Campbell SAT ARGOS Manual de usuario Pagina 312

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ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048 Page D-8
1.10. Trend Data Process
Inputs: 4 Any sensor, process or constant output
5 Trend time scale in hours
6 Significant trend per hour
Outputs: 1 Hourly data trend
2 Immediate hourly trend
3 Trend direction
E1 Process error code
Assumptions: None
The Trend Data Process calculates the directional trend of the incoming data with respect to time. The
Immediate Trend data (output 2, indicated by ‘r’) is the trend of the most recent data with the previous
data and is calculated using the following equation:
D
0
is the most recent data, D
1
is the previous data, t
0
is the time of the most recent data and t
1
is the time
of the previous data.
The Hourly Data Trend (output 1, indicated by ‘R’) is the trend over the indicated time scale in hours
(input 2, indicated by T
s
). The following equations are used to calculate the Hourly Trend Data:
R
0
is the current, hourly data trend and R
1
is the past-hourly data trend.
The Trend Direction (output 3, indicated by D
d
) takes on one of three values (+1, –1 or 0) which indicates
whether the trend is rising, falling or unchanged as compared to the significant trend (input 3 indicated by
D
s
. The following equation calculates the trend direction:
1.11. Multiple-Input Minimum/Maximum Process
Inputs: 4-11 Any sensor, process or constant output.
12 Minimum Allowed Value
13 Maximum Allowed Value
Outputs: 1 Maximum
2 Minimum
E1 Process error code

3600/
10
10
tt
DD
r
xrRxR
10
1
S
S
S
d
DR
DR
DR
D
0
0
0
,1
,0
,1
S
T
tt
x
3600
10
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