Data transfer via communication ports
775
Part
III F
P
Instructions
F146_READ_DATA_
TYPE_OFFS
Read Data from Slave with Type and Offset
The data is read from the memory area of the slave specified by
SlaveAddressType
and
SlaveAddressOffs
. It is stored in the area of the master specified by
MasterWordAddress
.
General programming information for F145 and F146 (see page 766)
PLC types
Availability of
F146_READ_DATA_TYPE_OFFS
(see page
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).
SlaveWordAddressType
Address type in the slave from which data is read.
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 read by the master (if the
highest bit is not set) or bits in word (if the highest bit is set).
Is identical to the lower word of
s1_ControlData
.
MasterWordData
ANY
The master data which is written to the slave.
Description
Use this instruction to request data from 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 settings (see page 1273) of port used. Master and slave must both use the
same protocol. 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
Содержание FP Series
Страница 27: ...Chapter 1 Basics ...
Страница 60: ...Chapter 2 Data transfer instructions ...
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Страница 449: ...Arithmetic instructions 448 Part III FP Instructions LD ST IF DF start THEN F85_NEG negotiate_value END_IF ...
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Страница 786: ...Chapter 23 Data transfer via network ...
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