How many expansions does it support?

[ichnusa82]

Good evening, I have not purchased the product yet, but I am very interested. I have some doubts about the KC868-A16 model, namely:

How many relay expansions does it support connected to the bus?
How many relay expansions does it support connected via Ethernet cable?

I ask you this because I have to install them in different places in my house.

Thanks in advance.