Mitsubishi Electric QJ71MT91 User Manual page 118

7 PARAMETER SETTING
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(5) Type specification of the target MODBUS device
(a) Set the type of the read/write target MODBUS device.
b15
Read target
Set Value
00
H
01
H
02
H
04
H
05
H
(b) Setting range
The following table gives the combinations of read and write targets
available for the target MODBUS device type setting. Any other
combinations are not available.
Type Specification of the Target MODBUS Device
Set value Read target
0100 Coil
H
0200 Input
H
0400 Input device
H
0500 Holding register
H
0001
H
Not specified (*1)
0005
H
0505 Holding register (*2)
H
* 1: To perform only read or write, set "0" to each of the following:
Head buffer memory address
Target MODBUS device head number
Access points
* 2: Reading and writing can be performed simultaneously with one instruction only when
0505 (Read/write multiple registers) is set.
H
(6) Head buffer memory address (Read setting/Write setting)
(a) As the head buffer memory address, specify the head address of the buffer
memory that will store the data read from or written to the slave.
(b) The head buffer memory address must not be duplicated in the automatic
communication parameters 1 to 64. Set different head buffer memory
addresses to each of the automatic communication parameters.
(7) Target MODBUS device head number (Read setting/Write setting)
(a) As the target MODBUS device head number, specify the head number of
the read or write target MODBUS device.
(b) As the target MODBUS device head number, set "(last 5 digits of actual
device number) - 1".
Example: Set "17" when the head number of the holding register is 400018.
(c) When specifying a value of 32768 (8000
set the value in hexadecimal.
b8 b7
Write target
Target MODBUS Device Type
Not specified
Coil
Input
Input register
Holding register
Write target
Not specified (*1)
Coil
Holding register
Holding register
) or more in a sequence program,
H
MELSEC-Q
b0
Issued Function Code
01 Read coils
02 Read discrete inputs
04 Read input registers
03 Read holding registers
15 Write multiple coils
16 Write multiple registers
23 Read/Write multiple registers
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