====== Sizes and sections ======
Unipi units are available in three sizes:
  * **Type S**: max. 10 inputs and outputs, 70 × 90 × 60 mm (4 DIN modules)
  * **Type M**: max. 40 inputs and outputs, 140 × 90 × 60 mm (8 DIN modules)
  * **Type L**: max. 70 inputs and outputs, 210 × 90 × 60 mm (12 DIN modules)

Depending on the model, Unipi units feature 1-3 sections, with each section containing a group of inputs, outputs or communication interfaces. Unipi units can have **1** (S-series), **2** (M-series) or **3** (L-series) sections, as shown on the picture below: 

{{ :en:hw:sections-sizes_en.png?direct |}}

Labels **S**, **M** and **L** allow for a quick distinction between unit sizes. The **section numbers** is important for the software, especially for addressing input and output boards. The special section number is **0**, through which in some cases all three sections can be accessed simultaneously.