SIREC D Display Recorder 7ND4000

Programming
C. Alarm Deadband - An Alarm Deadband can
be set for each point. The alarm Deadband is also
called hysteresis and is an amount added or
subtracted (depending whether the alarm is low or
high) to the actual set point to determine the reset
point. It is primarily intended to reject noise about a
set point. For example, if a high alarm set point is at
50, and the deadband is set at 5, the alarm will
trigger when the input exceeds 50 but will not clear
(reset) until the input reaches 45 (Set point minus
hysteresis).
1. Programming Alarm Deadband - At the
"Alarms" prompt in the Point Setup Menu, press
ENTER. The display will show the Alarms Setup
Menu.
2. Use the UP (↑) or DOWN (↓) Arrow Keys to
scroll through the menu items in the Alarms Setup
Menu and highlight "alm deadband". Press
ENTER and the display reads "db�XX…XX�".
3. Use the numeric keypad to enter the desired
deadband in absolute engineering units. Press
ENTER and the display returns to the "Alm deadband"
option in the Alarms Setup Menu.
D. Alarm Delay - An Alarm Delay can be set for
each point. This delay prevents the alarms from
activating until the set time has elapsed from an
alarm active condition. If the alarm condition goes
away before the delay is up, the alarm will not
respond. The delay retriggers. If the alarm condition
goes away before the delay is up and then return,
the delay is reset and the full delay period will expire
before the alarm becomes active. This feature can
be used to overcome spurious or transient alarm
conditions.
1. Programming Alarm Delay - At the "Alarms"
prompt in the Point Setup Menu, press ENTER.
The display will show the Alarms Setup Menu.
Use the UP (↑) or DOWN (↓) Arrow Keys to scroll
through the menu items in the Alarms Setup Menu
and highlight "alm delay". Press ENTER and the
display reads "seconds�XX...XX�".
2. Use the numeric keypad to enter the desired
delay up to a maximum of 600 seconds (ten minutes).
Press ENTER and the display returns to the
"Alm delay" option in the Alarms Setup Menu.
4-44
4.7 RECORD SETUP
Data on/off
Alarm on/off
Record Mode
Points
Points (Trigger)
Record rate
Disk Full Alarm
Format Disk
Save CFG File
Load CFG File
Filename
Figure 4-15
Record Menu
This section deals with setting up
the recording of data to the disk,
either floppy disk or PCMCIA
memory card. The Programming
menu for Record Setup is shown
in Figure 4-15. You can choose
whether to record only data
(Data on/off) and which points to
record (Points), or to record only
Alarm/Event information (Alarm
on/off), or record both data and
alarm/event information. Points
(Trigger) enables you to set up
which alarm points will stop or
start recording. The Record Mode sets up whether
data is recorded to fill the disk and stop, or to cycle
around continuously, replacing the oldest data with
the newest, as well as setting the average or
instantaneous sample storage method.
The Disk Full Alarm option allows you to set the full
threshold to alarm the fact that the disk is getting
full, while the Filename option allows you to enter a
unique file name for each recording session. The
exact details of each menu option is given below.
NOTE
The menu options cannot be accessed while
the unit is recording. Use the “record on/off”
option in the function menu to stop the unit
recording prior to attempting to access this
menu!
Siemens AG C79000-G7374-C211-01
SIREC D Manual