Station Number Setting - Mitsubishi Electric GOT2000 Series Connection Manual

5.5.2

Station number setting

In the MODBUS network, a maximum of 31 MODBUS
RTU equipment can be connected to one GOT.
Assign a non-overlapped station number ranging from 1 to
247 arbitrarily to each MODBUS
In the system configuration, the MODBUS
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.
Station
GOT
No.3
Examples of station number setting
(1) Direct specification
When setting the device, specify the station number of
®
the MODBUS /RTU equipment of which data is to be
changed.
Specification range
1 to 247
(2) Indirect specification
When setting the device, indirectly specify the station
®
number of the MODBUS
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 equipment.
Specification Compatible
station NO. device
248 GD10
0 to 255:
249 GD11
0 : All station specification (broadcast)
250 GD12
255 : Host station access
251 GD13
For the setting other than the above,
252 GD14
an error (dedicated device is out of
253 GD15
range) will occur.
254 GD16
(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.
®
/
®
/RTU equipment.
®
/RTU
Station Station
No.15 No.1
/RTU equipment of which
Setting range
5. MODBUS(R)/RTU CONNECTION
5.5 MODBUS(R)/RTU Equipment Side Setting
5
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