Modbus Device Assignment Parameters - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

MODBUS device assignment parameters

The MODBUS device assignment parameters are used to associate the MODBUS devices with the device memory areas of
the CPU module. This enables direct access from a MODBUS/TCP master device to the device memory areas of the CPU
module.
The following shows the setting image of the MODBUS device assignment parameters.
CPU module device memory
Internal relay (M)
M0
M1201
M4700
M8191
Output (Y)
Y0
Y1FFF
Latch relay (L)
L0
L4
L8191
Special register (SD)
SD0
SD2047
Data register (D)
D0
D999
D6000
D12287
1 FUNCTIONS
110
1.7 Communications Using MODBUS/TCP
3500
8192
5
2048
1000
6288
MODBUS device
Coil
000001
3500
003500
004000
8192
012191
5
065000
065004
065536
Holding register
400001
1000
401000
402000
2048
404047
430000
6288
436287
465536
MODBUS device assignment
parameter setting example
Coil assignment 1
Device code
M(0090H)
Head device number 1201
Head coil number
0
Assignment points
3500
Coil assignment 2
Device code
Y(009DH)
Head device number
0
Head coil number 3999
Assignment points
8192
Coil assignment 3
Device code
L(0092H)
Head device number
0
Head coil number 64999
Assignment points
5
Holding register assignment 1
Device code
SD(00A9H)
Head device number
0
Head holding register number 1999
Assignment points
2048
Holding register assignment 2
Device code
D(00A8H)
Head device number 0
Head holding register number 0
Assignment points
1000
Holding register assignment 3
Device code
D(00A8H)
Head device number
6000
Head holding register number 29999
Assignment points
6288