User Manual

Table Of Contents
Trending
Trend functions
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Single Run
The trend data is saved until the available memory area is full. You can define the buffer size [BufSize]
within the range 2 to 5,000 entries. You can define the Single Run function with the parameter Stop when
full.
Logging Type
The parameter Logging Type [LogTyp] defines the logging type. The values are:
POLLED: Periodic Sampling
COV: COV Sampling
TRIGGERED: Triggered Sampling
By setting the parameters accordingly, you can define combinations of Continuous Run / Single Run and
Periodic Sampling / COV Sampling / Triggered Sampling.
Periodic Sampling
In Periodic Sampling data is acquired by sampling and storing values in a regular cycle. Periodic Sampling
is supported by the trend log object and the trend log multiple object.
COV Sampling
In COV Sampling data is stored based on a change of value (COV) of the referenced parameter. A COV
subscription can be applied to all supported data types (analog, Boolean and multistate). The amount of
change required to initiate a COV is set as a parameter in the object to be referenced. COV Sampling is
supported only by the Trendlog object.