Modbus TCP Protocol Quiz
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Questions and Answers

What is the reserved port for Modbus TCP?

  • Port 8080
  • Port 502 (correct)
  • Port 8000
  • Port 80

    • When was the Modbus protocol originally published?

  • 1979 (correct)
  • 1965
  • 1995
  • 1985

    • What does Modbus TCP/IP refer to?

  • Modbus protocol with a TCP interface (correct)
  • Modbus protocol with a UDP interface
  • Modbus protocol with both TCP and IP interfaces
  • Modbus protocol with an IP interface

    • What is the purpose of Modbus protocol?

    <p>Establish client and server communication between intelligent devices</p> Signup and view all the answers

    Which company originally published the Modbus protocol?

    <p>Modicon</p> Signup and view all the answers

    What does RTU stand for in Modbus RTU protocol?

    <p>Remote Terminal Unit</p> Signup and view all the answers

    In which industry is Modbus often used to connect a system supervisory computer with an RTU?

    <p>Electric power industry</p> Signup and view all the answers

    What does Modbus TCP/IP define?

    <p>Rules for organizing and interpreting the data</p> Signup and view all the answers

    What is a common means of connecting industrial electronic devices?

    <p>Modbus</p> Signup and view all the answers

    What is the application protocol that defines the rules for organizing and interpreting the data in Modbus?

    <p>Modbus messaging structure</p> Signup and view all the answers

    What does Modbus support communication to and from?

    <p>Multiple devices connected to the same cable or Ethernet network</p> Signup and view all the answers

    What is a typical use of Modbus in SCADA systems?

    <p>Connecting a system supervisory computer with an RTU</p> Signup and view all the answers

    What is the reserved system port for accessing Modbus on the TCP/IP stack?

    <p>Port 502</p> Signup and view all the answers

    What is the name for a single physical output in Modbus?

    <p>Coil</p> Signup and view all the answers

    What is the Modbus function code used for reading an input/output port?

    <p>Not specified in the text</p> Signup and view all the answers

    Which type of Modbus memory object consists of digital inputs?

    <p>Input coils</p> Signup and view all the answers

    What is the address type for analog outputs in Modbus?

    <p>4xxxxx</p> Signup and view all the answers

    How many extra bytes does the M-BAP header add at the beginning of a Modbus TCP transmission?

    <p>Seven</p> Signup and view all the answers

    What is the purpose of the Modbus Application Protocol (M-BAP) header?

    <p>For Modbus application with additional bytes</p> Signup and view all the answers

    What type of protocol is Modbus?

    <p>Request and reply protocol</p> Signup and view all the answers

    What does an ADU consist of in Modbus?

    <p>A PDU</p> Signup and view all the answers

    What is the function of Modbus commands?

    <p>Instruct a Modbus device to change register values</p> Signup and view all the answers

    What is the Modbus address range for devices that can respond to commands?

    <p>1 to 247</p> Signup and view all the answers

    What is the Modbus address type for Boolean data type input coils?

    <p>1xxxxx</p> Signup and view all the answers

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