Data transfer via communication ports
770
Part III FP Instructions
F145_WRITE_DATA_
TYPE_OFFS
Write Data to Slave with Type and Offset
To add an enable input and enable output to the instruction, select [With EN/ENO] from the
"Instructions" pane (LD, FBD or IL editor). To reuse an instruction select "Recently used" from the
context menu or press <Ctrl>+<Shift>+<v> in the programming window.
The master data specfied by MasterWordData and by NumberOfWords_ BitsInWords is written
to the slave area specified by SlaveWordAddressType and SlaveAddressOffs.
General programming information for F145 and F146 (see page 766)
PLC types
Availability of F145_WRITE_DATA_TYPE_OFFS (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
ANY16
Address of the remote station (1-99).
MasterWordData ANY The master data which is written to the slave.
SlaveWordAddressType Address type in the slave to which data is written. The offset
must be zero e.g. DT0, WL0...
SlaveWordAddressOffs The offset for the starting slave address whose type is
defined by SlaveWordAddressType and to which the data
is written.
NumberOfWords_
BitsInWords
ANY16
Number of word units to be sent to the master (if the highest
bit is not set) or bits in words (if the highest bit is set). Is
identical to the lower word of s1_ControlData.
Description
Use this instruction to write data from a master to a slave via the serial port (COM1 or COM2) using
MEWTOCOL or Modbus RTU protocol (see communication mode (see page 712)), as defined in
the system register setting
s (see page 1273) of port used. Master and slave must both use the
same protoc
ol. The master must be configured in Master/Slave mode. The slave can be configured
either in Master/Slave mode or in Slave mode only.
Data types
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