Modbus/Tcp; Outline; Initial Setting For Modbus/Tcp - Mitsubishi Electric 800 Series Instruction Manual

2.7

MODBUS/TCP

2.7.1

Outline

The MODBUS/TCP protocol allows transmission of MODBUS messages via Ethernet communication.
 Communication specifications
The communication specifications are shown in the following table.
Item
Communication protocol
Conforming standard
Time delay setting
Maximum number of connections
Number of simultaneously
Slave function (server)
acceptable request messages
2.7.2

Initial setting for MODBUS/TCP

Use the following parameters to perform required settings for Ethernet communication between the inverter and other devices.
To make communication between other devices and the inverter, perform the initial settings of the inverter parameters to match
the communication specifications of the devices. Data communication cannot be made if the initial settings are not made or if
there is any setting error.
Pr. Name
1427
Ethernet function selection
*1
1
N630
1428
Ethernet function selection
*1
2
N631
1429
Ethernet function selection
*1
3
N632
1430
Ethernet function selection
*1
4
N633
1432 Ethernet communication
N644 check time interval
1449
Ethernet command source
*1
selection IP address 1
N670
1450
Ethernet command source
*1
selection IP address 2
N671
1451
Ethernet command source
*1
selection IP address 3
N672
1452
Ethernet command source
*1
selection IP address 4
N673
Ethernet command source
1453
selection IP address 3 range
*1
N674
specification
Ethernet command source
1454
selection IP address 4 range
*1
N675
specification
*1 The setting is applied after an inverter reset or next power-ON.
*2 The setting is available for the FR-E800-EPA.
*3 The setting is available for the FR-E800-EPB.
MODBUS/TCP protocol
OPEN MODBUS/TCP SPECIFICATION
Not available
3
1 to 3
Initial
Setting range
value
5001
502, 5000 to 5002,
5006 to 5008, 5010 to
45237
*3
5013, 9999, 34962
*2
44818 , 45237,
45238
*2
45238, 47808 ,
61450
9999
0
1.5 s
0.1 to 999.8 s
9999
0
0
0 to 255
0
0
9999
0 to 255, 9999
9999
Description
Description
,
Set the application, protocol, etc.
Ethernet communication is available, but the inverter output
is shut off in the NET operation mode.
Set the interval of the communication check (signal loss
detection) time for all devices with IP addresses in the range
specified for Ethernet command source selection (Pr.1449
to Pr.1454).
If a no-communication state persists for longer than the
permissible time, the inverter output will be shut off.
No communication check (signal loss detection)
To limit the network devices that send the operation or
speed command through the Ethernet network, set the
range of IP addresses of the devices.
When Pr.1449 to Pr.1452 = "0 (initial value)", no IP address
is specified for command source selection via Ethernet. In
this case, operation commands cannot be sent via Ethernet.
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2. Ethernet Communication
2.7 MODBUS/TCP
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