User Manual

Logical I/O blocks
General functions
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There are two options:
1. Override via a BACnet client:
The override of an output or value object is based on the priority array [PrioArr] in the object. Priority 8 is
reserved for the operator, that is, an override from the PXM20 and Web client is written to the Priority 8
entry. Other BACnet clients can write to other priority entries.
The value (Value or Null) is stored in the [PrioArr]. After processing in the object, the value, other than
NULL, with the highest priority is transmitted to [PrVal]. If there is no active priority, the [DefVal] is
transmitted.
2. Override via the online test mode in Xworks Plus (XWP):
[PrVal] is an output and can therefore not be modified. In this case the value under [EnOp] must first be
set, after which the modifiable value under [ValOp] is written to Priority 8 in [PrioArr]. After processing in
the object, the value, other than NULL, with the highest priority is then transmitted to [PrVal]. If there is no
active priority, the [DefVal] is transmitted.
Runtime totals
Runtime totalization can be implemented in the binary input, binary output and multistate input and output
blocks (BI, BO, MI and MO). Part of the overall range of functions is defined by the BACnet standard. In
order to provide the complete range of runtime totalizing functions required in the field of building
automation and control, certain proprietary enhancements have been added here.
[PrioArr]
Desigo PX
[OoServ]
[DefVal]
[EnOp]
[ValOp]
[EnPgm]
[ValPgm]
[PRVal]
[StaFlg]
[Rlb]
BACnet Service:
WriteProperty [PrVal], Value, [Prio]
WriteProperty [PrVal], NULL, [Prio]
ReadProperty [PrioArr]
Online test mode
in PX Design
BACnet clients