b.
Outputs. Local processor outputs shall reflect the state of
commands issued by the central station. The outputs shall be a
form C contact and shall include normally open and normally closed
contacts. The local processor shall have at least 4 command
outputs.
2.5.2
Processor Power Supply
Local processor and sensors shall be powered from an uninterruptible power
source. The uninterruptible power source shall provide 6 hours of battery
back-up power in the event of primary power failure and shall automatically
fully recharge the batteries within 12 hours after primary power is
restored. There will be no equipment malfunctions or perturbations or loss
of data during the switch from primary to battery power and vice versa.
Batteries shall be sealed, non-outgassing type. The power supply shall be
equipped with an indicator for ac input power and an indicator for dc
output power. Loss of primary power shall be reported to the central
station as an alarm.
2.5.3
Auxiliary Equipment Power
A GFI service outlet shall be furnished inside the local processor's
enclosure.
2.6
FIELD PROCESSING SOFTWARE
All field processing software described in this specification shall be
furnished as part of the complete system.
2.6.1
Operating System
Each local processor shall contain an operating system that controls and
schedules that local processor's activities in real time. The local
processor shall maintain a point database in its memory that includes all
parameters, constraints, and the latest value or status of all points
connected to that local processor. The execution of local processor
application programs shall utilize the data in memory resident files. The
operating system shall include a real time clock function that maintains
the seconds, minutes, hours, date and month, including day of the week.
Each local processor real time clock shall be automatically synchronized
with the central station clock at least once per day to plus or minus 10
seconds. The time synchronization shall be accomplished without operator
intervention and without requiring system shutdown.
2.6.1.1
Startup
The local processor shall have startup software that causes automatic
commencement of operation without human intervention, including startup of
all connected functions. A local processor restart program based on
detection of power failure at the local processor shall be included in the
local processor software. The startup software shall initiate operation of
self-test diagnostic routines. Upon failure of the local processor, if the
database and application software are no longer resident, the local
processor shall not restart and systems shall remain in the failure mode
indicated until the necessary repairs are made. If the database and
application programs are resident, the local processor shall immediately
resume operation.
SECTION 13721A
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