LG GLOFA-GM Series User Manual page 240

Chapter 7 Communication function
[Table 7.32] describes data memory mapping between MODBUS and GLOFA Cnet.
[Table 7.32] MODBUS communication driver supported function code
MODICON controller address
Name
[Note 1]
(0)Read Coil Status
(1)Read Input Status
(4)Read Holding Reg
(3)Read Input Reg
(0)Force Single Coil
(4)Preset Single Reg
(4)Presel Multi Reg
Remark
[Note 1] Figures in ( ) of each item are reference values of MODICON Controller.
[Note 2] For reading of Coil Status & Input Status, the address shall be set in a multiple of 8.
(Ex.) 8, 16, 32, 8000
3, 5, 27, 9991
[Note 3] All addresses of MODICON Controller are mapped in %MX / %MW areas of GLOFA-PLC causing
repeated area.
(pay attention to setting)
(Ex.) Read Holding Reg 100
[Note 4] Since start address of MODICON Controller is '1', access to GLOFA PLC '0' address is unavailable,
however, access to addresses staring from 1 is available. As for Word areas, max.4999 addresses only
are accessible.(10 kbytes)
Address
mapping
Address
[Note 2]
8 ~ 9992
8 ~ 9992
1 ~ 4999
1 ~ 4999
1 ~ 9999
1 ~ 4999
1 ~ 4999
OK
ERROR
%MW100 = Read Input Reg 100
7-121
GLOFA-PLC Address
Device Address
[Note 3] [Note4]
%MX 8 ~ 9992
%MX 8 ~ 9992
%MW 1 ~ 4999
%MW 1 ~ 4999
%MX 1 ~ 9999
%MW 1 ~ 4999
%MW 1 ~ 4999
%MW100 (same area)
Remark
Bit Read
Bit Read
Word Read
Word Read
Bit Write
Word Write
Word Write