User Manual

Table Of Contents
Control concept
Control concept and control blocks
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Function Inputs Description AI_RED AO_RED BI_RED BO_RED MI_RED MO_RED
Stop transmission
of input signal
OoServ Out of service
DefVal Default value
Priority mechanism PrioArr Priority array
Local override Ovrr Override
OvrrVal Override value
Alarm value
monitoring
- Limits
- Reference values
- Monitoring
periods
EnAlm Alarm enable
HiLm Upper limit
LoLm Lower limit
Nz Neutral zone
RefVal(s) Reference value
TiMonOn Monit. time
switch-on
TiMonOff Monit. time
switch-off
TiMonDvn Monit. time
deviation
Switching delays DlyOn Switch-on delay
DlyOff Switch-off delay
TbTiDly Table for time
delay
Switching action
- Normal
- Release command
- Trigger
SwiKind Switch kind
Function Outputs Description AI_RED AO_RED BI_RED BO_RED MI_RED MO_RED
Feedback
monitoring
PrVal Present value
FbVal Feedback value
Reliability
monitoring
Rlb Reliability
Fault monitoring Dstb Fault
Status monitoring TraSta Transitional state
Priority monitoring SftyActv Safety priority
Active
CritActv Critical active
PgmActv Program active
PrPrio Present priority
Priority mechanism
Within the Desigo PX system, the BACnet priority mechanism is used for the I/O output blocks and in the
value blocks. This priority mechanism provides a series of prioritized levels at which intervention is
possible, for use with the control functions in HVAC plant and the associated components.
The following priority levels are available with blocks AO, BO, MO (and blocks AO_RED, BO_RED, MO_RED)
and AVAL, BVAL and MVAL.