# Industrial Automation **URL:** https://forumautomation.com/c/interview-questions-and-answers/industrial-automation/36.md [Latest](https://forumautomation.com/latest.md) · [Categories](https://forumautomation.com/categories.md) · [Tags](https://forumautomation.com/tags.md) --- ## [About the Industrial Automation category](https://forumautomation.com/t/about-the-industrial-automation-category/1313)
**Author:** [@Administrator](https://forumautomation.com/u/Administrator)\ **Replies:** 0
Industrial Automation Interview Questions and Answers --- ## [What are Risk Factors? Why Risk Factors are important?](https://forumautomation.com/t/what-are-risk-factors-why-risk-factors-are-important/13333)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [June 19, 2025, 12:31pm UTC](https://forumautomation.com/t/what-are-risk-factors-why-risk-factors-are-important/13333 "2025-06-19T12:31:18Z")
What are Risk Factors? Risk factors determine the likelihood (probability) and impact of a risk. Risk factors include both Positive risks and Negative risks. Why Risk Factors are Important? Facilitate complete risk… --- ## [What is a Fire Alarm Cable?](https://forumautomation.com/t/what-is-a-fire-alarm-cable/13247)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [May 17, 2025, 3:54am UTC](https://forumautomation.com/t/what-is-a-fire-alarm-cable/13247 "2025-05-17T03:54:20Z")
What is a Fire Alarm Cable? --- ## [What is a Historian in SCADA?](https://forumautomation.com/t/what-is-a-historian-in-scada/12879)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 0\ **Last updated:** [December 4, 2024, 7:26am UTC](https://forumautomation.com/t/what-is-a-historian-in-scada/12879 "2024-12-04T07:26:22Z")
What is a Historian in SCADA? A SCADA historian is a specialized software program made to gather, store, and handle historical process data from many SCADA system sources. It allows users to access and examine past d… --- ## [What is control valve timing with the advantages and disadvantages?](https://forumautomation.com/t/what-is-control-valve-timing-with-the-advantages-and-disadvantages/12822)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [November 18, 2024, 2:13pm UTC](https://forumautomation.com/t/what-is-control-valve-timing-with-the-advantages-and-disadvantages/12822 "2024-11-18T14:13:23Z")
What is control valve timing with the advantages and disadvantages? --- ## [What is PID controller vs MPC controller?](https://forumautomation.com/t/what-is-pid-controller-vs-mpc-controller/12805)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [November 12, 2024, 1:56pm UTC](https://forumautomation.com/t/what-is-pid-controller-vs-mpc-controller/12805 "2024-11-12T13:56:31Z")
What is PID controller vs MPC controller? --- ## [What is RS-485, and why is it commonly used in industrial applications?](https://forumautomation.com/t/what-is-rs-485-and-why-is-it-commonly-used-in-industrial-applications/12721)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [October 25, 2024, 4:36am UTC](https://forumautomation.com/t/what-is-rs-485-and-why-is-it-commonly-used-in-industrial-applications/12721 "2024-10-25T04:36:27Z")
What is RS-485, and why is it commonly used in industrial applications? --- ## [What does LoRaWAN stand for? What is the principle of LoRaWAN?](https://forumautomation.com/t/what-does-lorawan-stand-for-what-is-the-principle-of-lorawan/12677)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [October 14, 2024, 12:50pm UTC](https://forumautomation.com/t/what-does-lorawan-stand-for-what-is-the-principle-of-lorawan/12677 "2024-10-14T12:50:46Z")
What does LoRaWAN stand for? What is the principle of LoRaWAN? --- ## [What is Protocol?](https://forumautomation.com/t/what-is-protocol/12602)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [September 20, 2024, 12:20pm UTC](https://forumautomation.com/t/what-is-protocol/12602 "2024-09-20T12:20:10Z")
What is Protocol? --- ## [Modbus RTU vs Modbus TCP](https://forumautomation.com/t/modbus-rtu-vs-modbus-tcp/12456)
**Author:** [@automation\_engineer6](https://forumautomation.com/u/automation_engineer6)\ **Replies:** 1\ **Last updated:** [September 12, 2024, 1:47pm UTC](https://forumautomation.com/t/modbus-rtu-vs-modbus-tcp/12456 "2024-09-12T13:47:58Z")
--- ## [How often should a burner controller be inspected or calibrated?](https://forumautomation.com/t/how-often-should-a-burner-controller-be-inspected-or-calibrated/12340)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [August 6, 2024, 5:17pm UTC](https://forumautomation.com/t/how-often-should-a-burner-controller-be-inspected-or-calibrated/12340 "2024-08-06T17:17:51Z")
How often should a burner controller be inspected or calibrated? --- ## [A new software: AWA-Core](https://forumautomation.com/t/a-new-software-awa-core/12251)
**Author:** [@ForTiLab](https://forumautomation.com/u/ForTiLab)\ **Replies:** 0\ **Last updated:** [July 5, 2024, 7:23am UTC](https://forumautomation.com/t/a-new-software-awa-core/12251 "2024-07-05T07:23:12Z")
To all Automation Engineers, Instrument Specialists, Process Managers… An “historian”, a report generator, scripts, graphics, hypervision, data-loggers combined in a single Software. But also dynamic Excel tables, progr… --- ## [Communication between OPC DA and OPC client](https://forumautomation.com/t/communication-between-opc-da-and-opc-client/7019)
**Author:** [@Anas\_1990](https://forumautomation.com/u/Anas_1990)\ **Replies:** 2\ **Last updated:** [February 25, 2023, 7:55pm UTC](https://forumautomation.com/t/communication-between-opc-da-and-opc-client/7019 "2023-02-25T19:55:23Z")
Dears, I have three different PLCs in my company .they share data with our central unit using GPRS network and using OPC DA for each Brand. I want to know if it’s possible to develop one OPC client to share data providi… --- ## [Maple Systems HMI send ASCII message to Vorne board via Serial](https://forumautomation.com/t/maple-systems-hmi-send-ascii-message-to-vorne-board-via-serial/8161)
**Author:** [@JamesProtheroe](https://forumautomation.com/u/JamesProtheroe)\ **Replies:** 1\ **Last updated:** [July 6, 2021, 7:59am UTC](https://forumautomation.com/t/maple-systems-hmi-send-ascii-message-to-vorne-board-via-serial/8161 "2021-07-06T07:59:16Z")
I am trying to send ASCII messages over serial from a Maple systems model: HMI5121P to an older Vorne Industries serial input alphanumeric display board model: GY2200. Has anyone done this? Any guidance would be greatly … --- ## [Flex feeder vibration for movement position and displacement](https://forumautomation.com/t/flex-feeder-vibration-for-movement-position-and-displacement/8965)
**Author:** [@ricardo1998](https://forumautomation.com/u/ricardo1998)\ **Replies:** 0\ **Last updated:** [December 15, 2020, 6:53pm UTC](https://forumautomation.com/t/flex-feeder-vibration-for-movement-position-and-displacement/8965 "2020-12-15T18:53:08Z")
How does the flex feeder vibration to move and control de position of differentes componentes or pieces is made? --- ## [PLC (Programmable Logic Control) Interview questions](https://forumautomation.com/t/plc-programmable-logic-control-interview-questions/3319)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 1\ **Last updated:** [April 13, 2018, 3:20am UTC](https://forumautomation.com/t/plc-programmable-logic-control-interview-questions/3319 "2018-04-13T03:20:42Z")
1. What is PLC? It is a class of industrially hardened devices that provides the hardware interface for input sensors and output control element. The field I/p include element like limit switches, sensors, push button an… --- ## [CLASSIFICATION OF MICROCONTROLLER AND ITS DIFFERENCE BETWEEN MICROPROCESSOR](https://forumautomation.com/t/classification-of-microcontroller-and-its-difference-between-microprocessor/6009)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [March 3, 2019, 5:36am UTC](https://forumautomation.com/t/classification-of-microcontroller-and-its-difference-between-microprocessor/6009 "2019-03-03T05:36:55Z")
MICROCONTROLLER A microcontroller is a system on a chip (SOC) it has CPU, I/O ports, timers, RAM, ROM on a single chip or it is like integrated on a single chip. Microcontrollers are designed fo… --- ## [Interview Question for Automation,DCS,PLC Engineers](https://forumautomation.com/t/interview-question-for-automation-dcs-plc-engineers/215)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 11\ **Last updated:** [October 21, 2017, 11:54am UTC](https://forumautomation.com/t/interview-question-for-automation-dcs-plc-engineers/215 "2017-10-21T11:54:04Z")
Draw system architecture showing PLC, SCADA/MMI, networking devices communication protocol details like IP address etc. Draw detailed block diagram of any field parameter like temp, pressure reading coming to PLC can be… --- ## [What is eddy current sensor technology and its applications?](https://forumautomation.com/t/what-is-eddy-current-sensor-technology-and-its-applications/4668)
**Author:** [@rajeena](https://forumautomation.com/u/rajeena)\ **Replies:** 0\ **Last updated:** [September 17, 2018, 1:50pm UTC](https://forumautomation.com/t/what-is-eddy-current-sensor-technology-and-its-applications/4668 "2018-09-17T13:50:29Z")
What is an eddy current sensor technology and its applications? How is eddy current formed? The eddy current sensors are used to measure displacement to a nanometer. The eddy current technology uses non-contact displacem… --- ## [Why are control valves sometimes very noisy?](https://forumautomation.com/t/why-are-control-valves-sometimes-very-noisy/4569)
**Author:** [@rajeena](https://forumautomation.com/u/rajeena)\ **Replies:** 0\ **Last updated:** [September 6, 2018, 4:33pm UTC](https://forumautomation.com/t/why-are-control-valves-sometimes-very-noisy/4569 "2018-09-06T16:33:50Z")
Why are control valves sometimes very noisy? Control valves regulate flow by increasing or decreasing the fluid pressure drop across an element. These pressure drop adjustments are usually accompanied by noise generation… --- ## [PLC interview questions](https://forumautomation.com/t/plc-interview-questions/3366)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [April 2, 2018, 5:24pm UTC](https://forumautomation.com/t/plc-interview-questions/3366 "2018-04-02T17:24:38Z")
1. What is PLC? Answer: PLC means Programmable Logic Controller. It is a class of industrially hardened devices that provides hardware interface for input sensors and output control element. The field I/p include elemen… --- ## [Power plant engineering based Interview question](https://forumautomation.com/t/power-plant-engineering-based-interview-question/3239)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [March 5, 2018, 3:16pm UTC](https://forumautomation.com/t/power-plant-engineering-based-interview-question/3239 "2018-03-05T15:16:09Z")
1. What are major circuits in a steam power plant? Feed water and steam circuit Air and fuel gas circuit Cooling water circuit Coal and ash circuit 2. What is penstock? The pipe between surge tank and prime… --- ## [What is Multivariable control system?](https://forumautomation.com/t/what-is-multivariable-control-system/2498)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [October 22, 2017, 10:18pm UTC](https://forumautomation.com/t/what-is-multivariable-control-system/2498 "2017-10-22T22:18:22Z")
Multivariable Control System Multivariable control system define a system in which the variable the variable interacts strongly. This kind of system must have more than one input and more than one output. A disturbance … --- ## [PLC engineer interview question?](https://forumautomation.com/t/plc-engineer-interview-question/478)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 1\ **Last updated:** [February 12, 2018, 12:25pm UTC](https://forumautomation.com/t/plc-engineer-interview-question/478 "2018-02-12T12:25:49Z")
PLC programmer / PLC engineer interview questions What is sinking input and sourcing input/Output ? Sinking input / output provides a grounded connection to the load Sourcing input / output provides to the load 2.Wh… --- ## [What are the advantages & disadvantages of PLC?](https://forumautomation.com/t/what-are-the-advantages-disadvantages-of-plc/2430)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [October 11, 2017, 4:14pm UTC](https://forumautomation.com/t/what-are-the-advantages-disadvantages-of-plc/2430 "2017-10-11T16:14:12Z")
Advantages: Small physical size & shorter project time. Cost effective for controlling complex system. Reliability. Less and simple wiring. Faster response. Remote control capability. More flexibility… --- ## [What is control loop ? What are the two types of control loop?](https://forumautomation.com/t/what-is-control-loop-what-are-the-two-types-of-control-loop/2413)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [October 9, 2017, 12:43am UTC](https://forumautomation.com/t/what-is-control-loop-what-are-the-two-types-of-control-loop/2413 "2017-10-09T00:43:19Z")
What is a control loop? Control loop is a group of components working together as a system to achieve and maintain the desired value of a system variable by manipulating the value of another variable in the control loop… --- ## [Common Interview Questions: Industrial Automation](https://forumautomation.com/t/common-interview-questions-industrial-automation/140)
**Author:** [@instrumen](https://forumautomation.com/u/instrumen)\ **Replies:** 4\ **Last updated:** [June 3, 2017, 9:49am UTC](https://forumautomation.com/t/common-interview-questions-industrial-automation/140 "2017-06-03T09:49:06Z")
1.Explain Cascade Control system with a diagram. What would happier if a single controller were used ? 2. Explain ratio control system. 3. Explain fuel to air ratio control of furnaces. 4. What is Furnace Draft control ?… --- ## [What is Normally Open and Normally Close switch ? How to implement logic gates with NO and NC switch?](https://forumautomation.com/t/what-is-normally-open-and-normally-close-switch-how-to-implement-logic-gates-with-no-and-nc-switch/1751)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [February 12, 2017, 7:23pm UTC](https://forumautomation.com/t/what-is-normally-open-and-normally-close-switch-how-to-implement-logic-gates-with-no-and-nc-switch/1751 "2017-02-12T19:23:08Z")
Boolean logic is represented by two states. True = 1 False = 0 This is also known as a digital state. Normally Open Switch State 0 When the switch has no information or a reading of ‘false’ or ‘0’ state,then no i… --- ## [What is On-Delay and Off Delay timer](https://forumautomation.com/t/what-is-on-delay-and-off-delay-timer/1750)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [February 12, 2017, 4:52pm UTC](https://forumautomation.com/t/what-is-on-delay-and-off-delay-timer/1750 "2017-02-12T16:52:38Z")
Timer are used in PLC program to introduce some delays in a logic transition. On-Delay Timer For an On-delay timer two different types of contact. NOTC - Normally opened,timed -closed. This timer is normally open and… --- ## [Which communication networks can be used to transfer data between central host computer and field based RTU?](https://forumautomation.com/t/which-communication-networks-can-be-used-to-transfer-data-between-central-host-computer-and-field-based-rtu/1385)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 1\ **Last updated:** [November 15, 2016, 5:06pm UTC](https://forumautomation.com/t/which-communication-networks-can-be-used-to-transfer-data-between-central-host-computer-and-field-based-rtu/1385 "2016-11-15T17:06:00Z")
Communication networks used to transfer data between RTU and main computer are 1.Twisted Pair metallic cable 2.Coaxial metallic cable 3.Fiber optic cable 4.Power line carrier 5. Satellite 6.Leased telephone line 7.Very … [Next page](https://forumautomation.com/c/interview-questions-and-answers/industrial-automation/36.md?page=1)