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.1 Stand-alone panels ( SAP's ) shall be considered to be any
panel connected to a primary communication network.
In addition, SAP's shall control central plant
equipment ( i.e. air handling unit equipment, boiler plant equipment,
chiller plant equipment ).
.2 Terminal unit controllers ( TUC's ) shall be considered to
be any panel connected to a SAP through a
sub-communication network. In addition, TUC's shall
control HVAC terminal devices serving one single
thermostatic zone (i.e. VAV terminal unit, dual-duct
terminal unit, fan-coil terminal unit, water-loop heat pump unit).
.1 Provide filters to protect the system from power line surges and voltage transients.
.1 Provide automatic retention of RAM and real time clock from
any power failure of at least SEVENTY-TWO (72)
hours duration. This feature will be checked during
the commissioning phase.
.2 Provide for automatic restart of the system upon power return.
.1 Any component malfunction shall not damage any of the remaining components.
.2 Provide over voltage protection on inputs and outputs.
.1 SAP and TUC replacement shall be possible without any hardware modification.
.1 The system shall have the capability to be taken off line
in the event of failure or for maintenance and returned to
operation without the need for entering any portion
of the software program manually. To accomplish this, an
off-line disk storage device shall be utilized to
provide software backup and reload.
.2 On-site backup and verification of the entire system, with
full applications software, shall be less than TWO (2)
seconds per real point. This feature will be checked
during the commissioning phase.
.1 Each SAP on the main network proposed shall have enough
random access memory (RAM) for all of the
following:
.1 Trend Logs - One and a Half
(1.5) TL for each input and output point connected to the SAP with 100
samples
each.
.2 Totalizers - ONE (1) for each digital point connected to the SAP.
.3 Time Schedules - ONE (1) for every 3 output points connected to the SAP.
.4 Annual Schedules - ONE (1) for every 6 output points connected to the SAP.
.5 Controllers - TWO (2) for each analog output point connected to the SAP.
.6 Software Points - THREE (3) for each output point connected to the SAP.
.7 Operator Control Language
(OCL) - TWENTY (20) syntactically correct lines each with at least 4 operators,
for each
output point connected to the SAP .
.8 Descriptor - ONE (1) for
each user definable point, real or software, in the SAP. In addition, on multi-SAP
systems,
every descriptor in the system must be accessible from every operator interface device.
.9 In the event there are TUCs
networked to the SAP, which do not have their own memory meeting items .1
through .7, the
SAP must have full memory for all TUC points as well as points connected directly.
.10 Provide with shop drawing submittal,
calculations which confirm the foregoing RAM requirements are met for
each SAP.
.1 Effective SAP Processing Speed - Maximum permissible
execution time is TWO (2) seconds. Execution time is
defined as the time it takes the SAP CPU to execute
all application software in the SAP, with no system timing
errors, from some point in the software back to the
same point, assuming full memory usage, as defined in Clause
3.7 above, while simultaneously responding to
operator or terminal display requests and carrying out normal
inter-SAP communications averaged over a ONE
(1)-minute period. This will be done during the commissionary
phase by setting up a counter in each SAP and
monitoring their counting rate.
.1 The minimum time to change from one dynamic screen to
another is 7 seconds. This test will be carried out from a
remote site with the Corporation's standard modem and
will be the average of 10 typical displays for the project.
Test will be carried out with the specified system
configuration, excluding multi-user and alarming functions.
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