User Manual

Table Of Contents
Logical I/O blocks
General functions
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CM110664en_07 247 | 351
Trigger
In the
Trigger
setting, the source of the last command takes precedence. The valid value is written from the
[PrioArr] to the [DefVal] and transmitted to the output. The priority is then released again.
In this setting, Priorities 7…16 are treated equally; Priorities 1…5 have a blocking effect.
The trigger function is used, e.g., for the integration of LON data points. Owing to the event mechanism,
this function is not used for P-bus objects.
Switch
The
Switch
setting is used to generate an ON or OFF pulse of a predefined duration. A command via
BACnet, or the activation of an Enable signal in one of Priorities 7…16 via the data flow connection initiates
an associated pulse (event). The minimum switch-on time [TiOnMin] and/or minimum switch-off time
[TiOffMin] must be set. Setting both times can prevent fast switching operations. Priorities 1…5 have a
blocking effect.
Pushbutton with delay (time extension)
The
Pushbutton with delay
function is like the
Switch
function, except an active pulse can be extended by
another pulse at any time.
Runtimes and monitoring periods
The I/O function blocks are designed for the runtimes and monitoring periods required in HVAC
engineering, and can therefore be used directly as components (motors, dampers, fans, etc.).
Different runtimes and monitoring periods can be set, depending on the function concerned.
Runtimes:
Switch-on/off delay
Minimum switch-on/off time
Ramp-up/-down time
Monitoring periods:
Feedback time with switch-on/off
Feedback signal deviation during operation
Runtimes
Switch-on/off delay
Blocks: BO, MO, BVAL, MVAL
The switch-on/off delay when applied to the switching I/O blocks causes a delayed output if the switch
command was written via Priority 7…16. The delay time affects Priority 6 as described. Switch commands
via Priorities 1…5 are executed without a delay.
Minimum switch-on/off time
When applied to the switching I/O blocks, the minimum switch-on/switch-off time causes the output to be
blocked for a period of time if the switch command was written via Priority 7…16. The minimum switch-
on/off time affects Priority 6 as already described in Section 24.2.1.3. However, switch commands via
Priorities 1…5 are executed immediately irrespective of the minimum switch-on/off time.
Ramp-up/down time