Panasonic FP7 Series User Manual page 129

Types of device to be
specified for [S]
16-Bit device:
WX, WY, WR, WL, DT, LD
1-Bit device:
X, Y, R, L, DT.n, LD.n
● The amount of sent data [n] is specified in words for the register transfer, and in bits for the
bit transfer.
● Operand [D1] is specified as a combination of a two-digit hexadecimal MODBUS function
code and a two-digit hexadecimal partner station number.
Example: Specify "H100A" in the case of MODBUS function code 16 (preset multiple
registers) and station number 10.
● In the case of SCU, when "0" is specified for the partner station number, global transfer is
selected. In this case, there is no response message from the destination.
■
Execution result code [D3]
Code Description
H0 Normal end
The communication port is being used in the
H1
master communication.
The communication port is being used in the
H2
slave communication.
The number of master communication
H3 instructions simultaneously used is
exceeded.
H4 Transmission timeout
H5 Response reception timeout
(Note 1) It occurs when an abnormal telegram is received. When there is a format error in the header of an
individual protocol, the communication discards the received data and a response reception timeout
occurs.
(Note 2) It occurs when the communication control I/O relays corresponding to the communication port (master
communication clear to send flag, master communication send active flag, master communication
send done result relay)are not allocated as I/O words of the CPU unit in the I/O map. It occurs only
when the number of user connections of ET-LAN is expanded and this instruction is executed
specifying the expanded connections.
■
Sample program (in the case of SCU)
● This program sends the command from the COM1 port of the CPU unit, and then writes the
content of PLC's data registers DT100 to DT101 into the data areas 400001 to 400002 of the
external device (station number 1).
● This program checks that the master mode is on (XC) and that sending is not in progress in
the same port (YC), and then starts up the SEND instruction.
WUME-FP7COM-07
8.4 MODBUS RTU Master Communication (SEND)
Transfer Number of sent
method data [n]
1
Register
transfer
2 to 127
1
Bit
transfer
2 to 2040
Code
H8001
H8002
H8003
Value that can be specified for high bytes
of [D1]
H6: Preset single register (06)
HF: Force multiple coils (15)
H10: Preset multiple registers (16)
HF: Force multiple coils (15)
H10: Preset multiple registers (16)
H5: Force single coil (05)
HF: Force multiple coils (15)
HF: Force multiple coils (15)
Description
H6 (Note 1)
Reception error
H7
I/O allocation shortage error
Function code error
Device number error (out of range)
Device quantity error (out of range)
(Note 2)
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