Delta MH300 Series - Page 955

Chapter 16 PLC Function ApplicationsMH300
16-92
API
MODRW
Modbus data read / write
150
P
Bit device
Word device
16-bit command (5 STEP)
MODRW
Continuous
execution type
MODRW
P
Pulse
execution type
32-bit command
－
－
－
－
Flag signal: M1077 M1078 M1079
X
Y
M
K
H
KnX
KnY
KnM
T
C
D
S1
*
*
*
S2
*
*
*
S3
*
*
*
S
*
n
*
*
*
 S1: online device address. S2: communications function code. S3: address of data
to read / write. S: register for data to be read/written is stored. N: length of data to
be read / written.
 COM1 must be defined as controlled by the PLC (set Pr.09-31 = -
12) before using
this command, and the corresponding communications speed and format must
also be set (set Pr.09-01 and Pr.09-
04). S2: communications function code.
Currently only supports the following function code; the remaining function code
cannot be executed.
Function
Description
H 02
Input read
H 03
Read word
H 06
Write single word
H 0F
Write multiple coils
H 10
Write single word
 After executing this command, M1077, M1078 and M1079 will be immediately
changed to 0.
 As an example, when MH300 must control another converter and PLC, if the
converter has a station number of 10 and the PLC has a station number of 20,
see the following example:
Control slave device converter
Serial
No.
Example
MODRW command
S1 S2 S3 S4 n
Node ID
Function
code
Address
Register
Length
1
Reads 4 sets of data comprising
the converter slave device
parameters Pr.01-00 to Pr.01-03,
and saves the read data in D0 to
D3
K10 H3 H100 D0 K4
2
Reads 3 sets of data comprising
the converter slave device
addresses H2100 to H2102, and
saves the read data in D5 to D7
K10 H3 H2100 D5 K3
3
Writes 3 sets of data comprising
the converter slave device
parameters Pr.05-00 to Pr.05-03,
and writes the values as D10 to
D12
K10 H10 H500 D10 K3
4
Writes 2 sets of data comprising
the converter slave device
addresses H2000 to H2001, and
writes the values as D15 to D16
K10 H10 H2000 D15 K2