IDEC MICRO/I HG4G-CJT22 F-B Series, Руководство пользователя, Страница: 239 / 1665

WindO/I-NV4 User’s Manual
3-133
7 BACnet Communication
3
Communic
ation
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/I BACnet 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.