Below you will find brief information for Programmable Controller FX3U Series, Special Adapter FX3U 232ADP-MB, Special Adapter FX3U 485ADP-MB. The FX3U series Programmable Controllers offer a reliable and robust solution for industrial automation applications. These controllers feature a powerful CPU with a wide range of built-in functions and support various communication protocols, including MODBUS. The Special Adapters FX3U 232ADP-MB and FX3U 485ADP-MB allow you to connect your FX3U PLC to a MODBUS network.
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MODBUS Master and Slave functionality
Supports up to 16 slaves on RS-485
Supports one-to-one communication on RS-232C
Transmission speed up to 19.2 kbps
RTU and ASCII communication modes
Dedicated PLC command for MODBUS communication
The FX3U-232ADP-MB supports RS-232C communication, with a transmission speed of 300, 600, 1200, 2400, 4800, 9600, or 19200 bps. It supports 7-bit or 8-bit data length, 1-bit or 2-bit stop bit, and RTU or ASCII communication protocol. The transmission distance is up to 15m (49'2')
One FX3U MODBUS Master can control up to 16 slaves.
When using both Channel 1 and Channel 2 at the same time, one can be used for MODBUS communication, while the other can be used for other communication types, but not both for MODBUS.
Is it necessary to write a program to convert registers or I/O point addresses to Modbus addresses for an FX3U controller?
No manual real-time conversion logic is required. The system provides a default mapping table where PLC I/O and registers automatically correspond to specific Modbus addresses. For master communication, specify the Modbus address in the ADPRW instruction. For custom mapping, use one initialization program to write configuration values to registers D8470–D8485.