Modbus/Rtu Slave Equipment Side Setting - Mitsubishi Electric GOT2000 Series Connection Manual

5.5

MODBUS/RTU Slave Equipment Side Setting

5.5.1 Station number setting
In the MODBUS network, a maximum of 31 MODBUS/RTU slave equipment can be connected to one GOT.
Assign a non-overlapped station number ranging from 1 to 247 arbitrarily to each MODBUS/RTU slave equipment.
In the system configuration, the MODBUS/RTU slave equipment with the station number set with the host address must be
included.
The station number can be set without regard to the cable connection order. There is no problem even if station numbers
are not consecutive.
■1. Direct specification
When setting the device, specify the station number of the MODBUS/RTU slave equipment of which data is to be
changed.
■2. Indirect specification
When setting the device, indirectly specify the station number of the MODBUS/RTU slave equipment of which data is to
be changed using the 16-bit GOT internal data register (GD10 to GD16).
When specifying the station No. from 248 to 254 on GT Designer3, the value of GD10 to GD16 compatible to the
station No. specification will be the station No. of the MODBUS/RTU slave equipment.
Specification station NO.
248
249
250
251
252
253
254
■3. All station specification (broadcast)
Target station differs depending on write-in operation or read-out operation.
• For write-in operation, all station will be a target.
• For read-out operation, only the host station will be a target.
POINT POINT POINT
MODBUS/RTU Slave equipment
For details of the MODBUS/RTU Slave equipment, refer to the manual of MODBUS/RTU Slave
equipment to be used.
Station
GOT
No.3
Examples of station number setting
Compatible device
GD10
GD11
0 to 255:
GD12
0 : All station specification (broadcast)
GD13 255 : Host station access
For the setting other than the above, an error (dedicated device is out of range) will
GD14
occur.
GD15
GD16
Station Station
No.15 No.1
Specification range
1 to 247
Setting range
5.5 MODBUS/RTU Slave Equipment Side Setting
5
5 - 15