18 August 1998
CENTRAL STATION AND ISLAND STATION HARDWARE
a. The central station and island stations are arrangements of personal computers (PCs),
peripherals, and PC based operator workstations communicating together on a local area network (LAN).
The central station and island station provide human operator interface, centralized utility optimization
routines, and archival data storage for the UMCS. For UMCS extended to multiple geographical and
functional areas, each island station provides human operator interface with field equipment panels within
a geographical and functional area, while the central station provides supervisory interface with multiple
island stations. For UMCS installed at a single installation, the central station provides human operator
interface, centralized optimization and archival data storage, and there are no island stations. Depending
on the utility monitoring and control needs of the installation, a UMCS may include only a central station
or may include a central station and a number of island stations.
b. A UMCS for a single installation requires a central station interfaced with field equipment
through data transmission systems. This configuration is illustrated in Figure 3-1.
Figure 3-1. Single-Site UMCS with Central Station.
c. A UMCS for multiple installations requires a central station interfaced through data transmission
systems to island stations at each remote geographical area. Field equipment at each installation is
interfaced through data transmission systems to that installation's island station. Field equipment at the
installation containing the central station will be interfaced to the central station. This configuration is
illustrated in Figure 3-2.