8. Communications
RS-232
C C
I i Oi
r Central
n ur
p c Processor t c
u u (CPU) pu
t i ui CR
t t t
s s
High High
Voltage Voltage
MEMORY
program data
AC Power
Supply or External
DC Power
Supply
13. Operator Workstations Operator Workstations
Users
Master Ethernet LAN
Station
Connectivity
Redundant SCADA Hosts Application Host Systems
Comm
Equipment Gateway(s) to
Corporate
Networks
SCADA SCADA Application Application
Server-A Server-B Server-A Server-B
Communication Communication System
Leased Line, Direct Connect,
Radio, Satellite, Radio, Etc.
RTUs & RTU or PLC RTU or PLC RTU or PLC
PLCs
Status, Controls and Measurements Status, Controls and Measurements Status, Controls and Measurements
Field Originating
Stataion or
End Point
or Terminal
Devices
Typical Pipeline
Receipt Delivery
Location Intermediate Pump/Compressor Station Location