Hi everyone,
I’d like to add a Fibaro Smart Implant (FGBS-222) in parallel with an existing 24 V momentary wall switch that controls my shutters. The wall switch currently takes a 24 V supply and, when pressed, sends 24 V to terminal 2A (open) or 2B (close).
Current idea
My plan is to power the Smart Implant from the same 24 V supply as the wall switch/controller (P = +24 V, GND = 0 V). The Smart Implant’s relay outputs would then “simulate” pressing the wall switch by switching +24 V onto the same control terminals:
- P → +24 V supply
- GND → 0 V / GND
- OUT1 → 2A (open)
- OUT2 → 2B (close)
Inputs (IN1/IN2) would remain unused.
The Smart Implant documentation says it can control devices by opening/closing its output contacts independently of inputs, and it supports a 9–30 V supply, so powering it from 24 V should be fine.
Wiring question (OUT1/OUT2)
What I’m unsure about is the relay wiring detail: is it sufficient to connect only a single wire from OUT1 to 2A (and OUT2 to 2B), assuming the other side of those outputs is internally referenced, or do I need to wire a return/common as well?
(From other Smart Implant examples, it seems the external circuit typically needs a complete loop through the relay contact, i.e., the relay closes between a “common” and the target input, but I’m not 100% sure how that maps to my shutter controller terminals.)
Configuration question
If inputs stay unused, what parameters should be changed so the outputs behave like a momentary button press (short pulse), rather than staying on?
From the parameter list, it looks like I should use the output “auto off” timers so OUT1/OUT2 switch off automatically after a short time (pulse), but I’m unsure what value is recommended for shutter controller inputs.
Any feedback?
- Does the approach (powering from 24 V and using OUT1/OUT2 to drive 2A/2B) make sense electrically?
- For the relay outputs: do I need to wire an additional GND/common to the output side to complete the circuit?
- Which output settings (especially auto-off / pulse duration) are typically used for this kind of shutter control?
If anyone has done something similar (Smart Implant + 24 V shutter controller / momentary switch in parallel), a quick wiring sketch or parameter guidance would be greatly appreciated.
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