17 Function: Data logger
Data backup / limited service life
There is a possibility of loss of data with
all types of data storage. Data loss can
be caused by damage to hardware,
software, or unauthorised access etc.
The operator of the device is respon‐
sible for backing up data, which is
recorded by a data logger. This has to
be done in accordance with the national
and international requirements, regula‐
tions and norms applicable to the oper‐
ator of the device. Define and docu‐
ment this data backup in a backup or
recovery plan.
The manufacturer of the device is not
responsible for backup or recovery of
data.
SD cards have only a limited service
life. This service life is based,
for example, on the general ageing of
the SD card and due to the memory
type (Flash Memory) from the funda‐
mentally limited number of write pro‐
cesses. Bear this in mind with your data
backup strategy and ensure that you
regularly use your SD card.
17.1 Activating, reading and
deleting log books
The controller supports the following log books
by default:
n Calibration log book
n Error log book
Access flap to SD card slot
Always keep the access flap to the SD
card slot closed during operation. If the
access flap is open, extraneous matter,
like dust and moisture, can enter and
cause damage to the controller.
A1177
7.55
7.20
0.50
0.30
25
-15
Fig. 108: Display showing symbol for the pres‐
ence of an SD card (top right)
The data log book (optional)
The data log book is an optional feature. This
option is currently supplied as an industrial
512MB SD card. Unlike
‘consumer’
cards,
industrial SD cards have an operating tempera‐
ture of up to 85 °C and the data is filed twice in
the SD card's memory for security reasons. The
SD card provided has a recording capacity of
around 20 years based on a recording interval
of 10 seconds. SD cards with a capacity of up
to 32 GB can be used and can therefore record
approximately 1,280 years.
Function: Data logger
159
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