8.4 MODBUS RTU Master Communication (SEND)
8-13
8.4.3 SEND Instruction (MODBUS Function Code Unspecified Type)
Instruction format
Operand
Items
Settings
Setting range
i
Specify the operation unit.
US / SS
S
Specify the header of the source node data area.
(Note 1)
n
Specify the No. of sent data.
1 - 127 words, 1 - 2040 bits (Note 2)
D1
Specify the partner station no.
H0 - HF7 (0 - 247) (Note 3)
D2
Specify the initial address of the receiver node data area
in the partner node.
H0 - HFFFF (0 - 65535)
(Note 4)
D3
Specify the device area in the source node to save the
execution result code (one word).
(Note 5)
(Note 1) Types of devices and transmission methods to be specified for operands [S] and [D2], and MODBUS
function codes to be used for instruction execution vary.
Types of device
to be specified in [S]
Transmission
method
MODBUS function codes
to be used for instruction execution
16 bit device
WX, WY, WR, WL, DT, LD
Register transmission
Force Multiple Coils (15)
Preset Multiple Registers (16)
1 bit device
X, Y, R, L, DT, n, LD, n
Bit transmission
Force Multiple Coils (15)
(Note 2) The No. of sent data [n] is on a word basis for register transmission, and on a bit basis for bit transmission.
(Note 3) When "0" is specified for partner station no., global transmission is applied. In this case, no response
message is received from the partner side.
(Note 4) 16 bit device WX, WL, and LD; and 1 bit device X; L; DT, n; and LD, n cannot be specified for the header of
the receiver data in the partner node.
(Note 5): Device that can be specified for [D3] are: WX, WY, WR, WL, DT, LD. Saved as one word in the specified area.
0: Normal completion
1: Communication port is being used for master communication
2: Communication port is being used for slave communication
3: No. of master communication instructions that can be used simultaneously has been exceeded
4: Sending timeout
5: Response reception timeout
6: Received data error
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