Read areas, write areas, and trigger variable areas are defined according to the channel
information created in Step 10. Allocate variables as necessary
.
Update settings for I/O variables
Item Description
Use parent device settings Updates I/O variables according to the parent device settings
Enable 1 (Bus cycle task if not
used by any tasks)
Updates I/O variables in the bus cycle if not used by any other task
Enable 2 (Always use bus
cycle task)
Updates all I/O variables in each cycle of the bus cycle task
This completes the device object settings for the method for sending commands based on slave
initialization and the method for sending commands based on channel settings.
The following is an example of creating an LD program that sends commands when a trigger is
set as an "application
" in channel settings.
The ModbusChannel function block is used for command transmission. The slave device added
to the navigator pane is specified in the slave operand, and the index of the channel that has
been added to the "Modbus Slave Channel" tab and that is used to send commands is specified
in the iChannelIndex command.
13.3 MODBUS
WUME-GM1RTXOP-01 13-37
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