Siemens SITRANS FC410, Руководство по эксплуатации, Страница: 79 / 160

Functions
7.9 Changing Modbus communication settings
FC410 with Modbus
Operating Instructions, 02/2016, A5E33120874-AC
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7.9 Changing Modbus communication settings
Changing communication parameters, for example Baud Rate, Modbus Parity Framing or
Bus Address effects the Modbus communication as follows:
● The new settings have effect only after a reset, either by restarting the device or writing
the value 1 to Modbus address 600 Restart communication.
● The new settings will not have effect until the Modbus driver has responded to any
ongoing Modbus request.
NOTICE
Setting addresses in a multidrop network
It is recommended NOT to use the default address in a multi-drop network. When
setting device addresses, make sure that each device has a unique address.
Replication of addresses may cause abnormal behavior of the entire serial bus and
make the master unable to communicate with all slaves on the bus.
7.10 Float transmission
The Float Byte Order function ensures that the master and slave use the same sequence of
the bytes when transmitting float values. This enables the user to configure the FC410 using
the configuration tool, SIMATIC PDM, and operate the device with all types of PLCs without
reprogramming the PLC. The transmission order is configured by setting the parameter Byte
Order in the submenu Device → Communication.
Note
The command Restart Communication must be executed to activate the new byte order
setting.