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63. MODBUS(R)/RTU CONNECTION
63.6 Precautions
63.6 Precautions

Station No. settings of the MODBUS equipment side
In the system configuration, the MODBUS equipment with the station number set with the host address must be
included. For details of host address setting, refer to the following.
63.4.1 Setting communication interface (Communication settings)

GOT clock control
The settings of "time adjusting" or "time broadcast" made on the GOT will be disabled on the PLC.

Cutting the portion of multiple connection of the controller
By setting GOT internal device, GOT can cut the portion of multiple connection of the controller. For example, the
faulty station where a communication timeout error occurs can be disconnected from connected equipment. For
details of the setting contents of GOT internal device, refer to the following manual.
GT Designer3 Version1 Screen Design Manual

MODBUS communication control function on the GS device
At GOT startup, set MODBUS communication control function with project scripts, etc. If settings are changed after
communication start, a communication error may occur.

Reading holding registers
The GOT reads the holding registers (400001) for checking whether the GOT can communicate with the controller.
Therefore, if the equipment does not have holding registers (400001), normal communication may not be performed.