Question
A KNX "Functional Block" defines a standardised set of Group Objects for a given function (e.g. simple lighting actuator, thermostatic valve), guaranteeing interoperability between manufacturers for that function.
Answer
True
Functional Blocks are standardised interworking templates. Examples include FB Light Switch (DPT 1.001 command + DPT 1.001 status), FB Dimming (DPT 1.001 + 3.007 + 5.001) and FB HVAC Room Controller (10+ standardised Group Objects). Interworking certification verifies that products implement these FBs correctly, which is what guarantees that one manufacturer can be substituted for another without reprogramming.
Preparation tip
When specifying a product, demand the Functional Block compliance list, not just the "KNX certified" logo — the logo alone does not guarantee a clean substitution.
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