Conventionally, Human Machine Interface (HMI) units are installed by means of Panel-Mount, which
is insert the unit into a cutout in a control cabinet from the front, and then secure the unit by attaching
mounting brackets from the rear. In this way, the front bezel of the unit remains visible from the front,
and the advantage is that installation, maintenance, and eventually replacement are easy. As the
cutouts are gradually being standardized, brand factor becomes of little significance in selecting
replacement HMI. For example, The 192 x 138mm cutout that Weintek adopted for 5.7" HMI in 1995
is still in use among popular 7" HMI nowadays, including Weintek’s models : MT8070iH, MT8070iE,
and eMT3070A. The 192 x 138mm cutout has become the de-facto standard cutout dimension for 7"
HMI, as most leading HMI manufacturers are releasing new products conforming to this standard.