Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 976 / 1218

Ethernet communication (FR-A800-E) Parameters
5 - 774
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.
●
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
– Failed completion
Header Subheader Destination
network No.
Destination
station No.
Destination
unit I/O No. Destination
multidrop
station No.
Request data
length
Monitoring
timer
Request data Footer
Header Subheader Destination
network No.
Destination
station No.
Destination
unit I/O No. Destination
multidrop
station No.
Response data
length
End code Request data Footer
Header Subheader Destination
network No.
Destination
station No.
Destination
unit I/O No. Destination
multidrop
station No.
Response data
length
End code
... (to be continued next row)
... (continued)
Network No.
(responding
station)
Station No.
(responding
station)
Destination
unit I/O No. Destination
multidrop
station No.
Command Subcommand Footer
<----------------------------------------------------------------------------------------------------------------->
Error information
Item Size Endian Description
Header — —
Header for TCP/IP or UDP/IP. The header is added by the external
device before transmission.
Subheader
(QnA-compatible 3E
frame)
2 bytes
Big
Request: H5000
Response: HD000
Subheader
(QnA-compatible 4E
frame)
6 bytes
Request: H5400 + Serial No. + H0000
Response: HD400 + Serial No. + H0000
Destination network
No.
1 byte —
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)
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.
Destination station No. 1 byte —
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)
Destination unit I/O No. 2 bytes Little Fixed to H03FF
Destination multidrop
station No.
1 byte — Fixed to H00
Request data length 2 bytes Little
Specify the data length from the monitoring timer to the request data
in hexadecimal.
Example:
24 bytes: H1800
Tab. 5-357: Description of request and response message items (1)