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7
PARAMETER SETTING
7 - 22
(8) Access points (Read setting/Write setting)
(a)
Set the number of points to be written to the MODBUS device and the
number of points to be read from the MODBUS device.
(b)
The access points change depending on the type specification of the target
MODBUS device.
Type Specification of the Target MODBUS Device
Set value
Read target
0100
Coil
H
0200
Input
H
0400
Input register
H
0500
Holding register
H
0001
H
Not specified
0005
H
0505
Holding register
H
POINT
In the access to the bit device (coil/input) of the slave, the fraction bits are handled
as described below.
1)
Bit device read
Type specification of the
target MODBUS device
0200
(Input)
H
<QJ71MT91 buffer memory>
bF
to
1000
H
1001
H
1002
H
Remaining area is
masked with 0.
2)
Bit device write
Type specification of the
target MODBUS device
0001
(Coil)
H
<QJ71MT91 buffer memory>
bF
to
3000
H
Remaining area is
ignored.
Write target
Not specified
Coil
Holding register
Holding register
Automatic communication parameter: Read setting
Head buffer memory
address
1000
H
<Target slave device area>
b0
bF
Read
Automatic communication parameter: Write setting
Head buffer memory
address
3000
H
Write
b0
bF
Access Points Setting Range
Points to be read
1 to 2000 points
1 to 2000 points
1 to 125 points
1 to 125 points
1 to 125 points
Target MODBUS device
head number
16628
116629
to
116663
Target MODBUS device
head number
1305
<Target slave device area>
001306
to
001310
MELSEC-Q
Points to be written
1 to 1968 points
1 to 123 points
1 to 121 points
Access points
35
b0
116640 to 116625
116656 to 116641
116672 to 116657
Access points
5
b0
001312 to 001297
7 - 22
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