Siemens LMV36.520A1 Basic Documentation page 104

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Building Technologies Division
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Behavior in the event the building automation and control system fails
If the basic unit system receives no more data from the system, it delivers the output set
via parameter 148. The time that elapses until communication breakdown is detected
can be set via parameter 142.
No. Parameter
142 Setback time in the event of communication breakdown
Setting value:
0 = inactive
1...7200 s
148 Predefined output in the event of communication breakdown with
building automation
Setting values:
For modulating operation, the setting range is as follows:
0...19.9 = burner off
20...100 = 20...100% burner output
For multistage operation, use the following settings:
0 = burner OFF, P1, P2, P3
Invalid = no output predefined by the BAC system in the event of
communication breakdown
Default setting: Invalid
149 Fuel 1: Predefined output in the event of communication breakdown with
building automation
Setting values:
For modulating operation, the setting range is as follows:
0...19.9 = burner off
20...100 = 20...100% burner output
For multistage operation, use the following settings:
0 = burner OFF, P1, P2, P3
Invalid = no output predefined by the BAC system in the event of
communication breakdown
Default setting: Invalid
Setting choices:
a) Output preset with parameter 148 set undefined (--):
In the event communication breaks down, the last valid preselected output is
maintained. The next load controller activated in accordance with the priority
(refer to chapter Prioritization of load sources) ensures control from this output
position.
b) Output preset via parameter 148 set to 0, 20...100%, or parameterized as
multistage:
If communication breaks down, the output requested by the BAC system is set
invalid and the output set via parameter 148 is delivered.

Note
In that case, outputs via load controllers with a priority lower than that of the
BAC system cannot be delivered.
Basic documentation LMV36...
10 Connection to load controllers
CC1P7544en
25.09.2013