Campbell SAT ARGOS Bedienungsanleitung PDF herunterladen (Seite 336)

ZENO

-3200 USER MANUAL

Coastal Environmental Systems (206) 682-6048 Page D-32

Assumptions: If the Alarm Reset value is less than the Alarm Set-point value then the

alarm is activated when the data value becomes greater than the Alarm

Set-point, and deactivated when it goes below the Alarm Reset

If the Alarm Reset value is greater than the Alarm Set-point value then

the alarm is activated when the data value drops below the Alarm Set-

point, and deactivated when it returns above the Alarm Reset value

This process reads the data input, compares it to the Alarm Set-point and Alarm Reset values, and

activates or deactivates the alarm status accordingly.

If the alarm is set, the corresponding bit in the global BIT value will be set.

348

Any digital output

specified by Line Items #8 or #9 will be set HIGH. Any switched voltage specified by Line Item #10 will

be turned on.

3.4. Data Time-out Process

Inputs: 4 Any sensor or process output

5 Time-out Interval (seconds)

6 Minimum Delta Change

7 BIT bit number (1 to 31, 0 = disabled)

Outputs: 1 Status

0 data has changed within the time interval

1 data has not changed

E1 Process Error Code

Assumptions: None

The Data Time-out Process is an excellent tool to check for faulty sensors or malfunctioning system

components because the process observes how much the input data changes over time:

 The input data is read and compared to a baseline reading.

 If the difference between the two values is greater than the Minimum Delta Change value, then a new

baseline level is established as the current data reading, and the time elapsed counter is reset.

 Otherwise, if the difference is less than the Minimum Delta Change, then the time elapsed counter is

compared to the Time-out Interval. If the time elapsed is greater than the Time-out Interval then the

output status is set to 1 and a bit flag may be set in the global BIT value

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This process is similar to the Static Alarm Process.

350

3.5. Alarm Reset Process

Inputs: 4 Digital I/O port number (18 to 23)

5 Second digital I/O port number (18 to 23)

Outputs: E1 Process Error Code

Assumptions: A reset button provides a switch closure input to channel 24, the IRQ4

channel; this cannot coexist with a tipping bucket sensor which requires

the same input channel

348

Refer to Category #3, Process #1.

349

Refer to Category #3, Process #1.

350

Refer to Category #3, Process #15.

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