Are you preparing for an interview related to PLC or IIoT jobs in the next days and wondering what you should prepare for?
Below are some of the most concerned knowledge based questions:
PLC related questions
- What is sink-source in PLC? How does it affects the PLC wiring?
- How does a PLC processes analog voltage (0-10 VDC or 4-20mA)?
- What is resolution in analog plc cards?
- How does PLC processes high speed inputs?
- What is retentive memory in PLC?
- What is the difference between FC and FB?
- What are tags in PLC?
- What is the difference between Array, Structure and UDT?
- What are the common data types in PLC?
- What is a database? What is the difference between optimised and unoptimisable database (Siemens PLC)?
- What are the various communication protocols of PLC? Which of the communication is the most secure?
- How can two or more PLC’s can communicate with each other?
- What is an HMI and why it is important to use it with PLC?
- What is MODBUS communication and how it can be used with PLC?
- What is MODBUS server and MODBUS client?
- How to read/write an IO-Link device using in PLC?
- How to operate a high ampere rated device using a PLC running on 24VDC?
- What are the various ways to control the servo drives using PLC?
- What are the various ways to control the VFD using PLC?
- What is a telegram in PLC communication (Siemens PLC)?
- What is OPC UA? How can a PLC be connected to OPC UA server?
- If a PLC does not have an OPC UA server inside it, how to link the PLC values to an OPC UA server?
- What is the difference between OPC UA server and OPC UA Client?
- How to connect a PLC to the SCADA software?
- How to create a dashboard for PLC data?
- How to store the PLC data in database like MySQL?
- How to send the PLC data to the MQTT broker?
- How to send the PLC data to the Cloud?
- How can two PLC’s of different manufacturer can communicate with each other?
- How a PLC can communicate with a Robot? Is a PLC necessary to program the Robot?
- How can you simulate a 3D/2D simulation of factory process running with PLC programming?
- How to read write information from a RFID tag?
- How to synchronise the data between two PLC’s such that when the parameters in PLC1 changes, the parameters in PLC2 changes automatically.
- Is it possible to connect two PLC’s to one HMI? Explain
- If a sensor is giving 5V digital output, how it can be read in a PLC?
- What are the important parameters to select a PLC for an application?
- What are various ways to read the PLC data in a mobile application?
- Consider an application where a process involves level control in a tank. The level is controlled via analog valves (filling and draining). The tank level is measured via Ultrasonic sensor. The sensor reading should be stored in MySQL and sent via ClouD to remote location. The remote location should also be able to control the PLC parameters. What are the various hardware and software are required for this application?
- Is it possible to trigger an E-mail when an alarm occurred in a PLC?
- How to push the data from an API into the PLC?
This section will be regularly updated for more questions which you should be prepared to be asked in the job interview
Check out my video on Top 10 PLC queries which might answer one of your queries related to PLC
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I'm Rajvir Singh currently working as Development Engineer in Christiani (Germany). In this channel, you will product reviews and educational videos of the latest automation devices and software. Full-length tutorials you will find at https://learn.codeandcompile.com/ Connect to me via Instagram at www.instagram.com/codencompile LinkedIn: https://www.linkedin.com/in/singhrajvir/ Cheers Rajvir