Percentage change in item value that causes subscription callback
You configure DeadbandPercent
to a value between
0
and 100
. The default value is
0
, which specifies that any value change will update the OPC
server's cache. A non-zero value results in the cache value being updated only if
the difference between the cached value and the current value of the item exceeds
DeadbandPercent
* (High EU
-
Low EU
) / 100
The DeadbandPercent
property only affects items that have an
analogue data type and 'High EU'
and 'Low EU'
properties defined (Property IDs 102
and 103
respectively). You can query data types and item properties using serveritemprops
.
Note
OPC servers may not implement the DeadbandPercent
property
behavior, even for values that have High EU
and Low
EU
properties defined. For servers that do not support
DeadbandPercent
, an error will be generated if you
attempt to set the DeadbandPercent
property to a value other
than 0
.
DeadbandPercent
is applied group wide for all analog
daitem
objects, and is used to prevent noisy signals from
updating the client unnecessarily.
Access |
Read/write |
Applies to |
|
Data type |
double |
Values |
Any value from |