compact: The process data can be represented with 16 bits (compact) or with 32 bits.
Optional PDOs
Optional PDOs, in addition to the main PDO:
PDO 1 (0x1A03 or 0x1A02): The frequency or the period can be selected as optional PDO 1
PDO 2 (0x1A05 or 0x1A04): In one of the DC modes a 32 bit or 64 bit timestamp can be selected. The timestamp specifies the time of the last registered increment edge, based on the DistributedClocks system.