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7 BACnet Communication
7.9 Key Properties
Present_Value
●
This property represents the current value. This property handles input and output values associated with objects.
Priority Mechanism
*1
Objects
with Present_Value that can be written from BACnet devices use a priority mechanism with Priority_Array in
which write instructions are ranked and the value of Present_Value is determined. In this case, values cannot be
directly written to Present_Value. To write a value to Present_Value, the value is first stored in Priority_Array
("Present_Value Settings" on page 3-112) at the index number indicated by Priority ("Priority_Array" on page 3-
145). Then the value stored in Priority_Array with the smallest index number out of all non-NULL(00h) values is used
as the value of Present_Value.
*1 Analog Output, Analog Value, Binary Output, Binary Value objects
3-132
WindO/I-NV4 User's Manual
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