Analogue Inputs

If you have a basic module with 4 analog inputs, 2 of the total of 8 possible analogue inputs are reserved by default.
There is a settings page in LSC.

File > Propertie s> Offline Settings > I/O settings

There you set in groups of two, how many of the 8 possible analog inputs are reserved for the base module.

0 AI released in the base module:
Then the two channels are on the first analog expansion module AI1 and AI2.
2AI released in the base module:
Then AI1 (I7) and AI2 (I8) for the base module and the two channels on the first analog extension module AI3 and AI4.
2AI released in the base module:
Then AI1 (I7), AI2 (I8), AI3 (I1) and AI4 (I2) for the base module and the two channels on the first analog extension module AI5 and AI6.