meM-LOG-SE
© BMC Messsysteme GmbH
Page 3
2 Functions of meM-LOG-SE
Various operation modes can be selected for the
meM-LOG-SE
concerning the scan frequency, the operation mode
and the storage mode. These are explained in the following table:
Funktion / Betriebsart
Beschreibung
Normal Mode
-
sampling in steps of seconds in the range of [1s, .. , 65535s (=18h 12min 15s)]
-
max. scan frequency: 1Hz per channel
-
device switches into
Sleep Mode
(see below) between sampling data
Fast Mode
-
fine adjustment of sampling interval in steps of 1/100sec. in the range of
[0.01s, .. , 655.35s (=10min 55s 350ms)]
-
max. scan frequency: 100Hz per channel (operating time of accumulator accordingly reduced)
-
device does not switch into
Sleep Mode
(see below)
Continuous Mode
-
continuous storage of measuring data, next scan cannot be started before either measuring values
have been transmitted, scan configuration has been changed or memory has been deleted
-
scan starting time is stored in UTC format (number of seconds since 1/1/1970)
-
required memory space: 2 Bytes/value (max. 262144 values = 512*1024 Bytes : 2 Bytes/value)
Alarm Mode
-
storage starts as soon as the measuring values have reached or exceeded the limits of the set-up
normal range (analog) or level (digital)
-
scan starting time and relative time referring to the start of the measurement is stored in UTC format
(number of seconds since 1/1/1970)
-
required memory space: 7 Bytes/value
(max. 74898 values = 512*1024 Bytes : 7 Bytes/value)
-
alarm values are set for each channel separately
-
storage of either all channels to be saved or only of channels which are in state of alarm
-
If measuring values are within their normal range again, the scan is temporarily interrupted. If not in
Loop Mode
(see below) the scan continues until memory is full or measurement is stopped.
-
even if a scan has been stopped with the device button it can be taken up again, the new measuring
data and time values are correctly added to the previous measurement
-
in case of alarm the two digital outputs become active (Digital Out 1: 1
Æ
0; Digital Out 2: 0
Æ
1) and
the relay is switched (alarm outputs, see chapter 3.2)
Loop Mode
-
loop memory: if memory is full old measuring data are continuously overwritten, if reading out
sampled data during a scan, they are removed from the memory
-
if
Loop Mode
is not selected, the scan is finished when reaching the memory capacity
Sleep Mode
-
energy-saving mode: turns off the external power supply, the serial and USB interface and the alarm
outputs
-
changes into
Sleep Mode
1 minute after turning on the
meM-LOG-SE
-
to "wake up" the device for 1min: shortly press (<0.5sec) the pushbutton at the front of the device
("Instant on", see chapter 4) or apply a "break"-signal at the serial interface (for at least 4sec)
-
If the
meM-LOG-SE
has a connection to the operating software ST-meM-LOG SE it does not fall
into
Sleep Mode
.
-
Shortly before scanning the next value
meM-LOG-SE
wakes up, writes it to the memory (
Alarm
Mode
: if in alarm) and falls asleep right away. The time before scanning can be set in steps of sec-
onds within the range of [0sec, .. , defined scan period].
Æ
only in
Normal Mode
possible, the de-
vice does not sleep in
Fast Mode
!
