Multicell fixtures?

Yes.

Most likely multi-LED fixtures that abound in Rock & Roll today like the Robe Spiider.

but also film lights like Spacelights.

In the theatre, you're most likely to encounter multi-cells in LED batons like the Colorforce series from Chroma Q or similar.

 

Check out ETC's Youtube video on v2.7 for programming details.

Oh OK. They sound just like regular simple RGB LED lights that you need three channels for, but the Robe Spiider had a whole heap more. But what confused me is that the manual goes on to talk about Moving Head lights! Again, to me these are like the RGB LED but have other channels for Pan, Tilt etc. Really down to earth I think you can control any multi DMX address device with the faders. Not so efficient but it can be done. In some cases you have to use different parts of the 0-256 data range to do things. That's why I like ETC boards when I can plug in an exact DMX add AND value to get what I want.

Not on Ion.
Each fixture uses 1 Channel. but that one channel can control multiple attributes such as Red, Green, Blue, Pan, Tilt, etc.. You do not need to patch 1 address to 1 channel as you would on Express.
It may seem as if it's less efficient, but it's better organised and that allows you greater control.

A small LED we have uses CH2 Red, CH3 Green, CH4 Blue - all 0 to 100%. But we have CH1 that is split (as best I can describe it) into zones. I.E. CH1 at 0 = Off, 1-127 = 0-100% Intensity, 128-250 = Strobe, 251-255 100% Intensity.
And normally we would give this one channel. But we would put in #'s from the keyboard to control the attribute within CH1. Would CH1 therefore be a "Multicell"? We have a King Kong 1024 in the other theatre which has an attribute section whereby these channel 'zones' are broken out onto individual faders or wheels. Is this what we are looking at here? It's hard to put into words.

That is a standard Control Channel. Many lights have those. (Although that configuration seems really weird.)

This is a Control Channel interface for a Martin Mac III. It's accessed via the Lamp Controls tab on your console.

That is a standard Control Channel. Many lights have those. (Although that configuration seems really weird.)

This is a Control Channel interface for a Martin Mac III. It's accessed via the Lamp Controls tab on your console.

Hmm! above my pay grade at this time. The Martin Mac III from what I read requires 30 DMX channels for 16b extended. I can't really relate that to your picture. However one puts it a lamp like this with a starting (base) DMC address of say 012 would take up all addresses 012 thru 042. Some of those channels (the 3 extra) would be 'partners' used together with another channel to provide 16bit resolution for smoother operation. Back to the book!