Data transfer via communication ports
779
Part III FP Instructions
Reference numbers Address area of Panasonic PLCs
From 300001 From WL0
From 302001 From LD0
For reference number and address area ranges supported by the Panasonic PLCs, please refer to the User's
Manual of the PLC. If the reference number is outside the supported range, an error is returned.
PLC types
Availability of F145F146_MODBUS_COMMAND (see page 1321)
Variable Data
type
Function
Port Specifies the slave's COM port (1 or 2) via system variable:
SYS_COM1_PORT
SYS_COM2_PORT
SlaveAddress Address of the remote station (1-99).
FunctionCode* SYS_MODBUS_01_READ_COIL
SYS_MODBUS_02_READ_INPUT
SYS_MODBUS_03_READ_HOLDING_REGISTERS
SYS_MODBUS_04_READ_INPUT_REGISTERS
SYS_MODBUS_05_FORCE_COIL
SYS_MODBUS_06_PRESET_REGISTER
SYS_MODBUS_15_FORCE_COILS
SYS_MODBUS_16_PRESET_REGISTERS
StartRegister Starting address. The address type depends on the command
specified by FunctionCode*.
NumberOfRegisters*
ANY16
Number of transmission bits or words.
MasterData ANY The master data which is written to the slave.
For Relay T/C Register Constant
Port WX WY WR WL - - DT LD FL -
Slave Address WX WY WR WL - - DT LD FL -
Function Code* - - - - - - - - - system
defined
Start Register WX WY WR WL - - DT LD FL -
NumberOf
Registers*
- - - - - - - - - dec. or hex.
Master Data WX WY WR WL - - DT LD FL -
No. IEC address Set If
R9007 %MX0.900.7 permanently
R9008 %MX0.900.8 permanently
port 0 (global transmission) gets no
response from COM1 or COM2.
slave data or master data exceeds the
available address range.
the communication mode (see page 712)
is not set to ME
WTOCOL-C
OM
Master/Slave or Modbus RTU
Master/Slave.
the COM port selected requires a
communication cassette that has not
been installed.
Data types
Operands
Error flags
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