Mitsubishi QJ71MB91, User Manual

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10
- 7 10.2 Z(P).MBRW
10
DEDICATED INSTRUCTIONS
(a) Type specification of the target MODBUS device
The table below shows the possible combinations in the target MODBUS device
type specification ((S1)+8) and the valid ranges of the access points.
Any other combinations are not applicable to the Type specification of the target
MODBUS device type ((S1)+8).
* 1 Read File Record (FC: 20) and Write File Record (FC: 21) allows access to multiple areas in one
transmission, however, only one area is accessible in one transmission when using this dedicated
instruction.
* 2 In the case of broadcast, only 0001
H
(Write multiple coils), 0005
H
(Write multiple registers) and
0007
H
(Write file record) can be set.
* 3 Simultaneous execution of read and write with a single instruction is allowed only for 0505
H
(Read/
Write multiple registers).
Table10.6 Possible combinations of target MODBUS device type specification
Target MODBUS device type specification
Function code
Valid access point range
Setting
value
Read target Write target Read points Write points
0100
H
Coil
No specification
01 Read coils
1 to 2000
points
-
0200
H
Input 02 Read discrete inputs
1 to 2000
points
-
0400
H
Input register 04 Read input registers
1 to 125
points
-
0500
H
Holding register 03 Read holding registers
1 to 125
points
-
0700
H
Extended file register
*1
20 Read file record
1 to 124
points
-
0001
H
*2
No specification
Coil 15 Write multiple coils -
1 to 1968
points
0005
H
*2
Holding register 16 Write multiple registers -
1 to 123
points
0007
H
*2
Extended file register
*1
21 Write file record -
1 to 122
points
0505
H
*3
Holding register Holding register 23 Read/Write multiple registers
1 to 125
points
1 to 121
points