Regarding industrial communication protocols, consider the following:1.Modbus is a widely used serial communication protocol in industrial automation.2.Profinet is an Ethernet-based protocol used for high-speed data exchange.3.Standard RS-232 cables can be used for communication over several kilometers without repeaters.Which of the statements given above is/are correct?
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Modbus is a widely used industrial protocol with serial variants such as Modbus RTU and Ethernet variant Modbus TCP. RS-232 is intended for relatively short point-to-point links and is not a several-kilometre physical layer without converters/repeaters. Key relation: RS-485 is preferred for longer multidrop serial links compared with RS-232.
Exam focus: Match protocol and physical layer; they are not the same concept. Common trap: RS-232 distance is limited.
Formula / Key Relation
RS-485 is preferred for longer multidrop serial links compared with RS-232.
Detailed Explanation
Correct Answer: B - 1 and 2 only Quick Concept Explanation Modbus is a widely used industrial protocol with serial variants such as Modbus RTU and Ethernet variant Modbus TCP. RS-232 is intended for relatively short point-to-point links and is not a several-kilometre physical layer without converters/repeaters. Key relation: RS-485 is preferred for longer multidrop serial links compared with RS-232.Exam focus: Match protocol and physical layer; they are not the same concept. Common trap: RS-232 distance is limited. Statement-wise Verification Statement 1 - Correct.Modbus is a widely used serial communication protocol in industrial automation.Modbus is a widely used industrial protocol…
Correct Answer: B - 1 and 2 only
Quick Concept Explanation
Modbus is a widely used industrial protocol with serial variants such as Modbus RTU and Ethernet variant Modbus TCP. RS-232 is intended for relatively short point-to-point links and is not a several-kilometre physical layer without converters/repeaters. Key relation: RS-485 is preferred for longer multidrop serial links compared with RS-232.
Exam focus: Match protocol and physical layer; they are not the same concept. Common trap: RS-232 distance is limited.
Statement-wise Verification
Statement 1 - Correct. Modbus is a widely used serial communication protocol in industrial automation. Modbus is a widely used industrial protocol with serial variants such as Modbus RTU and Ethernet variant Modbus TCP.
Statement 2 - Correct. Profinet is an Ethernet-based protocol used for high-speed data exchange. Modbus is a widely used industrial protocol with serial variants such as Modbus RTU and Ethernet variant Modbus TCP.
Statement 3 - Incorrect. Standard RS-232 cables can be used for communication over several kilometers without repeaters. RS-232 is intended for short point-to-point links and is not a several-kilometre medium without conversion/repeaters
Core Concept
Modbus is a widely used industrial protocol with serial variants such as Modbus RTU and Ethernet variant Modbus TCP. PROFINET is industrial Ethernet. RS-232 is intended for relatively short point-to-point links and is not a several-kilometre physical layer without converters/repeaters.
Formula / Key Relationship
RS-485 is preferred for longer multidrop serial links compared with RS-232.
Why the Other Options Are Wrong
Option A is incorrect because it includes incorrect statement(s) 3. Option C is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 2. Option D is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 1.
Exam Shortcut / Approach
Match protocol and physical layer; they are not the same concept.
Common Mistake
RS-232 distance is limited.
Quick Revision
Modbus Profinet and RS-232 is linked with Industrial Protocols, Communication and Industrial Automation. Match protocol and physical layer; they are not the same concept.
Quick Trick
Match protocol and physical layer; they are not the same concept.
Why Other Options Are Wrong
Option A is incorrect because it includes incorrect statement(s) 3. Option C is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 2. Option D is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 1.
Common Mistake
RS-232 distance is limited.
Exam Tip
Match protocol and physical layer; they are not the same concept.
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