[W_DA] Write date

EnWrit

Enable write

If [EnWrit] = 1, writing values from inputs [Val] and [SetValid] to the BACnet object is enabled.
If [EnWrit] changes from 0 to 1, writing occurs.

Boolean

1

Val

Value

Date

01.01.1990

Virtual value, calculated and assigned by the control program to update the present value.
[Val] is used to update the property 'Tracking value'; followed by the BACnet object internally updating the present value with the written tracking value.

[Val] is written, if:

• [SetUnspf] = 0 and [Val] changes
• [SetUnspf] changes
• [SetValid] changes.
• [RptWrit] is 1.

SetUnspf

Set unspecified value

Defines whether an unspecified value on the present value can be written.

Boolean

0

0 - The value from [Val] is written.
1 - An unspecified value is written. ([Val] is ignored)

SetValid

Set valid value indication

A value calculated and assigned by the control program that indicates whether [Val] is reliable.

[SetValid] is mapped to an error code that updates reliability if [EnWrit] = 1 and one of the following items applies:

• [SetValid] changes.
• [Val] changes.
• [RptWrit] is 1.

Boolean

1

0 - Reliability error code 7 (unreliable - other).
1 - Reliability error code 0 (no fault).

RptWrit

Repeat write

Forces writing of [Val], and [SetValid] to the data point. Write is repeated with each program cycle until [RptWrit] = 1.
The control program typically calculates and sets [RptWrit].

Note:
[RptWrit] cannot be permanently forced to 1. This may influence performance and communications traffic.

Boolean

0

0 - No action.
1 - [Val] and [Sta] are written to the data point with each programming cycle.

BaObjRef

BA-Object reference
Link between function block and BACnet object.

Structure

---

BaObjRef
> DeviceID

Device identifier
[DeviceID] includes object type and object instance in one ID.
Identifies the device object: local or remote. A local device object can also be identified by value 16#3FFFFF.

Double Word

16#3FFFFF

BaObjRef
> ObjectID

Object identifier
[ObjectID] includes object type and object instance in one ID.
Identifies the object on a device.

Double Word

16#3FFFFF

BaObjRef
> ItemID

Item identifier
[ItemID] represents an index in a view node object that references the BACnet object.
[ObjectID] and [ItemID] together define an indirect reference to the BACnet object.
Value -1 indicates a direct interface.

Integer

-1

PrVal

Present value

Value of property 'Present value' for the referenced BACnet object.

[PrVal] supplies the last valid value in the event of a fault.

Note
The default initial value for [PrVal] can be changed to another value in the programming editor as needed.

Date

01.01.1990

PrValSta

Present value state

Indicates whether property 'Present value' has an unspecified value.

In the event of fault [PrValSta] indicates the last valid value.

Boolean

0

0 - The value of the property is unspecified.
1 - The value of the property is specified.

Dstb

Disturbed

[Dstb] indicates whether the referenced BACnet object is in fault.

[Dstb] = 1 if:
BACnet object = Error during access
OR
'Status flag' = Fault

Otherwise [Dstb] = 0

Boolean

0

Rlb

Reliability
Indicates the value of property 'Reliability', if the property is available.

Integer

0: No fault detected

ErrCode

Error code indication

Integer

0: No error

= 0 - No error
> 0 - XFB error codes