WAGO 750 Series Manual page 81

Example:
MODBUS bit number 19 => bit addressing in PLC <Wordno>.<Bitno> = 1.2
The PLC functionality of the PFC can also access the data as Bytes and
Double- Words.
The byte addresses are computed according to the following formula:
The double word address is computed according to the following formula:
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
High-Byte Address = Word address*2
Low-Byte Address = (Word address*2) + 1
Double word address = High word address/2 (rounded off)
or = Low word address/2
Fieldbus Controller 750-841
Data Exchange
• 77