JUMO 706585 LOGOSCREEN fd Operating Manual - Manual (Page 40)

2 Instrument Description
40
2.9 Data Storage
Operating
principle
Data recording Measurements are acquired continuously in a 125msec sampling cycle. Based
on these measurements, reports are compiled and limits checked. The
measurements are transferred to the main memory of the instrument,
according to the programmable storage cycle and stored value (maximum,
minimum, average, Min&Max, momentary value or economy mode).
The paperless recorder saves the data according to groups, and the input can
be assigned to several groups (up to 9).
Main memory
(SRAM) The data stored in the SRAM are regularly copied to the internal memory in
20 kbyte blocks.
Internal
memory When a block in main memory has been filled, it is copied to the internal
memory. Internal memory has a capacity of max 256 Mbytes. Every write
action is monitored, so that any errors in saving data can be immediately
identified. The instrument monitors the capacity of the internal memory and
activates one of the “memory alarm” signals when the capacity has fallen
below the configurable residual capacity level. These signals can be used,
forinstance, to operate the alarm relay.
This is written to as a ring memory, i.e. when the memory is full, the oldest data
will automatically be overwritten by new data.
The data from the internal memory can be shown as a history presentation on
the recorder. The size of the history memory can be configured.
CompactFlash
memory card
(external) If an external CompactFlash memory card (Industrial Grade) is inserted into
the paperless recorder, memory blocks are automatically written to the CF
card.
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”).
For recorders with a stainless steel panel (extra code 444) the CompactFlash
memory card is not available as external memory. The measured data can be
saved through one of the interfaces or through a USB flash drive (on the rear
side).
A/D 2
A/D 1
CPU
(SRAM)
20
kB
20
kB 20
kB
20
kB
20
kB
Internal
memory
Analog inputs
External
CompactFlash
memory card