CEMP-E
TI 811-12
18 August 1998
Data Transmission Circuit
to Central/Island Station
Modem or
Line Driver
Smart
Unitary Controller
Field
Communication Bus
Panel
I/O Interface
Unitary
Unitary
To Utility
Controller
Controller
Systems
I/O Interface
I/O Interface
To Utility
To Utility
Systems
Systems
Figure 4-6. Smart Field Panel and Unitary Controllers (System with Multiple Data Transmission
Channels).
LAN Connected to
Central/Island Station
Network
Interface
Smart
Unitary Controller
Field
Communication Bus
Panel
I/O Interface
Unitary
Unitary
To Utility
Controller
Controller
Systems
I/O Interface
I/O Interface
To Utility
To Utility
Systems
Systems
Figure 4-7. Smart Field Panel and Unitary Controllers (System with LAN-based Smart Field Panels).
6. I/O FUNCTIONS. Electronic circuits enable the UMCS to interface with the utility system
instrumentation and controls. Instrumentation signals from utility systems to field equipment panels are
either digital or analog signals. Control signals to the utility systems from the field equipment panels are
converted into digital or analog commands. Analog data to and from utility systems must be conditioned
to ensure signal level and type compatibility between the I/O functions and utility systems instrumentation
4-6
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