Setting and adjusting setpoints - Basic Documentation - RDF600KN - RDF600KN/S - RDF600KN/VB

Semi-flush mount room thermostats with KNX communications RDF301, RDF301.50, RDF301.50H, RDF600KN, RDF600KN/VB, RDF600KN/S

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Desigo PX Open
Desigo Open
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Thermostats (temperature controller with sensor)
Building automation
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Technical Documentation > Basic Documentation
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Room temperature setpoints can be

  • set during commissioning

  • adjusted during runtime

Comfort basic setpoint
Comfort setpoint
Economy heating setpoint
Economy cooling setpoint

The source can be

  • the local HMI

  • a tool

  • a central control unit

The thermostat stores the setpoints

  • in EEPROM in the form of parameters

  • in the runtime memory

The table below shows the interrelations:

1) Only required for heating AND cooling applications (see section 3.6.8 Setpoints and sequences).

2) LTE Mode: the shift is added to the local shift.

3) S-Mode: the last intervention wins, either S-Mode input or local operation.

Current setpoint

The current setpoint (used by the thermostat for temperature control) is available on the bus for use in the central control unit.

General notes:

  • The supported communication objects are different in LTE Mode and S-Mode.

  • Changes via the local HMI or via tool have the same priority (last always wins).

  • Setting the Comfort basic setpoint will reset the runtime Comfort setpoint to the basic setpoint.

Notes on setpoint adjust­ment (LTE Mode with Synco only)

  • Central setpoint shift is used for summer / winter compensation in particular.

  • Setpoint shift does not affect the setpoints stored in parameters P08, P11, P12, P33.

  • Local shift and central shift are added together.

  • Applies only to Comfort and Economy setpoints; Protection setpoints are not shifted centrally.

  • The resulting (current) setpoint heating and cooling is limited by the Protection setpoint; if Protection setpoint is OFF, then minimum 5 °C and maximum 40 °C are used.

  • The resulting setpoints for cooling and heating of the same operating mode have a minimum distance of 0.5 K between them.

  • The result of local and central shift, together with the room operating mode, is used by the thermostat for temperature control (current setpoint).

Setpoint priority,
Setpoint Master RMB

  • The room thermostat always adopts the received setpoints from the controller RMB795. Thus the Comfort setpoints locally adjusted on the RDF600KN, RDF600KN/VB room thermostats are overwritten by the Comfort setpoints of the room group
    (i.e. within every 15 min).


  • On RMB SW Version >= 2.0 it is possible to define under which circumstances the controller has to send out the setpoints:

    - Always (every 15min)

    - Not in Comfort mode

    - Only when changed

  • See "Setpoint priority" and "Setpoint Master" functions on RMB795B.

  • RDF600KN, RDF600KN/VB SW version < V1.8: The local Comfort setpoints are overwritten only if the RMB setpoints are changed.