Ideas for connecting push button cables to binary inputs?

Maybe someone of you has a good idea:

For cost reasons, I planned all the switches (light switches, blinds, etc.) in our KNX house with a classic switch program (so no "smart" switch modules or high-end ones). To be future-proof (maybe someday something with network/internet as a control unit will come), I ran CAT7 cables everywhere - so no 230V.

So far so good... with this mindset, I gradually wired the whole house. Now, down in the technical room, only 70 Cat7 cables come together, of which I usually only need 2 cores each. And I don’t yet have a smart idea how to properly terminate them. In my test setup, everything was simply terminated with a few Wagos.

In the distribution cabinet, all 230V goes onto Wago TopJobs and can then be conveniently tapped inside. But I don’t want to pull all 70 Cat7 cables in there. That would be too big a mess. Also, I haven’t found anything from Wago for this use case.

So I need some clever termination/wiring idea that can reduce the number of cables or cores and then connect into the distribution.

I know this is very specific. I haven’t heard from anyone yet who has wired like this. But maybe you have an idea what could be suitable... perhaps from another context.

Do I understand this correctly... You planned "normal" switches for cost reasons and now you have 70 (???) switching points in the house? So always one for each lighting circuit, one for each blind (group), etc.? And then each star-shaped to the distributor?

How does the calculation work out? Compared to 2-3 KNX lines with an estimated 15 "smart" push-buttons?
And how do you get the push-buttons onto the bus? Are you using the CAT7 cable as the bus line?

I never said that was smart :)

And OK, the 70 were just an estimate. I hadn’t counted them - it just felt like at least that many. Now I just counted again: It’s actually "only" 48. But yes, as you write, one wire for each function. And star-shaped into the basement. Worst case I can also combine the 4x2x0.25 into 4x0.5 or 2x1.0 and put the KNX bus on it, that’s the idea behind it - but not the actual goal.

In the living room I’ve already laid KNX cables to work with KNX control units and scenes here. But for example for the light next to the bed and other "lower" services I wanted to keep it simple.
Besides, the wife just wants it like before. And that simply needs the simple pushbuttons.
Sure, there will also be presence and motion detectors. But only in the phase when there is money left again. That’s why I’m doing all the KNX stuff myself. That’s also why just ETS light and under 20 devices in the beginning. If I had KNX pushbuttons everywhere, that wouldn’t be feasible.

The standard pushbutton (total cost 10 euros) goes on the BUS via a binary input (I’m looking at the 16-channel ones from MDT, cost per channel 15 euros). That brings me to costs of about 25 euros per pushbutton. That’s already cheaper.

From 4 functions onwards an intelligent KNX control unit pays off. Although I haven’t found anything nice yet that matches our Jung LS990 – but that’s not the topic now.

And now I have the dilemma that I somehow want to bring the relevant wires elegantly into the distribution box.

The calculation doesn't add up ;) For 47 "dumb" switches, depending on the arrangement, you would need, for example, eight 6-way or twelve 4-way push buttons. That makes about €500 or €650 compared to €1,175. The ETS problem could have been solved with multiple projects. I can't say anything against the WAF argument ;) Although I can well imagine that two operating concepts might become annoying for the wife in the long run... But anyways, it doesn't matter now because it's already built as built. I'm not an expert, but somehow you have to bring the wires to the binary inputs. So either you put all the CAT cables in the distribution box on terminal strips and then lead the relevant wires further. Or you do it decentrally, build some kind of CAT sub-distribution somewhere, and then go into the distribution box with only the KNX cable. It strongly depends on the local conditions...

I'm not an expert, but somehow you have to bring the cores to the binary inputs.

Hehe, me neither. And that's exactly what this "somehow" is all about here ;-)

So either you put all the CAT cables on terminal blocks in the distributor and then continue with the relevant cores.

That's already where it starts, as I don't know any decent terminal blocks. Besides, the cables don't fit at all. That's why it has to be an external solution with which I can reduce the number of cables (better the entire cross-section). But yes, exactly for the elegant "picking out" of the relevant cores I'm looking for an idea.

Or you do it decentralized, build some kind of CAT sub-distribution somewhere and then only go with the KNX cable into the distributor. It really depends on the local conditions

There is space next to the distributor. Sooner or later, a server (wall) cabinet will also be placed there. The cables could be routed in, above or below it and connected to something (?) or clamped (?). So to speak some form of the otherwise usual patch panels for CAT cables.

I have connected my control lines to Phoenix terminal blocks: 3213713 ( PT 1,5/S-3L) They are 3.5mm wide and have 3 levels. There are also ones with more levels, but they are considerably more expensive. An LSA distributor should also work.