Technical data

298 • List of all BACnet Properties in Native Operation
Polarity
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
Schedule:
The Out_Of_Service property, of the type BOOLEAN, indi-
cates whether the internal calculations of the schedule object
are used to determine the value of the Present_Value prop-
erty (TRUE) or not (FALSE). This means that the Pre-
sent_Value property is decoupled from the internal calcula-
tions and will not track changes to other properties when
Out_Of_Service is TRUE. Other functions that depend on
the state of the Present_Value, such as writing to the mem-
bers of the List_Of_Object_Property_References, must react
to changes made to that property while Out_Of_Service is
TRUE, as if those changes had occurred by internal calcula-
tions.
6.57 Polarity
Data Type BACnetPolarity
Objects Binary input, Binary output
Description This property, of type BACnetPolarity, indicates the rela-
tionship between the physical state of the input/output and
the logical state represented by the Present_Value property.
If the Polarity property is NORMAL, then the ACTIVE
state of the Present_Value property is also the ACTIVE or
ON state of the physical input/output as long as
Out_Of_Service is FALSE. If the Polarity property is
REVERSE, then the ACTIVE state of the Present_Value
property is the INACTIVE or OFF state of the physical in-
put/output as long as Out_Of_Service is FALSE.
Binary Input:
Therefore, when Out_Of_Service is FALSE for a constant
physical input state, a change in the Polarity property shall
produce a change in the Present_Value property. If
Out_Of_Service is TRUE, then the Polarity property shall
have no effect on the Present_Value property (see Tab.
6-7).
Binary Output:
If Out_Of_Service is TRUE, then the Polarity property has
no effect on the physical output state (see Tab. 6-7).