LOYTEC L-VIS, Руководство пользователя

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L-VIS User Manual 199 LOYTEC
Version 6.2 LOYTEC electronics GmbH

Datapoint Description : This is a human-readable description of the data point.
The maximum length is limited to 64 ASCII characters. International characters
are allowed but will count as 2 or 3 ASCII characters each, due to UTF-8
encoding. If available, the description will also be used as the object description
for L-Vis data point objects referencing this data point.

OPC Tag : If enabled, the data point can be accessed via OPC.

Parameter : If enabled, the data point will be listed in the parameter file. Those
data points are visible in the LWEB-900 parameter editor. A parameter data point
is automatically persistent. See Section 10.1.5.

Use Pollcycle value as : For input data points, this property defines whether the
input shall use a receive timeout or be constantly polling. See Section 10.1.2.

Poll on Startup : For input data points this property defines, whether the data
point shall be polled once at start-up. Poll-on-startup can be enabled
independently of the poll cycle. See Section 10.1.2.

Pollcycle : For input data points, this property defines the poll cycle in seconds.
Set this property to 0 to disable polling. See Section 10.1.2.

Receive Timeout : For input data points, this property defines the receive timeout
in seconds. Set this property to 0 to disable it. See Section 10.1.2.

Min Send : For output data points, this property defines the min send time in
seconds. See Section 10.1.2.

Max Send : For output data points, this property defines the max send time in
seconds. See Section 10.1.2.

Send-on-delta : For output data points this property defines if value updates shall
be sent only once they meet the COV condition of the data point. For analog data
points the analog COV increment is used. If not checked, updates are always
transmitted according to min and max send times. See Section 10.1.7.

Use Linear Scaling : If this property is enabled, the analog values are pre-scaled
from the technology to the data point. This scaling is in addition to any
technology-specific scaling factors and any scaling done by the L-Vis data point
objects referencing this data point. If enabled, the properties
Custom Scaling
Factor and Custom Scaling Offset accept the scaling factors. See Section
10.1.7.

Custom Scaling Factor, Custom Scaling Offset : These properties only exist, if
linear scaling is enabled. They apply to analog data points only. See Section
10.1.7.

Only notify on COV : This property exists for binary and multi-state input data
points. It defines, whether a data point should trigger an update only when the
value changes, or on every write. If this is enabled, consecutive writes with the
same value do not trigger an update. If you want to convey every write, disable
COV on the data point.

Persistent : This property defines, if the last written value shall be stored as a
persistent value. Persistent data points restore that value after a restart from the
persistent storage. See Section 10.1.4.

Default Value : This property defines a default value (see Section 10.1.3). Enter a
default value to enable this feature in the data point. Delete the value entirely to
remove the default value. If no default value is defined, this property reads
“N/A”. The default is no default value.

Historic Filter : This property allows defining historic filters for the scalar data
point. See Section 10.3.5.

Point Type : This is the base data point type, e.g., “Analog Datapoint”.