18 August 1998
SOFTWARE DESCRIPTIONS AND REQUIREMENTS
1. GENERAL. The operation of UMCS is controlled by software at the central station, island station,
and field equipment panels. UMCS are distributed processing networks that provide increased
operational reliability through the use of distributed software and computing power by executing
application programs while processing and storing information at field equipment panels. The distributed
processing approach also provides increased operator convenience through the graphical interface
available at each workstation.
CENTRAL STATION AND ISLAND STATION.
a. Four types of software may be implemented in the central station and island stations:
(1) Operating system software controls operations of the CPU and performs functions such as
control of its peripheral devices, file management, service interrupts, diagnostics, and software
(2) Command and graphical user interface software enables the operator to monitor, control,
and interact with the system via any workstation using a graphical interface or simple English language
commands. Command software is designed to generate reports, display alarms, display system
graphics, and exchange data between field equipment and island stations and between island stations
and central station.
(3) Applications software consists of energy conservation and other support programs affecting
(4) LAN software includes a network operating system which controls communication between
network devices, including the central station or island station computer, workstations and shared
peripheral devices such as network printers.
b. The operating system software, the command software and the graphical user interface
software, and the LAN software are always running at the central station regardless of the type of
applications software implemented. Under normal conditions, the command software updates the central
station database whenever a change in data is entered into the system.
c. The type of applications software programs resident in the central station and island stations
varies according to the type of equipment and utility systems monitored and controlled by the UMCS. A
copy of all applications software installed in the field equipment panels will also be maintained at the
central station and updated to the island station and field equipment panels whenever changes are made
to the programs. Software such as demand limiting applications involving equipment at multiple
geographical locations will be executed at the central station. Other demand limiting applications
involving equipment monitored and controlled by multiple field equipment panels will be executed at the
FIELD EQUIPMENT PANEL.
a. Two types of software are implemented in the field equipment panel.
(1) Operating system software controls and schedules the operation of the microprocessor,