ABB SM3000 User Manual page 72

...4 CONFIGURATION
...4.5.1 Setting the Recording Parameters
The instrument can be configured to sample all recording channels in the group 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 instrument 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 may be switched manually – see Section 3.4.
•1 A new internal data file for all the recording channels in this group is created if this parameter is changed. All historical data stored
internally for these channels is lost.
70
Set the Primary sample rate to between 0.1 seconds and
•1
720 minutes (12 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 2 for full details of internal
memory and external archive media storage capacity
S a m p e l R a e t
1 s c e o n d
3 s c e o n d s
6 s c e o n d s
1 2 s c e o n d s
3 6 s c e o n d s
7 2 s c e o n d s
Notes.
• 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 View
(screen interval [Horizontal and Vertical Chart View] or
chart duration [Circular Chart View]) is set separately – see
Section 4.5.2.
• The sample rate determines the maximum screen interval/
chart duration that can be selected – see Table 2.1 on
page 14.
Set the Secondary sample rate to between 0.1 seconds and
•1
720 minutes (12 hours).
Select a signal source to enable switching between the
•1
primary and secondary sample rates. Refer to APPENDIX 1
for a description of the available sources.
Note. This signal is edge-triggered. A rising edge (inactive to
active) switches to the secondary sampling rate. A falling
edge (active to inactive) switches to the primary sampling
rate.
Secondary
E q u v i a e l t n C h a t r O n b - o a d r
S p e e d i T m e 6 (
7 2 0 m m h / 5 5 .
2 4 0 m m h / 1 6 4 .
1 2 0 m m h / 1 1 .
6 0 m m h / 2 2 .
2 0 m m h / 6 6 .
1 0 m m h / 1 3 2 .
Primary
S o t a r g e
C h a n n e ) s l
d a s y
d a s y
m o t n s h
m o t n s h
m o t n s h
m o t n s h