Problem Description

Problem Diagram
Problem Solution

To sense the bottle, proximity sensor is used.

Used a timer to stop the cylinder motor for 2secs to screw caps.

Used one more timer to run the motor for 1sec to rotate the cylinder.

Bit Shift register is also used to perform this operation.

Count the number of steps capping machine is placed from the sensor and set bit position to operate
capping machine accordingly.

In this example as you can see, bottle is 7 steps away from the proximity switch, so if Bit register B3:0 is
used, then capping machine should be operated when B3:0/0 is shifted to B3:0/6.

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
Two inputs are given to this Capping machine, electric supply to run motor and pneumatic supply to push
machine down cap ram.
PLC Program
Here is PLC program to Perform Bottle’s Capping with Rotating Mechanism, 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
= Proximity
(Input)
O:2/0
= Master coil / Run
(Output)
O:2/1
= Cylinder motor
(Output)
O:2/2
= Electric supply to capping machine motor
(Output)
O:2/3
= Pneumatic supply to cap ram
(Output)
BSL
= Bit shift left instruction
(Logical)
B3:0
= Bit shift Register
(Register)
B3:0/6 = Bit to energize capping machine
(Bit)
R6:0
= Control register
(Register)
T4:0
= Timer to run cylinder motor
(Timer)
T4:1
= Timer to stop cylinder motor timer for capping (Timer)
LIM
= Limit output to perform capping (Compare)

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