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4.7.6 Record rate.
at which data is stored to disk independently to the
rate at which it is displayed on the chart. The rate
can be set for all channels at once or it can be set
for each channel individually. The rate can be set
from a minimum rate of 4 times per second to a
maximum of once every 600 seconds or once every
ten minutes. The rate you choose is dependent on
how dynamic the process that you are measuring is.
If you are recording temperature which varies
slowly, you can maximize the amount of data that is
stored on the disk by keeping the record rate slow. If
you are measuring variables that change rapidly,
you may need to set the record rate at once per
second. Thus if you have one channel that is
recording a rapidly changing input and one that is
recording a n input that changes slowly, you can
optimize the record rate for each.
There are two record rates for each channel or
point, a low rate and a high rate. The default rate is
set in the FUNCtion menu - Record Speed. The
record rate can be changed by an external event if
the digital I/O option is fitted. Refer to Paragraph
4.9.2. External speed change is enabled in the
Autorate option.
1. Selecting Record Rate - To set record rates
use the UP (↑) or DOWN (↓) Arrow Keys to high-
light "Record Rate" on the menu and press
ENTER. There are three options:
•
Autorate
•
Individual Rate
•
All rates
A. AUTORATE -
Autorate enables the record
rate to be changed on an Alarm event.
1. To enable auto rate change, use the UP (↑) or
DOWN (↓) Arrow Keys to highlight "Autorate" and
press ENTER. You will be presented with a dis-
play that shows "autorate=NO" or "autorate=YES".
2. Press the YES or NO keys to enable or disable
the autorate change on alarm option then press
ENTER to return to the record rate menu
Siemens AG C79000-G7374-C211-01
SIREC D Manual
You can select the rate
B. INDIVIDUAL RATES -
record rates, perform the following steps:
1. Use the UP (↑) or DOWN (↓) Arrow Keys to
highlight "Individual Rate" and press ENTER. You
will be presented with a point selection keypad
that enables the selection of the specific point to
be programmed.
2. Enter the point number and press ENTER. This
brings up the record rate entry keypad and a dis-
play that shows "secs(lo)
the current sampling rate in seconds.
3. Use the numeric keypad to enter the record
rate from 0 to a maximum of 600 seconds, then
press ENTER to activate. The display will show
Î
Í
"secs(hi)
XXX
" where XXX is the current rec-
ord rate in seconds.
4. Use the numeric keypad to enter the record
rate from 0 to a maximum of 600 seconds, then
press ENTER to activate and return to the Record
Speed menu. Repeat the above procedure for
each point to be programmed. Press EXIT at any
time to return without altering the setting and to
return to the Record Setup menu.
C. ALL RATES -
To set the record rates for all
channels at once, perform the following:
1. Use the UP (↑) or DOWN (↓) Arrow Keys to
highlight "All Rates" and press ENTER. You will
be
presented
with
Î
Í
"secs(lo)
XXX
" where XXX is the current rec-
ord rate in seconds.
2. Use the numeric keypad to enter the record
rate from 0 to a maximum of 600 seconds, then
press ENTER to activate. The display will show
Î
Í
"secs(hi)
XXX
" where XXX is the current rec-
ord rate in seconds.
3. Use the numeric keypad to enter the record
rate from 0 to a maximum of 600 seconds, then
press ENTER to activate and return to the Record
Rate Programming menu. Press EXIT at any time
to return without altering the setting and to return
to the Record Setup menu.
Programming
To set the individual
Î
Í
XXX
" where XXX is
a
display
that
shows
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