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