User`s manual

90
FX3U Series Programmable Controllers
User’s Manual - MODBUS Serial Communication Edition
9 Slave Specification
9.4 User defined MODBUS Device Address Assignment
9.4.2 Example of user defined device allocation
The following table provides an example of a valid user defined device allocation.
The example program below shows the defined MODBUS defined device allocation for the table on the
previous page.
Device
Allocation
Data set
Device Codec
Block Size / Number of
Devices
d
PLC Head Device
Address
e
PLC Mapping
1 D8470(4bit) 5H(X) D8470(12bit) 2 D8471 0
Coil 0-31
→ X0-X37
2 D8472(4bit) 0H(M) D8472(12bit) 4 D8473 128
Coil 32-95
→ M128-M191
3 D8474(4bit) 8H(TS) D8474(12bit) 8 D8475 0
H-Register 0-7
→ TS0-TS127
4 D8476(4bit) 9H(CS) D8476(12bit) 2 D8477 128
H-Register 8-9
→ CS128-CS159
5 D8478(4bit) CH(D) D8478(12bit) 13 D8479 1000
H-Register 10-217
→ D1000-D1207
6 D8480(4bit) DH(R) D8480(12bit) 16 D8481 0
H-Register 218-473
→ R0-R255
7 D8482(4bit) FH(CN) D8482(12bit) 8 D8483 200
H-Register 474-489
→ CN200-CN207
8 D8484(4bit) 0 D8484(12bit) 0 D8485 0 Unused