The 1XH20-7AA0 is the AA0 I/O variant of the 1XH 0.75 kW FSA — paired with the AF0 variant (1XH20-7AF0) in this batch. The AA0/AF0/AB0 suffix system is the one constant across every G115D catalog code family: 0XA0x, 0XA2x, 0XA6x, 1XE, 1XB, and 1XH all use the same three-character suffixes to denote I/O control level variants. The prefix determines the functional configuration; the suffix determines the I/O variant within that configuration. The power rating (0.75 kW) is constant across all of them.

Why does suffix invariance matter across code families?

An engineer who knows that AA0 means a specific I/O configuration on a 0XA60 drive can apply that same knowledge to a 1XH20 drive — the suffix means the same thing. The G115D part number is a three-axis matrix: prefix (functional/catalog system) × power code × suffix (I/O variant). Once the engineer understands the matrix, any G115D part number is self-documenting. The TIA Portal project, PROFINET telegram, and commissioning macro are identical regardless of which cell in the matrix the drive was ordered from. This is platform engineering applied to part numbering — the catalog code differs, the drive on the wall is the same G115D.