Mitsubishi Electric GT16 User Manual page 1280

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.

Disconnecting some of multiple connected
equipment
The GOT can disconnect some of multiple connected
equipment by setting GOT internal device. For
example, the faulty station where a communication
timeout error occurs can be disconnected from
connected equipment. For details of GOT internal
device setting, 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.
Setting example for project script
63 - 8
63. MODBUS(R)/RTU CONNECTION
63.6 Precautions

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.