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Siemens Desigo SX Open - SX Configurator, V2.1 CM110702en_06

Building Technologies Worksheets in SX Configurator 20 Mar 2012

Column Description

Describes how to get the monitored value:

0 = use confirmed COV notification

-1 = use unconfirmed COV notification

Log interval

>0 = poll monitored object and use supplied value as poll interval

Buffer size

Size of the temporary trend buffer for each object. The amount of space required

for the trend log objects in the working memory of the SX PC depends on their

number and on the buffer size, and is in direct competition with other applications,

e.g. other SX components.

The buffer size should therefore be defined so as to achieve the optimum

relationship between data logging (LogInterval) and storage in Desigo Insight.

Recommendation Desigo generally limits the size of the trend log object buffer to a maximum of

5000 entries. For SX Open there is also no point in generating buffers that are

larger than this.

COV resubscripiton

interval

Describes the time between COV resubscription of a monitored object.

Currently only a COV resubscription of 0 (unlimited lifetime) is supported.

Client COV Increment

Describes the COV increment between two values received or read before storing

a new value in trendlog buffer.

Start time

When to start logging of data.

Stop time

When to stop logging of data.

Describes the behavior, if log buffer is full:

0 = overwrite the oldest entries in log buffer

Stop when full

1 = stop logging further data

Record count

This value may not be modified, it is used if an upload of trendlog objects occurs

Notification class

The value of the first active row will be used as notification class for all trendlog

objects. If different values are entered in different rows all values will be adjusted

to the value of the first active row.

Notification threshold

The amount of data in trendlog buffer before an event will be sent to all registered

recipients. If the warning limit is reached (BACnet property "Notification

Threshold"), the complete memory content is transferred to a BACnet client for

evaluation and archiving. It is advisable to set the warning limit at 40 to 60%.

The trended values can also be logged in text form in a file. This can be useful in

the commissioning phase, for example, when a trend upload to a BACnet client is

not yet possible.

For more information on the trend function in SX Configurator, refer to the Engineering

Guidelines [1].

Trend log file archive

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