Mitsubishi Electric 800 Series Instruction Manual page 47

SERIAL number example of the FR-A8NP
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8 3
Symbol Year Month Control number
SERIAL
The SERIAL consists of one symbol, two characters
indicating the production year and month, and three
characters indicating the control number.
The last digit of the production year is indicated as the
Year, and the Month is indicated by 1 to 9, X
(October), Y (November), or Z (December).
46
PPO TYPE SUPPORT SPECIFICATION