Theben KNX Series Handbook page 40

Designation
Emergency program in case of
actual value failure
Actual value failure telegram
Send cyclically
RAMSES 718 P / RAMSES 718 S
The application programmes RAMSES 718 P/S
Values
with PI controller: 0%,
with 2-point controller:
Off
with PI controller: 10%,
with 2-point controller:
On
with PI controller: 20%,
with 2-point controller:
On
with PI controller: 30%,
with 2-point controller:
On
with PI controller: 50%,
with 2-point controller:
On
always cyclically
only send cyclically in
case of an error
every min
every 2 min.
every 3 min.
...
every 30 min.
...
every 60 min.
Description
The emergency program will only
be executed if the selected
Source for actual value provides
no valid value anymore.
The heating/cooling will then be
controlled with a fixed actuating
value.
This might be the case if only
one Source for actual value is
selected, e.g. only I3.
In case of actual value failure,
the value of the actuating value
for the emergency program will,
depending on the operating
mode (heating/cooling), be
output to the corresponding
object.

As long as at least one
valid actual value remains
available, this will be
continued to be used for
control, and the
emergency program
remains inactive. This is
the case if the average
value is determined out of
2 or 3 sources.
Example:
Average value of internal + I3.
If the sensor at I3 fails, the RTC
controls with the remaining, i.e.
with the internal sensor, in this
case.
The object sends the current
status always cyclically and in
the event of a change:
Error = 1, no error = 0
Only sends in case of an error,
cyclically and in the event of a
change: error = 1.
How often should it be resent?
40