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Difference formation Yes<br />
No<br />
Start value for difference<br />
formation<br />
Poll object cyclically Yes<br />
No<br />
Order-No. 7574 00 1X<br />
Month (31 intervals<br />
of 1 day)<br />
Year 1 (12 intervals<br />
of 1 month)<br />
Year 2 (52 intervals<br />
of 1 week)<br />
Software "...590101"<br />
Parameters<br />
and maximum interval value determined.<br />
In addition, an average value is calculated<br />
and saved.<br />
If the data source is a counter<br />
(e.g. electricity meter, people counter,<br />
etc.), data recording can be switched to<br />
differential calculation here. In so doing,<br />
a differential between the last received<br />
value and the last value of the previous<br />
period is calculated and stored as a display<br />
data value in the panel. No calculation<br />
of minimum, maximum or average<br />
values take place. The calculated data<br />
value differentials then, in the case of an<br />
electricity meter, directly represent the<br />
consumed units of power within a recording<br />
period (e.g. month or year).<br />
0 After a device reset (power failure, programming<br />
operation), the differential calculation<br />
starts at a specified starting<br />
value. This is required to initialise the<br />
differential formation, so that a differential<br />
value can be calculated in the first<br />
recording period after a reset. This<br />
means that, in addition, there can be an<br />
adjustment to defined basic counter<br />
levels - for example after the installation<br />
of a new electricity meter.<br />
The system project planner must enter<br />
the starting value here.<br />
A distinction must be made between two<br />
different cases:<br />
If a value is entered in the parameter<br />
box (standard value = "0"), the value<br />
then evaluates the last data value of the<br />
first time period after the reset directly<br />
and then shows the difference to the<br />
starting value in the display diagram. Alternatively,<br />
the parameter field of the<br />
start value can be left empty here. In this<br />
case, the panel automatically evaluates<br />
the first data value received as the start<br />
value.<br />
This parameter is only visible on "Differential<br />
formation = Yes".<br />
With activated cyclic polling, the panel<br />
transmits a value read telegram<br />
(ValueRead) to the bus regularly, after a<br />
period of time has elapsed. The data<br />
source must then return a value re-<br />
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