Mitsubishi QJ71MB91, User Manual

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7
- 9 7.2 Automatic Communication Parameter
7.2.1 Automatic communication parameter details
7
PARAMETER SETTING
(6) Head buffer memory address (Read/Write setting)
Specify the head address of the buffer memory where the data read from or written to
the slave are stored.
The head buffer memory addresses should not duplicated among Automatic
communication parameters 1 to 32.
(7) Target MODBUS device head number (Read/Write setting)
Specify the head number of the read or write target MODBUS device.
(a) Specifying the head number
As the target MODBUS device head number, set "(Last 5 digits of actual device
number) - 1".
Example: Set "17" for the holding register, 400018.
(b) When specifying a value of 32768 (8000
H
) or more in a sequence program
When specifying a value of 32768 (8000
H
) or more in a sequence program, set
the value in hexadecimal.
(8) Access points (Read/Write setting)
Set the number of points to be written to the MODBUS device and to be read from
the MODBUS device.
The access points vary depending on the type specification of the target MODBUS
device.
Table7.4 Access points
Type specification of the target MODBUS device
Access points setting range
Setting
value
Read target Write target Read points Write points
0100
H
Coil
No specification
1 to 2000 points -
0200
H
Input 1 to 2000 points -
0400
H
Input register 1 to 125 points -
0500
H
Holding register 1 to 125 points -
0001
H
No specification
Coil - 1 to 1968 points
0005
H
Holding register - 1 to 123 points
0505
H
Holding register Holding register 1 to 125 points 1 to 121 points