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Setting Up, Understanding & Troubleshooting of Industrial Ethernet & Automation Networks


Objectives

• Describe the functions of the seven OSI layers

• Map the various layers of IEEE 802.11 and IEEE 802.15 as well as the various field buses on to the OSI model

• Describe current trends in the plant Industrial automation arena


Network types

• LANs (Local Area Networks)

• MANs (Metropolitan Area Networks)

• WANs (Wide Area Networks)

• WLANs (Wireless LANs)

• PANs (Personal Area Networks) / WSNs (Wireless Sensor Networks) / WMNs (Wireless Mesh Networks


The OSI model

OSI layering concept


The OSI model

• Relationship between layers, entities, functions and SAPs


The OSI model

• Service primitive


The OSI model

• Peer layer interaction in OSI model


The OSI model

• OSI message passing


OSI layer services

• Application layer

• Presentation layer

• Session layer

• Transport layer

• Network layer

• Data Link layer

• Physical layer


The Client/Server paradigm

A p p l i c a t i o n

P r e s e n t a t i o n

S e s s i o n

T r a n s p o r t

N e t w o r k

D a t a L i n k

P h y s i c a l

A p p l i c a t i o n

P r e s e n t a t i o n

S e s s i o n

T r a n s p o r t

N e t w o r k

D a t a L i n k

P h y s i c a l

N e t w o r k

D a t a L i n k

P h y s i c a l

R o u t e r

C l i e n t S e r v e r

C o m m u n i c a t i o n s M e d i u m

P e e r t o P e e r

R e l a t i o n s h i p s

•Client/Server communication


Where the different technologies fit in ?

• Networking technologies such as IEEE 802.3 (Ethernet), IEEE 802.11 (Wireless LANs, a.k.a. Wi-Fi) and IEEE 802.15 (Wireless PANs)

• TCP/IP protocol stack

• WAN, routing and end-to-end control

• Automation networks

• Field buses


Current trends

• Ethernet

• ‘Retrofit’ of Ethernet to existing field buses

• Additional Real Time capabilities to Ethernet

• Use of TCP/IP for the middle layers of the stack

• Use of OPC

• Use of wireless in Industrial environments


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