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SCEP6020 MG6020 /1302 Automation
Review questions Industrial networks
1.
2.
3.
4.
Briefly explain all OSI layers
Referring to the OSI model explain the function of routers
Explain the most important OSI layers for automation engineers
Briefly compare bus and star configuration in term of collision domain and
accessibility to network nodes.
5. Describe how the Modbus and Ethernet protocols relate to the OSI Reference
Model. Why does the DeviceNet stack use so few layers?
6. Most IT LANs use transformer isolation between the LAN and the node
electronics. DeviceNet uses opto-isolation. Explain why this so.
7. Compare Modbus, Ethernet and devicenet in term of number of nodes, media
access and length of the transmission system
8. Briefly compare hierarchy and random access networks in term of the band
usage and reliability of transmission
9. Ethernet has not been a popular network for industrial use because of its
probabilistic nature. Describe why there is now a strong drive for its use in
industry.
10. Explain the basic components of a Modbus message
11. Describe how can transmit Modbus messages using the network infrastructure
that designed for Ethernet communication
12. Compare Modbus RTU and Modbus ASCII in term of the network infrastructure
and the transmission frame
13. Briefly explain the reason the technical reason that Modbus RTU doesn’t support
more than 248 nodes
14. Briefly describe two methods of media access in a sharing environment
15. Explain the main shortcomings of Ethernet communication in automation
engineering
16. Name two versions of the provirus standard and explain briefly explain the
application of each protocol
17. Briefly describe the differences between industrial Ethernet and the
convectional Ethernet
18. Briefly explain the reason to use
19. Name two protocols that works with bus configuration
20. Name a network that uses the same media for both data exchanging and
powering the node
21. Describe the devicenet frame. Why unlike Ethernet both destination and source
address are not allocated in the frame
22. Devicenet uses two wires to reduce the environment noise. Briefly explain the
process of noise cancellation
23. Name three component of the fieldbus networks
24. Name and briefly describe profibus technologies. Which one certified by
foundation fieldbus.
Automation review questions R1
Alireza Gheitasi
Waikato institute of Technology
25. Compare advantages and disadvantages of fieldbus versus the traditional 420mA data transmission
26. Name three function codes of the Modbus protocol
27. Referring to figure 1, answer the following questions:
201.10.1.3
201.10.10.58
192.168.1.110
192.168.1.200
B
PLC2
201.10.10.31
C
A
D
201.10.10.69
You
PLC1
192.168.1.8
192.168.1.11
192.168.1.111
192.168.1.10
192.168.1.9
Figure 1 network structure
a) Write down a command that find your ip address
b) Write down a command to check the connection of PLC1 in the network
c) write down a sample answer for the following command:
a. tracert 201.10.10.69
b. tracert 192.168.1.110
d) list all public and private IP addresses
e) name the most appropriate network device for the following components:
a. A:
b. B:
c. C:
Automation review questions R1
Alireza Gheitasi
Waikato institute of Technology