ABB SM500F User Manual page 87

SM500F
Field mountable paperless recorder
The recorder can be configured to sample all recording channels in the group simultaneously and store the
data in internal memory and external archive media (if archiving is enabled) at two rates, Primary and
Secondary.
The Primary sample rate is active during normal process operating conditions and is set typically to a
relatively slow rate (depending upon process recording requirements) in order to maximize internal memory
and external archive media capacity.
The recorder can be configured to switch to a faster (Secondary) sample rate when a selected digital
source becomes active in order to record the maximum amount of detail for the period in which that source
is active; or it may be switched manually from the 'Logging' Operator menu – see Section 5.2, page 50.
•1 If this parameter is changed, internally recorded data files are recreated and unarchived data is lost.
IM/SM500F Rev. Z
Set the Primary sample rate to between 0.1 seconds and 720 minutes (12
•1
hours). The table below compares example sample rates with the
equivalent chart speeds of a traditional chart recorder together with the
storage capacity of internal memory. refer to Appendix C, page 162 for full
details of internal memory and external archive media storage capacity.
Sample Rate
1 second
3 seconds
6 seconds
12 seconds
36 seconds
72 seconds
Note.

Sample rates are set using one of the following combinations of
units:
– Minutes or minutes and seconds
– Seconds
– Tenths of seconds (minutes and seconds must first be set to
zero).

The rate at which data is displayed in the Chart views is set
separately – see 'Screen interval', page 87.

The fastest sample rate setting determines the maximum screen
interval that can be selected – see Table 4.1, page 32.
Set the Secondary sample rate to between 0.1 seconds and 720 minutes
•1
(12 hours).
Equivalent Chart Speed
720mm/h
240mm/h
120mm/h
60mm/h
20mm/h
10mm/h
7 Configuration
On-board Storage Time
(4 Channels)
6 days
18 days
1.1 months
2.3 months
7 months
1.2 years
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