32.1 INTRODUCTION
The basic purpose of an HMI is to allow easy graphical interface with a process.
These devices have been known by a number of names,
These allow an operator to use simple displays to determine machine condition and make simple settings.
These devices allow certain advantages such as,
The general implementation steps are,
To control the HMI from a PLC the user inputs set bits in the PLC memory, and other bits in the PLC memory can be set to turn on/off items on the HMI screen.
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