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.1 Provide means for
addition, deletion, definition and modification of points and point types through the
operator
interface.
.2 Provide links in the
database such that if a point name is changed in database, all database occurrences of
that point
will
automatically be changed.
.3 Provide direct keyboard
override of all physical and virtual points with an indication on the display of any point
that
is
operating under a keyboard override.
.4 The database for each
physical or virtual point must only require definition once, regardless of the number of
locations
where it is used.
.1 Operator defined digital and analogue alarms including operator defined limits and differentials from set points.
.2 Auto lockout of alarms when alarmed system is commanded off.
.3 Auto display of operator defined alarm messages.
.4 Operator defined routing of alarms.
.5 Log of points in alarm.
.1 User defined start/stop time or continuous trending.
.2 Sampling period user-adjustable from 5 seconds to 24 hours as a minimum.
.3 Change of value or change of state initiated.
.4 Display and print a minimum of 4 points simultaneously across the page.
.5 Ability to automatically dump trend logs to disk in ASCII format.
.1 Capability for display of a minimum of 4 points simultaneously, both analog and digital on the same graph.
.2 Capability for auto-scaling and ability to manually control horizontal and vertical scales.
.1 Provide the capability to accumulate units of all analog and digital points.
.1 Provide scheduling feature that allows for creation of start/stop schedules and their use in programs as follows:
.1
Weekly - 20 minimum per SAP
-
time of day, day
-
weekend, alternate day
-
direct override by Annual Schedules
-
8 daily stops/starts per day
.1 Analog Points
.1
System shall have the capability to accommodate user defined scale
ranges which can be attached to any input
or
output.
.2
Provide conversion tables or other mapping functions for analog input
and analog output points that define how
the
input or output hardware values relate to the engineering units used.
.3 This function must accommodate non-linear relationships.
.4 If a conversion table type function is used, it must have a minimum of 10 individually definable segments.
.5 Provide capability to assign any user defined unit to the analog point (i.e. percent, Deg C, Deg F, etc.).
.1 Provide the capability to define in database whether a digital input point is normally open or normally closed.
.2 Provide the capability to assign any pair of
engineering units to the relay open and relay closed positions of
digital output points. (i.e.
start/stop, on/off, open/closed).
.1 Provide controllers,
resident in each SAP and/or TUC, including a three-term, proportional, integral,
derivative,
(PID)
control algorithm.
.2 Provide, in each controller, the following set up and tuning capabilities:
.1 Direct or reverse acting.
.2 Output value to control, 0 to 100%.
.3 Set point.
.4 Proportional Gain.
.5 Integral gain.
.6 Derivative gain.
.7 Sampling time - variable from 1 to 60 seconds.
.8 Control loop bias.
.3 Provision shall exist for the
modification of the above by OCL programs and/or the operator while on-line through a
terminal.
.1 The stand alone panels
(SAPs) and soft terminal unit controllers (TUCs) shall have the capability for the
operator to
develop
and run custom application programs. For this, the system shall have a proven OCL which
shall be capable
of
reading the value and/or status of all system points and initiating both digital and
analog control actions from any
user
defined combination of calculations and logical expressions which shall at a minimum
include:
- Addition, subtraction, multiplication and division;
- Square roots, summations, absolute differences;
- Logical ``not'', ``and'', ``or'', ``nor'', ``and'', ``less than'', ``greater than'', and ``equal to'' or their logical equivalents;
- Time delays in seconds, minutes or hours;
- Ability to embed comments in system generated documentation;
- Ability to use time-of-day and day-of-year in algebraic calculations; and
- Ability to use weekly and annual schedules.
.2 The supplied system's
OCL shall support the concept of output oriented code, or in other words, a program shall
be
generated
for each controlling output or logical group of outputs. Required programs for each system
are listed in the
generic
start up logic, although manipulation will be required to achieve the intent in each
vendor's system.
.1 Provide a full screen
editor to enable editing of the OCL programs source code down to character by character
changes.
.2 Provide the capability
in the editor of accepting programs from ASCII files that have been created on other
MS-DOS
compatible computers and word processors.
.3 If a point is removed
from the database, show an error signal for undefined character on the appropriate line
whenever
a program using that point is viewed, edited or printed.
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