7 BACnet Communication
3-144 WindO/I-NV4 User’s Manual
Writing a Value to Present_Value from the BACnet Device
(1) The BACnet device writes the write value (1) to Priority_Array at the index number indicated by the specified
priority (1).
(2) Priority_Array with the smallest index number out of all non-NULL(00h) values is element 1 (1), so 1 is used as the
value of Present_Value.
(3) Present_Value (1) is written to the Present_Value for reading (#M0000).
BACnet objects Device addresses
BACnet device
Binary Value
object
Present_Value:
1
#M0000: 1
#M0001: XXXX
#D0010: XXXX
#D0011: XXXX
Reflected
Write value:
1
Priority:
1
MICRO/I
∙∙∙
Priority_Array
11
NULL(00h)
2
03
16
(1)
(2)
(3)
Present_Value
for reading
Present_Value
for writing
Device for priority
Device for write trigger
Element 1 (1) of Priority_Array is used as the value of Present_Value until it is reset to NULL(00h). When
element 1 is reset to NULL(00h), element 3 (0) is used as the value of Present_Value.
For how to write NULL(00h), refer to "Binary Value Object" in “Top device for priority and trigger” on page 3-
123.
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