Practical troubleshooting & problem solving of industrial data communications
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Transcript of Practical troubleshooting & problem solving of industrial data communications
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Practical Troubleshooting & Problem Solving of Industrial Data Communications
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Topics• Introduction• Modern Instrumentation and Control• OSI Model• Standards • Protocols
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Introduction• Transfer of Information From One Point to
Another
• Transmitter/Receiver/Link
• Serial Links vs Parallel Links
• Digital Data vs Analog
• Mutual Agreement
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SCADA
• Supervisory Control and Data Acquisition System
• RTU’s to Master Station
• Radio Links /Landlines
• Also A Term Used for SCADA Software packages such as Citect,Wonder Ware etc
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OSI Model• Developed by the ISO
• Universal Framework for Building A Communications Systems
• 7 Layer Model
• 3 Layer Model Very Common for Industry
• Missing the 8th Layer
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Representation of the OSI Model
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Basic Structure of an Information Frame Defined
SyncByte
DestinationAddress
SourceAddress
Data to beTransmitted
Error DetectionByte
SYNCHRONIZING BYTE Is Used To Synchronize The Receiver.
DESTINATION ADDRESS Is Where The Packet Is Going.
SOURCE ADDRESS Is Where The Packet Has Coming From.
DATA Is The Information Contained In The Packet.
ERROR BYTE Is The Result Of The Error Correction Calculation.
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Two Wire Multidrop RS-485
R
R
G
G
RX RX
TX TX
A A
B B
A A
B B
GWG GWG
Rt Rt
R
G
RX
TX
A
B
A
B
GWG
R
G
RX
TX
A
B
A
B
GWG
- Generator
- Receiver
- Circuit ground orcircuit common
- Protective ground orframe ground
- Green wire ground orpower system ground
G
R
GWG
Note: The RS-485 standard documentationleaves out the invertes for the receiver
1200M (4000 FT)
TERMINATION RESISTORS AT BOTH ENDS ONLY
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Fiber Optic Cable
CoreLight Rays
Light Ray
Cladding
Multimode
Monomode
Sheath
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HART ProtocolFSK Communications On Top Of 4 -
20 mA
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ProfibusTypical Architecture of System
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Foundation Fieldbus
• Newest Fieldbus
• H1 standard - 31.25kbit/s
• HSE - 100Mbit/s
• Three layers plus excellent User Layer
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Ethernet 10BaseT
MAC = Media Access Control
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TCP/IP
• Internet Protocol (IP)
• Transmission Control Protocol (TCP)
• Application Layer
• Three Layer Model
• Derived from Internet
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Wireless Communications
RadioTransmitter/Receiver
RadioTransmitter/Receiver
Modem Modem
Antenna AntennaRS-232
RS-232
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