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PLC/Modbus RTU dual mode
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PHOENIX CONTACT
8
PLC/Modbus RTU dual mode
Activate the PLC/Modbus RTU dual mode using the PSI-CONF software (from Section 5.6,
“Configuration via PSI-CONF software” onwards).
In PLC/Modbus RTU dual mode, you can read the I/O values of the extension modules
connected to the wireless slave modules via the Modbus RTU protocol (I/O to serial). In
addition, serial Modbus devices can be connected over the wireless network. The master
wireless module provides an RS-232 or RS-485 interface to a Modbus RTU master.
In PLC/Modbus RTU dual mode, all the wireless modules work as Modbus slaves and have
unique Modbus slave addresses. The Modbus ID of each wireless module is set using the
yellow thumbwheel.
You can connect I/O extension modules to each wireless device in the network. A wireless
station can have a maximum of 32 extension modules. Use the white thumbwheel to set the
I/O-MAP addresses.
Figure 8-1
PLC/Modbus RTU dual mode
PLC/Modbus RTU dual mode is available for firmware version 1.80 or later. You can
update the firmware free of charge using the PSI-CONF software, Version 2.33 or later.