User manual

IEC61131 User and Reference Manual
April 22, 2008
588
DF1 Addressing
DF1 addressing is used by the MSTR ladder logic function when the specified port is
configured for one of the DF1 protocols. Modbus addressing must be used in all other ladder
logic program functions.
DF1 addressing is used by function master_message when the specified port is configured
for one of the DF1 protocols. The functions dbase, setdbase, setABConfiguration and
getABConfiguration also support DF1 addressing.
All DF1 addresses are absolute word addresses beginning with the first 16-bit register in the
I/O database at address 0.