Point On/Off Scan; Analogue Range/Scaling; Analogue Limits - MultiTrode MultiSmart Installation & Operation Manual

40.6 Point On/Off Scan

WITS incremental record type 1,000 defines whether each point is on or off scan. This can be configured
for the following point types:
•
Binary inputs
•
Binary outputs
•
Counters
•
Analogue inputs
•
Analogue outputs
For each point, this controls the following configuration parameter:
Point On Scan?

40.7 Analogue Range/Scaling

WITS incremental record type 1,002 defines the range and scaling for analogue points. This can be
configured for the following point types:
•
Analogue inputs
•
Analogue outputs
There are a number of different tag types which can be assigned to analogue inputs / outputs. Of these,
only two tag types permit scaling:
•
Analogue tags
•
Analogue control tags
For these tag types, the scaling factors are saved to the following attributes of the tag:
•
Raw Min
•
Raw Max
•
Scaled Min
•
Scaled Max
For all other tag types, these attributes don't actually exist, and only a scale of 1:1 is supported.
The Range Minimum and Range Maximum fields are saved to the following attributes of the tag:
•
minValue
•
maxValue
The Units field is saved to a Units tag for each analogue input and output. Nothing is done with these
units, except to save them so that they can be returned to the master when an incremental upload is
requested.

40.8 Analogue Limits

WITS incremental record type 1,003 defines limits for analogue input and analogue output points.
Analogue Limits are implemented by the Analogue Watcher application in the MultiSmart. This application
is responsible for determining when limits are transgressed. The configuration for these records is stored
under AnalogWatcher.Analog Limits.
For most parameters, the Analogue Watcher configuration maps directly from the incremental
configuration. There is one field for each point limit which deserves more attention. A Description field
exists for each point limit, which is not identified by the incremental record. This description is an optional
field, and is used when writing limit alarms to log files.
When the WITS action of a point limit is identified as 1 (log only), an analogue limit trigger will write an
entry into the event logger's log file. This log file can then be viewed via the History page on the
MultiSmart LCD. When the Description field for a point limit is unpopulated, the entry in the History page
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MultiSmart Installation & Operation Manual
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