Mitsubishi Electric MELSEC iQ-F Series User Manual page 29

Property operation
■EventState, Reliability, OutOfService, StatusFlags
The following describes the relationship between EventState, Reliability, OutOfService, and StatusFlags.
Property
EventState
Reliability
*1
OutOfService
StatusFlags
*1 The OutOfService property indicates that the object is disconnected from physical input and output.
When the value of the OutOfService property is TRUE, PresentValue, Reliability, and FeedbackValue cannot be written to or read from
the buffer memory. (The same applies to the update counter of the output/value object and the pulse setting value of Accumulator.)
When OutOfService changes from TRUE to FALSE, a value is written to or read from the buffer memory.
When OutOfService changes from TRUE to FALSE, the output update counter is incremented so that changes in the buffer memory can
be detected.
■PriorityArray, RelinquishDefault, CurrentCommandPriority
The value with the highest priority (the lower array element) is set as PresentValue. When all the array elements are NULL,
the value of RelinquishDefault is set as PresentValue.
Set RelinquishDefault in the parameter setting of the engineering tool.
■Scale
Scale is the ratio by which PresentValue is multiplied.
To set the unit shown in Units, perform the following operation after PresentValue is read.
• Value when converted into units [Units] = PresentValue  Scale
■Value_Change_Time, Value_Before_Change, Value_Set
The following figure shows the operation of Value_Change_Time (the date and time when PresentValue was changed by
writing a value to Value_Set), Value_Before_Change (the value of PresentValue immediately before the PresentValue was
changed by writing a value to Value_Set), and Value_Set (writing a value to PresentValue).
Time
Value_Set
PresentValue
Value_Change_Time
Value_Before_Change
Since the Ethernet module does not have a clock, the time set in Value_Change_Time is the time of the FX5 CPU module.
The same applies to other properties where time is set.
Writing the pulse setting value or directly rewriting the current value in the buffer memory using the program does not change
Value_Change_Time and Value_Before_Change.
IN_ALARM
FAULT
OVERRIDDEN
OUT_OF_SERVICE
Writing data from BACnet workstation or
another BACnet controller
...
100 101
...
...
How to determine the value
Fixed to NORMAL (0)
Buffer memory (A value written from the program)
• Buffer memory (A value written from the program)
• A value written from a BACnet workstation or BACnet controllers
Fixed to FALSE
FALSE when the value of the Reliability property is NO_FAULT_DETECTED (0)
TRUE for other cases
Fixed to FALSE
TRUE when the value of the OutOfService property is TRUE
FALSE for other cases
T
1
Writing data from BACnet workstation or
another BACnet controller
300
300
300 301
T
1
101
T
2
0
0
302 0
T
2
302
4 FUNCTIONS
4.2 BACnet Object Function
4
27