Delta CT2000 Series, User Manual

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Chapter 16 PLC Function

CT2000 Series
16-68
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 P9-31 = -12) before using
this command, and the corresponding communications speed and format must
also be set (set P09-01 and P09-04). 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
H10 Write single word
 After executing this command, M1077, M1078 and M1079 will be immediately
changed to 0.
 As an example, when CT2000 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.
Example
MODRW command
S1 S2 S3 S4 n
Node
ID
Function
code
Addres
s
Register
Leng
th:
1
Reads 4 sets of data comprising the
converter slave device parameters
P01-00 to P01-03, 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
Reads 3 sets of data comprising the
converter slave device parameters
P05-00 to P05-03, 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