Viconics VT8600 Series BACnet Integration Guide Instrukcja Użytkownika Pobierz pdf (Strona 31)

VT8600 Series BACnet

Integration Manual

028-0437-00 www.viconics.com | sales@viconics.com March 2015

Note C1) Conﬁguration Properties and User HMI objects.

The behaviour is similar to the behaviour described in NOTE C with the following exceptions and changes

When writing and binding to the priority array 1 to 3, the controller WILL store and archive to ﬂash memory. As

soon as the new present value is received in priority array 1 to 3, the controller will use this new present value

in all its internal control logics and functions.

When writing and binding to the priority array 1 to 3, the controller internal control logics and functions ARE

bypassed the same way they are when writing to priority array 4 to 16. The controller will NOT operate with

its own present values, but will be forced to use the last write commands received on priority array 1 to 3

for its built-in internal control logics and functions. HOWEVER, since writing to priority array 1 to 3 will store

the value in ﬂash memory, if a power reset occurs, the override type function will be maintained and the

controller will start to operate right away using the last value written to priority array 1 to 3.

The ONLY way to release the override due to the use of writing to priority array 1 to 3 is to send a write NULL

command to the proper priority array currently locking the controller. Only then will the controller start using the

relinquish default value and allow the user or installer to change values.

Note D) Status objects and Physical hardware output objects.

No override functions are effective when writing or binding to the relinquish default property of status objects

and physical hardware output objects. When writing to the relinquish default property, the internal program is

not bypassed and still has priority over the write command on the relinquish default property.

The internal program constantly writes internally to the same location used by the relinquish default property

hence a single BACnet write at relinquish default has no effect on status objects and physical hardware output

objects.

Status and outputs

are processed by the

controller for normal

operation

BACnet Relinquish

Default network write

Internal controller program

under normal operaon

BACnet Relinquish

Default value

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Viconics VT8600 Series BACnet Integration Guide Instrukcja Użytkownika Strona 31