Campbell SAT ARGOS Bedienungsanleitung Seite 338

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Seitenansicht 337
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048 Page D-34
Value Referenced in Line Item #4 of Two-
Range Alarm
Value Referenced in Line Item #5 of Two-Range Alarm
Process
Below the Threshold defined in Line Item #4
of the Two-Range Alarm Constants Process
Compared to first set of limits (Line Items #5 and #6) of the
Two-Range Alarm Constants Process
Above the Threshold defined in Line Item #4
of the Two-Range Alarm Constants Process
Compared to second set of limits (Line Items #7 and #8) of
the Two-Range Alarm Constants Process
If the value referenced by Line Item #5 of the Two-Range Alarm Process
356
goes beyond the selected
limits, then the alarm condition will be set in the Two-Range Alarm Process.
Consider an example in which a system used to monitor wind loading on power lines. Damage to the
power lines may be caused by high wind speeds, as well as relatively low wind speeds if the temperature
is below freezing and the power lines are covered in ice. In this example, the ZENO
®
-3200 would be
configured as follows:
A temperature sensor would be defined as the input for Line Item #4 of the Two-Range Alarm
Process.
The threshold select decision point, the Line Item #4 of the Two-Level Alarm Constants Process,
would be set to 32ºF.
A wind speed sensor would be defined as the input for Line Item #5 of the Two-Range Alarm
Process.
The First Upper Limit, Line Item #5 of the Two-Level Alarm Constants Process, would define the
maximum allowable wind speed for below-freezing temperatures.
The First Lower Limit, Line Item #6 of the Two-Level Alarm Constants Process, would be set to a
negative number since no wind would not cause a problem.
The Second Upper Limit, Line Item #7 of the Two-Level Alarm Constants Process, would define the
maximum allowable wind speed for above-freezing temperatures.
The Second Lower Limit, Line Item #8 of the Two-Level Alarm Constants Process, would be set to a
negative number since low winds would not cause a problem with above-freezing temperatures.
3.8. Missing Sensor Data Process
Inputs: 4 Sensor process from an SDI-12 sensor
5 Default data value
6 Digital I/O port number (18 to 23)
Outputs: 1 Status
0 no alarm condition
1 alarm condition
2 Sensor data value
E1 Process Error Code
Assumptions: Input number 1 is from an SDI-12 sensor
Activates a digital output (5 VDC) if there is an active alarm condition.
When the ZENO
®
-3200 is unable to collect data from a Sensor Record, then all data outputs for that
Sensor Record are set to Bad Sensor Values (BSVs)
357
. for floating point values, the BSV is the number -
1,000,000.
356
Ibid.
357
Refer to Section 10.4.5.
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