Table of Contents
Advertisement
Room temperature controller | Room temperature measurement
the object. Possible temperature value changes lie within a range of
0.1 K and 25.5 K. Setting to "0" at this point will deactivate the automatic transmis-
sion of the actual temperature.
In addition, the actual value can be transmitted periodically. The parameter "Cyclical
(0 = inactive)" specifies the cycle time (1 to 255 minutes). The value "0" will deactiv-
ate the periodical transmission of the actual temperature value. If the "Read" flag is
set on the "Actual temperature" object, this makes it possible to read out the current
actual value at any time over the bus. It has to be pointed out that with deactivated
periodical transmission and deactivated automatic transmission, no more actual-tem-
perature telegrams will be transmitted".
Following the return of bus voltage or after programming via the ETS, the object
value will be updated according to the current actual temperature value and transmit-
ted as soon as all the external temperature values of the KNX sensors have been re-
ceived. If no external temperature values have been received after a reset, then the
value "0" will be seen in the "Actual temperature" object. For this reason, all the ex-
ternal temperature sensors should always transmit their current measured temperat-
ure value after a reset.
During room temperature control, the controller always uses the calibrated temperat-
ure values to calculate the command values. The calibrated temperature values can
be actively transmitted to the bus via the "Actual temperature" object.
Monitoring the actual temperature
The cyclical actual temperature monitoring can be activated or deactivated via para-
meter. The parameter "Cyclical monitoring of the temperature inputs" on the para-
meter page "Room temperature controller -> RTCx - General -> Room temperature
measurement" activates or deactivates this function. When cyclical actual temperat-
ure monitoring is active, the device cyclically checks whether the configured input ob-
jects "Room temperature - Measured value 1" and "Room temperature - Measured
value 2" have received new values. The cycle time can be configured by parameter
and applies equally to all temperature inputs.
If the value is not updated within the cycle time on one of the configured temperature
sensors, the controller signals this error via the KNX-compliant controller status
RHCC. Correspondingly, bit 0 ("0" = No error / "1" = Error) of the status telegram (ob-
ject "Controller status RHCC - KNX-compliant) can be evaluated.
The controller remains active even when no input temperature values are received.
The basic levels and the additional levels work with the last received temperature
value and continue outputting command values.
The error status is cancelled when all configured temperature inputs are updated
within a cycle period. Then the status telegram is also updated and transmitted.
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Page 184 of 257
Advertisement
Table of Contents
