Mitsubishi Electric FR-A820-00046 Instruction Manual page 976

Ethernet communication (FR-A800-E)
Message format
● Request message format
The following is the format of a request message sent from the external device to the inverter. The
request message data length is 2047 bytes at the maximum.
Header
● Response message format
The following is the format of a response message sent from the inverter to the external device.
The response message data length is 2048 bytes at the maximum.
– Normal completion
Header
– Failed completion
Header
Item
Header
Subheader
(QnA-compatible 3E
frame)
Subheader
(QnA-compatible 4E
frame)
Destination network
No.
Destination station No.
Destination unit I/O No. 2 bytes
Destination multidrop
station No.
Request data length
Tab. 5-357: Description of request and response message items (1)
5 - 774
Subheader Destination Destination
network No. station No.
Subheader Destination Destination
network No. station No.
Subheader Destination Destination
network No. station No.
Network No.
... (continued) (responding
station)
<----------------------------------------------------------------------------------------------------------------->
Size Endian
— —
2 bytes
Big
6 bytes
1 byte —
1 byte —
Little
1 byte —
2 bytes Little
Destination Destination Request data
unit I/O No. multidrop length
station No.
Destination Destination Response data
unit I/O No. multidrop length
station No.
Destination Destination Response data
unit I/O No. multidrop length
station No.
Station No. Destination Destination
(responding unit I/O No. multidrop
station) station No.
Error information
Description
Header for TCP/IP or UDP/IP. The header is added by the external
device before transmission.
Request: H5000
Response: HD000
Request: H5400 + Serial No.
Response: HD400 + Serial No.
Specify the network No. of the
access destination.
Use a hexadecimal value to specify
the network number.
Own station: H00
Other stations: H01 to HEF (1 to 239)
Specify the station No. of the access
destination.
Use a hexadecimal value to specify
the station number.
Own station:
HFF (when the network No. is H00)
Other stations: H01 to H78 (1 to 120)
Fixed to H03FF
Fixed to H00
Specify the data length from the monitoring timer to the request data
in hexadecimal.
Example:
24 bytes: H1800
Parameters
Monitoring Request data
timer
End code Request data
End code
... (to be continued next row)
Command Subcommand
+ H0000
+ H0000
The own station has a network
No. of H00 and a station No. of
HFF. The other stations have
other values.
The request data addressed to
the own station is received
regardless of the network No.
and station No. settings.
The request data addressed to
the other stations is received
when the Pr.1424 and Pr.1425
settings are the same.
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