Bedienungsanleitung Siemens RDF301.50 (Seite 55 von 82) (Englisch)

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Siemens RDF301, RDF301.50, RDF600KN Basic documentation CE1P3171en

Building Technologies Functions 2012-10-04

3.12.2 Description of communication objects

Obj Object name Function Type/ length Flags

1 System time Time and

date

19.001

8 Byte

CWU

System time for display on the room thermostat. See parameter

P07 (3 or 4)

3 Time of day Time and

date

10.001

3 Byte

CWU

Another object for receiving the time of day for display on the room

thermostat. See parameter P07 (3 or 4)

4 Fault information Alarm

Info

219.001

6 Byte

Common alarm output. If an alarm occurs, the alarm number is

transmitted

5 Fault state Faulty /

normal

1.005

1 bit

Common alarm output. If an alarm occurs, the alarm flag is set

6 Fault

transmission

Enable /

disable

1.003

1 bit

CWU

A supervisor alarm system can disable the broadcasting of alarms

by the devices. This has no impact on the local display of alarms.

After a timeout of 48 hours, the sending of faults will automatically

be enabled again.

7 Room operating

mode:

Preselection

Auto

Comfort

PreComf.

Economy

Protection

20.102

1 Byte

CWTU

Controls the room operating mode selection of the thermostat via

bus.

The command can also be submitted as four 1-bit communication

objects (8...11). The last interaction wins – either from local

operating mode button or via bus.

Note: The thermostat will transform Precomfort either into

Economy or Comfort (selectable via P88).

Operating mode:

Preselection

Auto

Comf

Eco

Prot

Trigger 1.017

1 bit

Switch room operating mode to either Auto, Comfort, Economy or

Protection.

The last interaction wins – either from the local operating mode

button or via bus.

12 Room operating

mode: Time

switch

Comfort

Economy

PreComf.

Protection

20.102

1 Byte

CWU

This information is provided by a central time switch or a

supervisor and defines the actual HVAC operating mode.

The command can also be submitted via three 1-bit

communication objects (13...15).

Protection has the highest priority and cannot be overridden.

Note: The thermostat will transform Precomfort either into

Economy or Comfort (selectable P88).

Time switch

Comfort

Economy

Protection

Trigger 1.017

1 bit

Switch the HVAC mode to either Comfort, Economy or Protection

mode.

Obj Object name Function Type/ length Flags

16 Room operating

mode: State

Comfort

Economy

Protection

20.102

1 Byte

CRT

Effective room operating mode used by the thermostat

(considering time switch, user selection, window contact, etc.) This

state information is available via one 8-bit enumeration or three 1-

bit communication objects (17...19). Note: The thermostat does not

support Precomfort.

Room operating

mode:

State Comfort

State Economy

State Protection

OFF

1.002

1 bit

Corresponding communication object sends "True"

20 Window state Open

Closed

1.019

1 bit

CWU

The thermostat is set to Economy mode if value “1” (open) is

received. It switches back to the previous mode when the value is

“0” (closed).

"Window state" is sent e.g by a KNX switch or a KNX presence

detector. It has the same effect as the local operating mode

switchover contact X1, X2 (parameter P38, P40).

Only one input source must be used, either local input X1/X2 or

KNX bus.

21 Room

temperature

Temp .

value

9.001

2 Bytes

CRT

The value of the room temperature measured via built-in or

external sensor is available via this communication object.

22 Room tempera-

ture: Comfort

basic setpoint

Temp .

value

9.001

2 Bytes

CWU

If function "Temporary setpoint" is enabled via parameter P69, then

after an operating mode change, the setpoint adjustments made by

the user and via communication object 23 will be dismissed and

the thermostat will be reset to the Comfort basic setpoint.

Note: Setpoints that have been changed via the local HMI may be

overwritten during a system startup from a central master

controller, e.g.RMB795.

The Comfort basic setpoint is stored in EEPROM (see section

3.3.2).



The service life of the EEPROM depends on the number

of write cycles. Never write this communication object cyclically!

23 Room

temperature:

Comfort setpoint

Temp .

value

9.001

2 Bytes

CWTU

Communication object used to shift the setpoint used by the

thermostat (see section 3.3.2). Same priority as local setpoint shift

on the ther

mostat. The last intervention wins.

Note: The Comfort basic setpoint (object 22) will not be changed.

24 Current setpoint Temp .

value

9.001

2 Bytes

CRT

Current setpoint, including shift, compensation, etc., used by the

thermostat for temperature control

25 Heating output

primary

0…100 % 5.001

8 bit

CRT

Indicates the position of the heating actuator of first stage.

E.g. 2-pipe with electric heater application: Output of heating coil.

26 Heating output

secondary

0…100% 5.001

8 bit

CRT

Indicates the position of the heating actuator of the second stage.

E.g. 2-pipe with electric heater application: Output of the electric

heater.

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