PLCs for CNC machine tools are generally divided into two categories:
Built-in Type PLC (or integrated, built-in). Stand-alone Type PLC (or general purpose)
6, position control module
The position control module is an important part of the feed servo system and is an interface module for connecting the CNC device to the servo drive system when the trajectory control is implemented.
Commonly used position control modules are:
Open loop position control module: interface between CNC device and stepper motor drive power; closed loop (including semi-closed loop) position control module: interface between CNC device and DC and AC servo drive.
7, function interface module
An interface board that implements user-specific functional requirements, examples:
Profile controller interface; laser processing focus tracker interface; signal collector interface board in tool monitoring system.
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