WindO/I-NV4 User’s Manual 3-133
7 BACnet Communication
3
Communication
Writing the Value of a Device Address as Present_Value or Writing Present_Value from a BACnet Device
The items used in the above diagram are described in the following table.
Writing from a Device Address
Item Description
Present_Value for reading This device address stores Present_Value read from the BACnet device.
Present_Value for writing This device address stores the value to be written to the BACnet device as Present_Value.
Device for priority
This device address stores the index number in the array (Priority_Array) where the priority
value is stored.
Device for write trigger
When this device address is 1, the value stored in the Present_Value for writing is stored in
Priority_Array at the index number stored in device address for priority.
Present_Value Prevent_Value held by the BACnet object in the MICRO/I.
Priority_Array Refer to “Priority_Array” on page 3-145.
Read value Current Present_Value.
Write value Present_Value to be written from the BACnet device.
(1) When bit 15 of Device for priority is 0 and the value of Device for write trigger changes from 0 to 1, writes
the value of Present_Value for writing to the Priority_Array at the index number stored in the bit 4 to 0 of
Device for priority.
(2) Device for write trigger is automatically reset to 0.
(3) 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. (The value of Priority_Array at the index number is used as Present_Value until it is reset
to NULL(00h).)
MICRO/IBACnet device
BACnet objects Device addresses
Present_Value
Priority_Array
1
Present_Value
for reading
Read value
Write value
Priority
Present_Value
for writing
Device for priority
Device for
write trigger
2
3
∙∙∙
16
(1)
(2)
(4)
(3), (5)
When bit 15 of Device for priority is 1 and the value of Device for write trigger changes from 0 to 1,
NULL(00h) is written to Priority_Array at the index number stored in Device for priority.
For details about the bit assignments of the Device for priority, refer to “Analog Value Object” in “Top device
for priority and trigger” on page 3-117.
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