Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manuale Utente Pagina 101

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Chapter 6
 !!!!
6-20
Analogy to Client/Server Application
A simple analogy to the client/server application is the
time-and-temperature service that is provided by the local telephone
company. To acquire the time and temperature, you:
look up time and temperature in the telephone directory
dial the number
receive an announcement of the time and local temperature
hang up the telephone
The following flow chart shows a client/server analogy to the
time-and-temperature operation.
"   #
 
 "  "
 
 " ! %! 
 
  "  %! 
 
 ! ! ! "!
 
'"
 
 
Client
"   #
 
"!  "  
 
"& "! ! " !
 ! ! ! ! ! "!
 $ "
 
 ! " & "
 $ 
 
" !
 
'"
 
 
Server
!  %! 
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