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Chapter 16 PLC Function Applications│CFP2000
API
MODRW
150
Bit device
X
Y
M
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.
After executing this command, M1077, M1078 and M1079 will be immediately
changed to 0.
As an example, when CFP2000 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
Seria
l No.
P
Word device
K
H
KnX KnY KnM
＊
＊
＊
＊
＊
＊
＊
＊
Function
Description
H 02
Input read
H 03
Read word
H 06
Write single word
H 0F
Write multiple coils
H10
Write single word
Example
Reads 4 sets of data comprising the
converter slave device Pr.01-00 to
1
Pr.01-03, and saves the read data in
D0 to D3
Reads 3 sets of data comprising the
converter slave device addresses
2
H2100 to H2102, and saves the read
data in D5 to D7
Reads 3 sets of data comprising the
converter slave device Pr.05-00 to
3
Pr.05-03, and writes the values as D10
to D12
Writes 2 sets of data comprising the
converter slave device addresses
4
H2000 to H2001, and writes the values
as D15 to D16
Modbus data read/write
16-bit command (5 STEP)
T
C
D
MODRW
execution type
＊
＊
32-bit command
＊
－
＊
＊
Flag signal:
S1
Node ID
K10
K10
K10
K10
16-102
Continuous
MODRW
P
execution type
－
－
M1077 M1078 M1079
MODRW command
S2
S3
S4
Function
Address Register
code
H3
H100
D0
H3
H2100
D5
H10
H500
D10
H10
H2000
D15
Pulse
－
n
Length
K4
K3
K3
K2
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