DESIGNER’S HANDBOOK 4189350049C EN
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When the
“VI relay active” is set up, the “Name” and the “Index, Sub-index” defines which data type or flag is
controlling the relay output. Example: we want the relay 1 to be controlled by Propeller RPM instance 1, then the
object index will be 0x3081 (Prop. RPM instance 1), and the sub-index 0x02 (actual data) or in the notation used in
the menu: 0x3081:0x02. If the relay should instead react on set point data for propeller RPM 1, then the sub-index
must be 0x07.
11.11.4.1
Activate inside critical band
All normal variable data (like RPM) has up to 4 critical bands where Max and Min. can define warning marks on the
indicator scale as previously described. But the same critical bands can also be used to define boundaries for relay
functions.
If for example
“VI relay active” is set up to “Activate inside critical band” and critical band 1 is set to “ON”, then the
relay will activate when the data value is within the boundaries (max/min) of critical band 1. The relay event mode
(ND/NE) will define how the output will act as previously described.
More than one critical band may be activated at a time.
11.11.4.2
Activate outside critical band
This function works similar to the function “Activate inside critical band”. In this case, the relay is activated when the
data value is outside the active critical band(s).
More than one critical band may be activated at a time.
11.11.4.3
User-defined relay activation band
It is also possible to insert one additional custom relay activation band. The user defined band is activated by
inserting the required low and high value defining the band boundaries.
If the low and high values are the same (for example 0), the user-defined band is disabled.
The user-defined band may be used separately or in addition to the 4 critical bands.
