Modbus Communication Quiz
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Questions and Answers

Which protocol is widely used in modern SCADA systems?

  • IEC 104 (correct)
  • IEC 101
  • Modbus TCP
  • TCP/IP

What is the reserved TCP port for IEC 104 protocol?

  • 101
  • 104
  • 60870
  • 2404 (correct)

What does a Modbus client use to communicate a specific task to a Modbus server?

  • Function codes (correct)
  • Exception codes
  • Memory type
  • TCP/IP

Which of the following is an example of a common exception code used by a Modbus server?

<p>02; Bad memory address (A)</p> Signup and view all the answers

What does IEC 104 protocol extend from?

<p>IEC 101 protocol (A)</p> Signup and view all the answers

In a Modbus transaction, what can be included?

<p>Single item or multiple items (C)</p> Signup and view all the answers

What memory type can a Modbus client write to or read from?

<p>Specific memory type (C)</p> Signup and view all the answers

What is the purpose of function codes in Modbus communication?

<p>Communicate a specific task to the Modbus server (C)</p> Signup and view all the answers

What did the server indicate with the exception code 01-1 in Modbus communication?

<p>Don't understand this function code (C)</p> Signup and view all the answers

What is the primary task of the Modbus primary in communication with the Modbus secondary?

<p>Communicate a specific task (D)</p> Signup and view all the answers

What is the port number used by IEC 104 protocol for TCP communication?

<p>2404 (D)</p> Signup and view all the answers

What is the main purpose of IEC 104 protocol?

<p>Transport IEC 101 telecontrol messages over TCP (B)</p> Signup and view all the answers

Which region primarily uses DNP3 protocol?

<p>USA (A)</p> Signup and view all the answers

What is the maximum number of objects that can be transmitted in each ASDU of IEC 104 protocol?

<p>127 (D)</p> Signup and view all the answers

What does the Application Protocol Control Information (APCI) of IEC 104 protocol consist of?

<p>Header with protocol control information (B)</p> Signup and view all the answers

Which protocol is the IEC 104 protocol built on top of?

<p>IEC 101 (B)</p> Signup and view all the answers

What is the biggest advantage of IEC 104 protocol?

<p>Enables communication through a standard network for simultaneous data transmission (D)</p> Signup and view all the answers

What is the maximum number of APDUs that can be carried in each TCP payload of IEC 104 protocol?

<p>Depends on the TCP maximum segment size (MSS) (A)</p> Signup and view all the answers

What is the fixed length of the data unit identifier in each ASDU of IEC 104 protocol?

<p>Six bytes (A)</p> Signup and view all the answers

What type of network protocol is IEC 104 protocol?

<p>IP-compliant network protocol (A)</p> Signup and view all the answers

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