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Is it possible to fix frequency reference setting 15Hz or less with the Modbus communication on ATV12 drive.

Yes, it is possible. See below example:
 
Example:
=>In this case, Program LSP [Low Speed] parameter to 15 Hz (or less) on ATV12 drive.
=>If you give run command via Modbus, then drive will run at 15 Hz.
=>And if you give frequency reference below 15 Hz, say 10 Hz via Modbus and run command via Modbus then drive will run at 15 Hz not 10 Hz because LSP [Low Speed] parameter has already programmed to 15 Hz.
=>And if you give frequency reference more than 15 Hz, say 20 Hz via Modbus and run command via Modbus, then drive will run at 20 Hz.
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