Handling Faults - Siemens RDG100KN Basic Documentation

# Function of
input
6 Fault
K NX
R
Fault
information
7 Monitor input
K NX
R
(Digital)
D1, X1, X2
(Digital)
8 Monitor input
K NX
R
(Temperature)
X1, X2
(Temp.)
Temperature out
of range
K NX
R
Siemens
Building Technologies
Description
Digital input to signal an external fault (example: dirty air
filter).
If the input is active, "ALx" is displayed and a fault is
sent on the bus. See also section 3.11.8.
(Alarm x, with x = 1 for X1, x = 2 for X2, x = 3 for D1).
Note : Fault displays have no impact on the thermostat's
operation. They merely represent a visual signal.
Digital input to monitor the state of an external switch via
bus.
Sensor input to monitor the state of an external sensor
(e.g. QAH11.1) via bus.

Operational action can be changed between normally open (NO) and normally
closed (NC) via parameter P39, P41 (or P43 if it is a digital input)

Each input X1, X2 or D1 must be configured with a different function (1...5).
Exception: 1, 2 or 3 inputs can be configured as fault (6) or monitor input (7,8)

X1 is factory-set to "External sensor" (1), X2 to "Not used" (0), and D1 to
"Operating mode switchover" (3)
For more detailed information, refer to section 3.4 "Applications".

3.10 Handling faults

When the room temperature is outside the measuring range, i.e. above 49 °C or
below 0 °C, the limiting temperatures blink, e.g. "0 °C" or "49 °C".
In addition, the heating output is activated if the current setpoint is not set to "OFF",
the thermostat is in heating mode and the temperature is below 0 °C.
For all other cases, no output is activated.
The thermostat resumes Comfort mode after the temperature returns to within the
measuring range.
For fault status messages on the bus, see section 3.11.8.
RDG100KN Basic documentation
Functions
Type Type
X1/X2 DI
DI DI
DI DI
AI --
51 / 86
CE1P3191en
22 Jun 2010