Instrumentation Questions

MODBUS Protocol Quiz :Test Your Knowledge

Test your MODBUS protocol knowledge with this comprehensive quiz designed for automation professionals. This quiz covers key aspects of MODBUS, including function codes, error-checking methods, and communication modes.

Test Your Knowledge: MODBUS Protocol Quiz

Test your MODBUS protocol knowledge with this comprehensive quiz designed for automation professionals. This quiz covers key aspects of MODBUS, including function codes, error-checking methods, and communication modes.

1 / 25

What role does a MODBUS gateway play?

2 / 25

What is the primary advantage of using MODBUS over TCP/IP compared to MODBUS RTU?

3 / 25

How is floating-point data typically represented in MODBUS?

4 / 25

Which of the following statements is true about MODBUS Exception Codes?

5 / 25

What type of devices can act as a MODBUS master?

6 / 25

How is data transmitted in MODBUS TCP/IP?

7 / 25

In a MODBUS message, what follows the function code?

8 / 25

What is the function code for reading holding registers?

9 / 25

What does the term ‘PDU’ stand for in MODBUS communication?

10 / 25

Which function code is used to write multiple registers in MODBUS?

11 / 25

What is the primary difference between MODBUS RTU and MODBUS ASCII?

12 / 25

Which of the following is true about MODBUS over serial communication?

13 / 25

In MODBUS communication, what does the term ‘coil’ refer to?

14 / 25

Which of the following is NOT a valid MODBUS function code?

15 / 25

How many bits are in a MODBUS RTU byte?

16 / 25

What is the maximum number of coils that can be read in a single MODBUS request?

17 / 25

Which MODBUS function code is used to read input registers?

18 / 25

What is the purpose of a Unit Identifier in MODBUS TCP/IP?

19 / 25

In MODBUS ASCII mode, what character marks the start of a frame?

20 / 25

Which MODBUS function code is used to write a single coil?

21 / 25

What type of error-checking does MODBUS RTU use?

22 / 25

Which of the following MODBUS function codes is used to read discrete inputs?

23 / 25

In MODBUS RTU mode, how is the end of a message frame determined?

24 / 25

What is the default port number for MODBUS TCP/IP?

25 / 25

Which layer of the OSI model does the MODBUS protocol primarily operate on?

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Sundareswaran Iyalunaidu

With over 24 years of dedicated experience, I am a seasoned professional specializing in the commissioning, maintenance, and installation of Electrical, Instrumentation and Control systems. My expertise extends across a spectrum of industries, including Power stations, Oil and Gas, Aluminium, Utilities, Steel and Continuous process industries. Tweet me @sundareshinfohe

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