Dhanaprakash Industrial PLC Programmer Interview Questions, Process, and Tips

Basic plc programming , techincal question about instrumentation

Q1. What is plc ?
Ans. 
PLC stands for Programmable Logic Controller, a digital computer used for automation of electromechanical processes.
• PLC is used to control machinery in industries such as manufacturing, automotive, and food processing.

• It uses a programmable memory to store instructions and execute specific functions.

• PLCs are designed to withstand harsh industrial environments and operate reliably for long periods of time.

• They are progr...read more
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Q2. How much io plc programming you do in past ?
Ans. 
I have extensive experience in IO PLC programming, including designing, implementing, and troubleshooting various input/output systems.
• Designed and implemented IO systems for manufacturing processes

• Troubleshooted communication issues between PLC and IO devices

• Optimized IO configurations for improved efficiency

• Integrated new IO devices into existing PLC systems
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Q3. What is timer and counters ?
Ans. 
Timers and counters are essential components in PLC programming used to control the timing and counting of processes.
• Timers are used to control the timing of events in a PLC program.

• Counters are used to keep track of the number of times an event has occurred.

• Timers can be on-delay, off-delay, or retentive, depending on the application.

• Counters can be up counters, down counters, or up/down counters.

• Examples: On-delay ti...read more
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Q4. What is plc scan time and how plc works ?
Ans. 
PLC scan time is the time taken by a PLC to complete one cycle of scanning and executing the program logic.
• PLC scan time is influenced by the complexity of the program, number of inputs/outputs, and processing speed of the PLC.

• It is important to keep the scan time as short as possible to ensure real-time control of processes.

• PLC works by continuously scanning inputs, executing the program logic, and updating outputs ba...read more
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Q5. Which type of sensors use in heating equipment ?
Ans. 
Various types of sensors are used in heating equipment, including temperature sensors, pressure sensors, flow sensors, and level sensors.
• Temperature sensors are commonly used to monitor and control the temperature of heating equipment.

• Pressure sensors can be used to ensure proper pressure levels within the heating system.

• Flow sensors help in regulating the flow of fluids within the equipment.

• Level sensors are used to m...read more
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