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External interrupt using capacitive label sensor with Arduino based PLC


The KSSTI 600/80 FG3LK-IBS is a capasitive level sensor that allows to control when a label is passing through it. This sensor is digital and normally must be handled with interrupts. In this case example is showed how to use this sensor using external interrupts.


Ethernet PLC or 20 I/Os PLC:    Ethernet PLC       20 I/Os PLC

KSSTI 600/80 FG3LK-IBS:   KSSTI 600/80 FG3LK-IBS sensor

Industrial Power supply:   Industrial Shields Accessories

Industrial Shields boards:  Install Industrial Shields boards


KSSTI 600/80 FG3LK-IBS:  

Technical information

Operating principle

Fork opening
0,6 mm

Branch length inside
85 mm

Service voltage
10 ... 35 V DC

No-load current
< 70 mA

Sensitivity adjustment
Teach key + remote teach

Switching output
Push pull, 200 mA, NO/NC, switchable

Other important data:

Label length: > 2 mm

Label interspace:  > 2 mm

Label thickness: < 0,5 mm

Voltage drop: < 2,5 V

Connection: Connector, M12, 4-poled

Connecting cable: VK ...

Drawing :


Final Connection: 


This simple sketch allows us to perform digital reading counting of the KSSTI 600/80 FG3LK-IBS label sensor every 1 sec. For this we have used the input I0.5 of our M-Duino 21+. I0.5 allow external interrupt functionality, so we must add the attachInterrupt() function to set the interrupt functionality. 

As a test we will check the result monitored by the serial port, open the serial monitor to see the counting levels.


   Copyright (c) 2018 Boot&Work Corp., S.L. All rights reserved

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <>.


volatile int counter = 0;

void setup() {
   attachInterrupt(digitalPinToInterrupt(I0_5), count, RISING);
   Serial.println('KSSTI 600/80 FG·LK-IBS started');


void loop() {

void count() {


Capacitive Label sensor using an Arduino based PLC


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