User Manual

Logical I/O blocks
General functions
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Priority entry 6 is used to forward the switch commands resulting from [PrioArr]
to the [PrVal] output after a delay. This enables you to implement both switch-
on and switch-off delays and minimum ON and OFF times.
For this purpose, the internal block logic imports the Present value [PrVal] into
the priority 6 entry. While the delay times referred to above are running, priority
6 is set to active and so takes priority over priority levels 7…16. Outside these
delay times, priority 6 is always inactive.
Locating this function in the [PrioArr] between priorities 1…5 and 7…16 has
the following consequences:
● Commands with a priority level of 1…5 are always executed immediately,
irrespective of any currently active delay times.
● Commands with a priority level of 7…16 are always overridden by any
currently active delay times.
Unlike all the other entries in [PrioArr], the commands and information bit for
priority 6 are generated exclusively by the BO, MO, BVAL and MVAL blocks. A
priority 6 entry cannot be written from an external source.
As soon as one of the commands with a priority of 7…16 determines the [PrVal]
which will therefore cause the present state of [PrVal] to change, the entry for
priority 6 is set up as follows:
If the switch-on delay [DlyOn] or switch-off delay [DlyOff] is greater than 0:
1. Priority 6 adopts the still unchanged present value [PrVal].
2. Priority 6 is set to active.
3. The switch-on or switch-off delay timer starts.
4. After expiry of [TiOnMin] or [TiOffMin], priority 6 is set to inactive.
If the delay times [DlyOn] or [DlyOff] are equal to 0, no action is taken.
If the new value which determines [PrVal] is the same as the current [PrVal],
then, here too, no action is taken.
2
5
8
14
16
15
13
9
7
6
3
1
PWR_CTL
CMD_CTL
ValPgm / EnPgm
PrVal
ValCrit / EnCrit
Desigo CC
ValOp / EnOp
BOAO MVAL
e.g. local manual
switch
Local control
e.g. anti-icing
protection
e.g. emergency stop
Priorities 1, 4, 7, 15
via data flow interconnection
Local control
General BACnet command
Life safety
Critical value
Monitoring hours
Manual operation
Program control
Priority 6
Control within block
Priorities 2, 5, 8, 14, 16
via BACnet command
Higher control
Priority 6
The switch-on and
switch-off delay