Data transfer via communication ports
768
Part III FP Instructions
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
MEWT
OCOL-COM Master/Slave or
Modbus RTU Master/Slave.
the COM port selected requires a
communication cassette that has not
been installed.
If the slave data is not available in the user area of the
master, please use either the instruction
F145_WRITE_DATA_TYPE_OFFS (see page 769) or the
F145F
146_MODBUS
_COMMAND (see page 777).
For another station num
ber outside the range (0-99) or
another start register as available in the table of modbus
commands (see page 777), please use the modbus function
blocks of the Modbus Librar
y for FPWIN Pro
(NCL-MODBUS-LIB).
Error flags
Example
In this example the function has been programmed in ladder diagram (LD) and structured text (ST).
GVL
In the global variable list you define variables that can be accessed by all POUs in the project.
POU header
All input and output variables used for programming this function have been declared in the POU
header.
Body
The system variable sys_bPulse1s is copied to bBool1. If bWrite1 and
sys_bIsComPort1F145F146NotActive are set to TRUE, bBool1 is written to the output Y38 of
slave 2.
LD
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