Industrial Protocols QA

Question 1

Which protocol is a set of open standards developed and promoted interoperability between disparate field devices, automation/control, business system ?

Answer 1

OPC

Question 2

What are the different versions of Profibus ?

Answer 2

Profibus PA (serial)
Profibus DP (serial)
Profibus FMS
Profisafe (safety)
Profinet (TCP-Ethernet)

Question 3

Which protocol is in De facto standard ?

Answer 3

Modbus

Question 4

Different variants of modbus ?

Answer 4

Modbus Serial
Modbus Plus
Modbus TCP

Question 5

Modbus Serial uses which layers ?

Answer 5

1. Physical Layer (RS-232/RS485).
2. DLL (Master/Slave).
3. Application Layer.

Question 6

Modus Plus uses which layers ?

Answer 6

1. Physical
2. DLL (HDLC)
3. Application Layer

Question 7

Modbus TCP uses which layer ?

Answer 7

1. Physical
2. DLL (CSMS/CD)
3. Network
4. Transport (modbus TCP messaging)
5. Application Layer

Question 8

Modbus uses which port number ?

Answer 8

TCP 502

Question 9

Profibus uses which layer ?

Answer 9

1. Physical
2. DLL
3. Network
4. Transport
5. Application

Question 10

What are the Common Industrial Protocol ?

Answer 10

DeviceNet
ControlNet
EtherNet/IP (IP=Industrial protocol)

Question 11

EtherNet/IP uses which IEC standard

Answer 11

IEC 61158

Question 12

What are the 2 communication mechanism in EtherNet/IP ?

Answer 12

1. Implicit messaging (Port 2222 used for Provider/Subscriber, typically for UDP multicast and Unicast for IO transfer)
2. Explicit messaging
   (Port 44818 used for Client server HMI to PLC, TCP unicast for administration and data transfer)

Question 13

Different OPC Specification

Answer 13

OPC DA
OPC AE
OPC HDA
OPC Batch
OPC Data eXchange
OPC Security
OPC XML-DA
OPC UA

Question 14

DCOM uses which port range ?

Answer 14

1024 - 65535

Question 15

What is the encryption level of OPC UA ?

Answer 15

128 or 256 bit encryption levels