Table of Contents
Advertisement
ABB i-bus
EIB / KNX
®
5.5
Cyclical monitoring
Planning and application
In order to ensure that the control of an object does not fail, the actuator
can implement timed monitoring of the input and/or forced control for each
of its outputs. In 8-bit mode the communication objects "Switching" and
"Dimming" are not monitored.
If this monitoring is activated, a time between 10 seconds and 2550 seconds
(= 42.5 minutes) can be set. If none of the monitored communication objects
receives a telegram within this time, the object assumes the value which
can be set in the "Output value after exceeding of the monitoring time"
parameter. Additionally, the output can issue a message with the communi-
cation object "Alarm Output ...".
Fig. 12: Forced control and monitoring
Fig. 10 indicates the interaction between the communication objects "Input
value" and "Forced control" in conjunction with monitoring. The arrows indi-
cate the times for the telegrams.
With inactive forced control the object "Input value" defines the state of
the output.
If "Forced control 2" becomes active, the output assumes the
parameterised value (here: 70 %).
Telegrams to the object "Input value" are not carried out. However,
the value is stored internally.
„Forced control 1" has the higher priority after activation.
(here: 90 %).
If the monitoring time is exceed the output switches to the alarm state
(here: 50 %).
A further telegram to the object "Input value" ends the alarm state.
"Forced control 1" is again active.
With completion of "Forced control 1" the "Forced control 2"
becomes active.
Changes to the "Input value" object in the meantime are stored internally
and not implemented.
The internally stored input value is reactivated after forced control
has ended.
25
Advertisement
Table of Contents
