What does 383 on the end of the part number indicate?

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What does 383 on the end of the ATV71 part number indicate?

Issue:
Part number ending in 383

Product Line:
Altivar71

Environment:
ALL

Cause:
Special Firmware Requirement for Altivar 71

Resolution:
This was a special firmware version for use with Permanent Magnet Motors.
Current drives ATV600, ATV900, ATV320, ATV340 all have PM Motor parameters by default.