BLYNK App -09

Inductive Proximity Sensor Interfaced with Arduino, Node MCU, ESP32 to count metal objects

Inductive proximity sensors are solely for the detection of metal objects. They basically comprise an oscillator whose windings constitute the sensing face. An alternating magnetic field is generated in front of these windings. Inductive proximity sensors can only detect metal targets. They do not detect non-metal targets such as plastic, wood, paper, and ceramic. Unlike photoelectric sensors, this allows a inductive proximity sensors to detect a metal object through opaque plastic.

Can Counting Sensor: For counting metallic cans on conveyor belts

The counting of cans in the process is accompanied by other eff ects such as shaking, jiggling and in some cases also reverse movement or jumping of individual cans or multiple cans. An additional complication is the round shape of the cans

Our can count sensors have it all under control! The compact device counts cans made from aluminium or tin-plate, from 52 mm to 86 mm diameter – without remote station or double head. It uses our clever Teach-In function and counts cans with a speed of up to 6000 units per minute – with absolute precision. Each can is counted just once – even if it passes the sensor again in reverse direction.

Advantages:

Without remote station or double head
No recount if the can passes the sensor again after a reverse
Can counting of up to 6,000 pieces/min.
Can diameter 53 to 86 mm
Outputs for 1/1, 1/2, 1/10 sockets
Adjustable with teach-in function
Aluminium and tinplate cans
No second sensor is required

PLC Program for Counting Moving Objects on Conveyor

This is a PLC Program to implement a program for counting objects on the moving conveyor.
Table of Contents
Counting Moving Objects on Conveyor
Problem Diagram
Problem Solution
List of Inputs and Outputs
PLC Ladder Logic for counting Objects on the conveyor
Ladder Logic Explanation
Result
PLC Program to Count and Pack Boxe…
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Counting Moving Objects on Conveyor
Objects are moving on the conveyor. We need to count the total number of objects collected at the end of conveyor and display it on the local control panel.
Write a PLC program for this application.

Problem Solution

Here we use PLC ladder program to implement this logic.

Mostly proximity sensors are used to detect the objects. Here we mount proximity sensor to detect the parts or objects moving on the conveyor.

Inductive sensor are mostly used to detect metal objects. For other type of objects, we use Capacitive proximity sensor for detecting the objects moving on the conveyor. We connect this sensor to the PLC and by using counter logic,we will count the number of objects and display the total number on the local control panel display.

Here we use UP counter for counting the collected Objects at the end of conveyor.

Note:- Here we considered simple application for counting objects. We considered proximity sensor for detecting the objects. Proximity sensor will sense the object and PLC UP counter will count the collected objects.

List of Inputs and Outputs

Digital Inputs
Start :- I0.0
Stop :- I0.1
Proximity :- I0.2 (Objects detection)
Counter Reset PB :- I0.3
Digital Output
Cycle ON :- Q0.0
M memory
Counter Reset :- M0.1
Total Objects collected :- MW10
PLC Ladder Logic for counting Objects on the conveyor
Ladder Logic Explanation
For this application, we use S7-300 PLC and TIA portal software for programming. We can implement this logic by using other PLC also.

Network 1:

In first network we used latching circuit for cycle ON. Here we used START PB (I0.0 ) to start the cycle and STOP PB (I0.1) to stop the cycle.

Network 2:

PLC Counter instruction is used to count the number of objects. Proximity sensors are mounted near to the conveyor.

When an object comes near to the proximity sensor (I0.2), it will detect the object and output of the sensor becomes energize or changes to ON state.

When there will be no object near to the proximity sensor then output of sensor becomes de-energize or changes to OFF state.

PLC counter counts in the incremental way. Total counted Objects number will be stored in the memory word or register (MW10).

Note :- Above application may be different from actual application. This example is only for explanation purpose only. We can implement this logic in other PLC also. This is the simple concept of UP counter. By using this concept we can count objects moving on the conveyor or any other counting application. This logic is only part or for specific application logic only.

All parameters considered in example are for explanation purpose only, parameters may be different in actual applications.

Inductive Proximity Sensor Interfaced with Arduino, Node MCU, ESP32 to count metal objects

Avinya-networks (A unit of PAM Electronics)

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