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The Fibaro modules have a neat feature that's not widely known.
The Fibaro modules have two switch inputs - S1 is used to control the local load physically connected to the module, while S2 I can be used to control the local load as well as other Z-Wave devices:
This feature makes the Fibaro modules very versatile and yet it's really easy to configure.
By using the secondary (S2) switch input of a Fibaro Module you can easily control other Z-Wave devices. Figure 1 shows a simplified scheme where a Fibaro Dimmer is able to control a number of Z-Wave devices including other Fibaro modules, wall plugs and dimmer sockets.
Figure 1: Simplified scheme to use a secondary switch (S2) with a Fibaro Module.
Once you have wired the modules into your installation, you just need to associate the Fibaro module (dimmer in this example) to the other Z-Wave device or devices. Fibaro uses Group 2 as the channel for this control, configuring this association is straightforward.
Follow the instructions in Application Note 19 - Associating Devices in Z-Wave Controllers - use Group 2 as the association group.