Siemens PM330 Hardware Installation Manual page 68

Service and maintenance
5.2 Forming
Code to encrypt the date of manufacture
The date of manufacture is encrypted in positions 3 - 6 of the serial number.
Figure 5-2
In this example, the date of manufacture is April 21, 2013
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Code to encrypt the date of manufacture
Hardware Installation Manual, 12/2018, A5E32844552B AF
Power Module PM330