JUMO 706510 LOGOSCREEN 500 cf Data Sheet - Manual (Page 6)

JUMO GmbH & Co. KG • 36035 Fulda, Germany Data Sheet 70.6510 Page 6/10
2009-12-15/00467412
A/D 2
A/D 1
CPU
4kB
4kB
4kB 4kB
4kB
350,000
measurements
Main memory
Analog inputs
Operating principle
External
CompactFlash
memory card
Data processing
The measurements from the analog inputs are
acquired continuously in a 250msec sampling
cycle. These measurements also serve as the
basis for limit monitoring. The measurements
are transferred to the main memory of the
instrument, according to the configurable
storage cycle and stored value (average,
momentary value, maximum, minimum, or
peak value).
Main memory (FLASH memory)
The data stored in the main memory are
regularly copied to the Compact Flash card in
4 kbyte blocks. The main memory is written to
as a ring memory, i.e. when it is full, the oldest
data will automatically be overwritten by new
data. The memory capacity is sufficient for
approx. 350,000 measurements.
The instrument monitors the capacity of the
main memory and activates the “Memory
alarm (internal)” signal if the level falls below a
configurable residual capacity.
CompactFlash card
For saving the data, CompactFlash cards
(industrial grade) can be used with the
following storage capacities:
≤
2GB.
The instrument monitors the capacity of the
CompactFlash card, and activates the
“Memory alarm (CF card)” signal if the level
falls below a configurable residual capacity.
This signals can be used, for instance, to
operate a relay (warning signal “Swap CF
card”).
Data security
The data are stored in coded form in a
proprietary format.
If the CompactFlash card is removed from the
instrument, no data will be lost immediately,
as these data are still stored in the FLASH
memory.
A loss of data will only occur if, after the
CompactFlash card has been removed, the
FLASH memory is completely rewritten as
well.
Response to disconnection of the
instrument from the electrical supply
- Configuration and measurement data will
be retained, even after the paperless
recorder has been disconnected from the
electrical supply.
- When the lithium battery, supplied ex-
factory, is exhausted (
≥
10years) or the
storage capacitor (available on request) is
discharged (typically 2 weeks), all
measurements that have not yet been
saved on a CompactFlash card, as well as
the time, will be lost.
Recording duration
Depending on the configuration of the
instrument, the duration of the recording can
vary over a considerable range (from a few
days up to several months).
Limit monitoring/
operating mode changeover
An over/underlimit condition will trigger an
alarm. The alarm can be output through a
relay or used as a control signal for changing
over the operating mode from normal/timed
operation to event operation. The storage
cycle and stored value can be configured
separately for all three operating modes.
With the help of the alarm delay function, brief
occurrences of over/underlimit conditions can
be filtered out, with the result that no alarm is
generated.
Normal operation
If the instrument is not in event operation and
not in timed operation, then normal operation
is active by default.
Timed operation
Timed operation is active on a daily basis,
within a programmable time period.
Event operation
Event operation is activated/terminated by a
control signal (binary input, combination
alarm). As long as this control signal is active,
the instrument is in event operation.
The operating modes have different priorities
.
Operating mode Priority
Event operation 1 (higher)
Timed operation 2
Normal operation 3 (lower)