1/1
= Stop
(Input)
I:1/2
= Load cell of conveyor 1
(Input)
I:1/3
= Load cell of conveyor 2
(Input)
O:2/0
= Latching Coil
(Output)
O:2/1
= Motor 3 (feeder)
(Output)
O:2/2
= Motor 1 (Conveyor 1)
(Output)
O:2/3
= Motor 2 (Conveyor 2)
(Output)
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