Precautions - Mitsubishi Electric GOT2000 Series Connection Manual

5.6 Precautions


Reading the holding registers (GT27, GT25,
GT23 only)
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.

Read Coils (GT21 only)
The GOT reads the Coil (000001) for
checking whether the GOT can communicate with the
controller.
Therefore, if the equipment does not have Coil
(000001), normal communication may not be
performed.

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.
5.4.1 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 (GOT2000) Help
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5. MODBUS(R)/RTU CONNECTION

5.6 Precautions


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.
®
/RTU
®
/RTU
Setting example for project script