User Manual

Logical I/O blocks
General functions
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250 | 351 CM110664en_07
There are two options:
1. Override via a BACnet client:
A BACnet client is overridden with a BACnet service.
Input objects are overridden by setting the out-of-service parameter [OoServ] and writing the desired
present value [PrVal]. The default value [DefVal] is automatically set to the same value as [PrVal]. (You
can also overwrite [DefVal], in which case [PrVal] is automatically used instead).
There is no need to follow these rules when using the PXM20 to override a value, as the operator unit
observes them automatically.
Overridden input objects are not reset automatically. To do this, reset [OoServ] first. [DefVal] remains at
the last overridden value and [PrVal] is again derived from the physical input.
2. Override via online test mode in CFC:
Overrides with CFC are carried out via a proprietary service.
Outputs of a block cannot be overwritten.
To overwrite [PrVal] the out of service state in [OoServ] must be set to TRUE, after which the default value
[DefVal] can be modified. This value is then adopted (or applied) as the present value and is made
available under [PrVal].
User override of an output value
PXM30/40/50
PXM20
Online test mode
in PX Design
Web client