Question: Describe how the IEC 60870-5-104 profile enables ASDUs to be sent over LAN and WAN networks using……

Describe how the IEC 60870-5-104 profile enables ASDUs to be sent over LAN and WAN networks using standard TCP/IP protocols. [5 Marks]

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IEC 60870-5-104 is an extension of IEC 101 protocol with change in Transport,Physical,Network and Link Layer to suite the complete network access.the standard uses an open TCP/IP interface to the network to have connectivity to the LAN and router with diffrent facility can be used to connect to the WAN(wide area network).

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in this ASDU(application service data unit) which is a block of data is sent from the controlling station(SCADA master) to an out station(such as clear SCADA) or device. contains 2 main sections the data unit identifier and data itself.each ASDU can transmit upto 127 objects.in the protocol model ASDU is exchanged over LAN as Telegrams,this frame type format of ASDU is used to exchange data over network.

ASDU type identifier
variable structure qualifier
cause of transmission(cot)
common address of ASDU
information object address
set of information elements
optional time tag(3 or 7 bytes)
…
…
information object n(last IOA)

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