Campbell SAT ARGOS Bedienungsanleitung PDF herunterladen (Seite 187)

ZENO

-3200 USER MANUAL

Coastal Environmental Systems (206) 682-6048

Page 179

10.4.5. Process Error Checking and Reporting

Sometimes, the ZENO

-3200 cannot collect data from sensors for one or more reasons:

 Disruption in serial communication with a serial sensor

 Insufficient time to collect data from all configured sensors

200

 Poor electrical connections to a sensor

When the ZENO

-3200 cannot collect data from a particular sensor, the output of that sensor will be set

to a specific value that indicates invalid data:

 -1,000,000 for floating-point data

 0xffffffff for long integer data

 a null string

201

for string data

-1,000,000 or 0xffffffff is referred to as a Bad Sensor Value or “BSV.”

ZENOSOFT

was enhanced to prevent processes from erroneously processing invalid data.

Any process that inputs data from a Sensor or a previous Process Record

that is a BSV will NOT use the BSV in its calculations. Instead, the process

will ignore the BSV and output BSVs of its own, or leave its data unchanged

depending upon the nature of the process.

As a general rule, any process that accumulates data over time to calculate its outputs will simply ignore

BSVs and leave its own data unchanged, but any immediate data outputs will be set to BSVs.

To report that an error has occurred in a process, every process has an extra error output designated as

output E1. E1 is a long integer output. The following types of errors are reported in error output E1:

Bit Meaning

1 Process not evaluated during sample interval.

2 Input data is out of range.

3 Input data is a Bad Sensor Value (BSV, -1,000,000 or 0xFFFFFFFF).

4 Input data is intermittently bad or out of range during sample interval.

5 Input data is questionable (from a process reporting an error).

6 User input data out of range.

7 Internal error (meaning depends upon process).

8 Not defined.

When a process receives a BSV, it will set bit 3. If the process receives the BSV more than once during a

sample interval, it will also set bit 4. If an input to a process has a limited range of acceptable values, and

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This is usually the result of an incorrect configuration.

201

A null string is a string containing no characters. It has a length of zero.

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