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Question 69 - ICS-SCADA Cyber Security discussion

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What is used in the Modbus protocol to tell the slave to read or write?

A.
None of these
Answers
A.
None of these
B.
Function code
Answers
B.
Function code
C.
Unit ID
Answers
C.
Unit ID
D.
Slave command
Answers
D.
Slave command
Suggested answer: B

Explanation:

In the Modbus protocol, the function code is used to tell the slave device what kind of action to perform, such as reading or writing data.

Modbus function codes specify the type of operation to be performed on the registers. For example, function code 03 is used to read holding registers, and function code 06 is used to write a single register.

Each function code is a single byte in size and is positioned at the start of the PDU (Protocol Data Unit) in the Modbus message structure, directly influencing how the slave interprets and executes the request.

Reference

'Modbus Application Protocol Specification V1.1b,' Modbus Organization.

'The Modbus Protocol Explained,' by Schneider Electric.

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asked 18/09/2024
SERGIO FREITAS
38 questions
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