Modbus Extended File Register Assignment - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

MODBUS devices
The following table lists the MODBUS devices supported by the RJ71EN71 and RnENCPU (network part).
MODBUS device type Unit
Coil Bit
Input Bit
Input register Word
Holding register Word
Extended file register Word
*1 For the CPU module, read-only memory cannot be set in the file register.
*2 The maximum values of the number of access points and the file number for the extended file register depend on the size of the file
register (ZR) set in the CPU module. ( Page 111 MODBUS extended file register assignment)
*3 The number of access points for the extended file register is the maximum size that can be set in the CPU module (when the R120CPU
+ NZ2MC-16MBS are mounted).

MODBUS extended file register assignment

The assignment of the MODBUS extended file register to the CPU module is fixed to the file register (ZR).
The following shows the assignment to the file register of the CPU module. (The number of points for the file register shows
the maximum size that can be set in the CPU module (when the R120CPU + NZ2MC-16MBS are mounted)).
CPU module
file register (ZR)
ZR0
ZR9999
ZR10000
ZR19999
ZR20000
ZR29999
ZR30000
ZR10019999
ZR10020000
ZR10027007
■Size of the MODBUS extended file register
The size of the MODBUS extended file register depends on the size of the file register (ZR) set in the CPU module.
For details, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
Read/write Number of access
points
Read/write 65536 points
Read 65536 points
Read 65536 points
Read/write 65536 points
*1
Read/write 10027008 points
MODBUS
extended file register
10000 File number 0
10000 File number 1
10000 File number 2
7008 File number 1002
MODBUS device No.
1 to 65536
100001 to 165536
300001 to 365536
400001 to 465536
*2*3
File number: 0 to 1002
Device number: 600000 to 609999
600000
609999
600000
609999
600000
609999
600000
607007
1.7 Communications Using MODBUS/TCP
1
1 FUNCTIONS
111