Mitsubishi FX3U Series User Manual page 96

FX Series Programmable Controllers
3U
User's Manual - MODBUS Serial Communication Edition
The following tables provide the values for MODBUS address allocation for Bit devices and word devices for
the example stated above:
Bit device:
Coils (Read / Write)
0x0000 - 0x001F
0x0020 - 0x005F
Word device:
Holding-Register (Read / Write)
0x0000 - 0x0007
0x0008 - 0x0009
0x000A - 0x00D9
0x00DA - 0x01D9
0x01DA - 0x01E9
*1. CN200 - CN207 are 32bit counters.
The following table provides an example of an invalid user defined device allocation.
Device
Allocation
Data set
1 D8470(4bit)
2 D8472(4bit)
3 D8474(4bit)
4 D8476(4bit)
5 D8478(4bit)
6 D8480(4bit)
7 D8482(4bit)
8 D8484(4bit)
92
X0 - X37
M128 - M191
TS0 - TS127
CS128 - CS159
D1000 - D1207
R0 - R255
CN200 - CN207
Block size / Number
Device Code
5H(X) D8470(12bit)
0H(M) D8472(12bit)
8H(TS) D8474(12bit)
→
D8476(12bit)
9H(CS) 0
→
D8478(12bit) 13
CH(D) 0
→
DH(R) 0 D8480(12bit) 16
→
FH(CN) 0 D8482(12bit) 16
0 D8484(12bit)
9.4 User defined MODBUS Device Address Assignment
FX Device
3U
FX Device
3U
*1
PLC Head Device
of Devices Address
2 D8471
4 D8473
8 D8475
→
D8477
2 0
→
D8479
0
→
0 D8481
→
0 D8483
0 D8485
9 Slave Specification
PLC Mapping
Coil 0-31
0
→
X0-X37
Coil 32-95
128
→
M128-M191
H-Register 0-7
0
→
TS0-TS127
NOT MAPPED!
CS240-CS271
exceeds the valid
→
240 0
range for CS. Error has
occurred so the
assignment is stopped.
NOT MAPPED!
→
1000 0
Skipped due to error.
NOT MAPPED!
→
0 0
Skipped due to error.
NOT MAPPED!
→
200 0
Skipped due to error.
0 Unused