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3.
Final
stored
The use of
Storage
in
processing
While the
constant,
the areas
Section
1
memory,
progranfs
entered in Program Tables
1
and
2, and
$ubroutine Table 3. (Sections OV3,
1.1)
state
Module
or
for retrieval via
links. Values are
stored
in
Final
only
by
the Output
Output
19,296
power
Instructions and only when
the
is
set in the users
program. The
allocated'
to Final Storage at
is reduced if Input or Intermediate
is increased.
Systeni Memory -
used for overhead tasks
such
as]
compiling programs, transferring
data,
etb. The
user
cannot access this
ge
- Final, processed values are
for transfer
to printer, tape, solid
Input, Intermediate,
and Final
measurement and data
is
shown
in Figure OV2:1.
size
of
these three areas remains
may
be reallocated between
accommodate
different
t and
processing needs (*A Mode,
The size of system and program
fixed.
21X MICROLOGGER OVER\NEW
used to
develop high level algorithms to
process measurements prior
to Output
Processing
(Section
1
0).
OUTPUT PROCESSING INSTRUCTIONS
(69-82,
Section
1
1)
are
the only instructions
which store
data in Final Storage
(destination). Input Storage (source) values
are processed over time to obtain averages,
maxima, minima,
etc.
There are two types
of processing done by Output Instructions:
Intermediate
and Final.
Intermediate processing normally takes
place each time
the instruction
is
executed.
For example, when the
Average Instruction
is
executed,
it
adds the values from
the
input locations being averaged
to running
totals
in lntermediate Storage. lt also keeps
track
of
the number of samples.
Final processing occurs only when the
Output Flag is
high.
The
Output Processing
Instructions check the
Output
Flag.
lf
the
flag is high,
finalvalues
are
calculaled and
output. With
the
Average, accumulated
totals are
divided by the number of samples
and
the resulting averages sent to Final
Storage. lntermediate
locations are zeroed
and
the process stafts
over.
The Output
Flag, Flag 0, is set high by
a Program
Control Instruction which must precede the
Output Processing
Instructions
in
the user
entered program.
PROGRAM CONTROL INSTRUCTIONS
(85-98,
Section 12)
are
used
for logic
decisions and conditional
statements. They
can set flags, compare values or times,
execute loops, call subroutines, conditionally
execute portions
of
the program, etc.
OV2.3
PROGRAM
TABLES AND THE
EXECUTION
AND OUTPUT INTERVALS
Programs are
entered
in
Tables
1
and
2.
Subroutines, called from
Tables
1
and
2, are
entered in Subroutine Table
3.
The size of each
table
is
flexible, limited only by the total amount
of program
memory.
lf
Table
1 is
the only table
programmed,
the entire program memory
is
available for
Table
1.
Table
1
and
Table 2 have independent
execution intervals. entered in units of seconds
ov2.2 21Xl
Figure
1
illustrates
the use
of
the
three
act
on
data. The
used to control
different
i
ion types which
fouilh
type,
Control,
is
output
ti
and
vary program execution.
are identified by numbers.
1.
rNPUT/OUTPUT
TNSTRUCTTONS (1-
26,101-104, Section 9) controlthe terminal
strip inputs and
outputs (the sensor
is
the
source, Figure OV1-2), storing the results
in
Input
Sprage (destination).
Multiplier and
offset pBrameters allow conversion
of linear
signals into
engineering units. The Control
Ports and Continuous Analog Outputs are
also addressed
with l/O lnstructions.
2.
PROCqS$NG
TNSTRUCTTONS
(30-66,
Sectionr
1
0) perform numerical operations
on
valups located in Input Storage (source)
and
stofe the results back in Input Storage
(destin4tion). These instructions can
be
4.
ov-5
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