FB Dimming Actuator Basic explained

• There has to be a 1 bit group object for switching on and off.
• There has to be a 4 bit group object for relative dimming.
• There has to be an 8 bit group object for absolute setting of the dimming level.
• The dependencies between these group objects in the state machine shall be followed.
• The minimal dimming level shall be 01h (0,4 %), or this shall be settable via a parameter.
• The maximal dimming level shall be FFh (100 %), or this shall be settable via a parameter.
• It shall be possible that the full dimming range from 0 % to 100 % and from 100 % to 0 % can be traversed in any direction in 4 seconds or less; if this is not the case, a parameter Dimming Speed shall be foreseen that allows setting this time; for S-Mode applications, if this parameter is a classic ETS parameter mapped on a memory location, the format is implementation specific (as long as it allows indicating how long it takes from 0 % to 100 %); only if this can be set via a GO, 225.001 DPT_ScalingSpeed would be mandatory.
• It shall be possible that there is a binary state output, saying that the lamp is on or off; for this, the Input SOO can be used bidirectional (not recommended), but better (state of the art) is to have a dedicated 1 bit output.
• The same counts for the current dimming level: either the Input can be read (not recommended), or a dedicated Output (DPT_Scaling) shall be foreseen.

These are the minimal requirements. There exist requirements for optional functionality, like “Autonomous Switching Off”, “Timed On Duration”. Only if such functionality is implemented, there are requirements.