Modbus Extended File Register Assignment To The Programmable Controller Cpu File Register - Mitsubishi Electric QJ71MB91 User Manual

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PARAMETER SETTING
7.3.2 MODBUS extended file register assignment to the programmable
controller CPU file register
The MODBUS extended file register assignment to the programmable controller CPU is
fixed to the file register (ZR).
It is assigned to the file register (ZR) of the programmable controller CPU as shown below.
ZR4179999
ZR4180000
ZR4184063
(1) Out-of-range read/write request
(2) MODBUS extended file register size
Remark
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- 23 7.3 MODBUS Device Assignment Parameter

7.3.2 MODBUS extended file register assignment to the programmable controller CPU file register

Programmable controller
CPU file register (ZR)
ZR0
ZR9999
ZR10000
ZR19999
ZR20000
ZR29999
ZR30000
Figure 7.9 Extended file register assignment
The QJ71MB91 sends an exception response if the master requests it to read from or
write to a nonexistent file register (ZR) of the programmable controller CPU on the
station where the QJ71MB91 is mounted.
The MODBUS extended file register size is dependant on the file register (ZR) size
set to the programmable controller CPU on the QJ71MB91-mounted station.
POINT
Even if the slave (QJ71MB91) receives Write File Record (FC:21) when the
programmable controller CPU's file register (ZR) is read-only (for example, when
stored on a Flash card), it will issue a normal response.
In this case, however, the action for Write File Record is not performed.
To write to the extended file register, check that the programmable controller
CPU's file register (ZR) is writable or not in advance.
For the programmable controller CPU's file register (ZR), refer to the following
manual:
User's Manual (Function Explanation, Program Fundamentals) for the CPU
module used
MODBUS
extended file register
600000
10000 File number 0
609999
600000
10000 File number 1
609999
600000
10000 File number 2
609999
600000
4064 File number 418
604063