Q: I don't know the text display.. Man-machine interface.. Touch screen. The specific role and distinction of these three. What is the text display specifically used?
A: Text Display, Operator Panel, and Touch Panel are all human-machine interfaces (hmi).
The text display is relatively simple and inexpensive. Generally, only a few lines of characters and the like can be displayed, and the parameters are input using a simple keyboard. Due to the small display range of the screen, it is necessary to perform cumbersome operations when finding the required parameters.
The principle of the operation panel is similar to that of the text display, but its screen display is large, and there are many buttons on the panel. Generally, there are function keys, numeric keys, direction keys, etc., so the operation steps are simplified when searching and inputting parameters.
The touch screen puts the OP button on the screen, and the screen switching and parameter input are all operated on the screen, so the screen can be made very intuitive, the screen distribution is completely freely controlled by the programmer, and the programming freedom is great.
Q: I don't know if the text display can be changed to program programming? Is plc's handheld programmer a text display?
A: The text display can't be used for programming, because its selling point is low price, and there is no too advanced function.
It is only used to display and modify the data of some registers in the PLC.
The handheld programmer is not a text display. Text displays are required to be configured before they can be used.
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