Design and Implementation of HC900 Control System - Allowable Function Blocks for Process and Safety Functions
36 HC900 Process & Safety Controller Safety Manual Revision 1.9
01/14
Trend Rate
The trend block is used to configure up to three
storage rates for the HC900 trend backfill (historical
data collection) feature. Only one trend block is
allowed in a configuration.
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Trend Point
The trend point block is used to configure the data
points to be stored by the HC900 trend backfill
(historical data collection) feature. The data collection
rate for the points configured in the block is
determined by the output pin of the TRND block that it
is connected to. There is a global parameter found
under the Designer Edit menu to select whether trend
points are to be configured by Modbus address or by
Signal Tag. Depending on this choice double clicking
the block will open one of two dialogs to configure the
points to be trended by this block. In either case,
points are added by selecting the line and clicking on
"Add to list". Each trend point block can support up to
50 points. The trend function will support up to 250
points.
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