Mitsubishi Electric FR-A820-00046 (0.4K), Инструкция по эксплуатации

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Ethernet communication (FR-A800-E) Parameters
5 - 792
Diagnostics (diagnosis of functions) (H08 or 08)
●
A communication check can be made since the query message is sent and the query message is
returned as it is as the return message (subfunction code H00 function).
Subfunction code H00 (Return query data)
●
Query message
●
Normal response (Response message)
●
Query message setting
●
Content of normal response
With a normal response, the content is the same as in
to
!
of the query message.
Transaction
identifier Protocol
Identifier
Length field
Unit
identifier
Function
Subfunction
!
Data
H
(8 bits)
L
(8 bits)
H
(8 bits)
L
(8 bits)
H
(8 bits)
L
(8 bits)
(8 bits)
H08
(8 bits)
H00
(8 bits)
H00
(8 bits)
H
(8 bits)
L
(8 bits)
Transaction
identifier Protocol
Identifier
Length field
Unit
identifier
Function
Subfunction
!
Data
H
(8 bits)
L
(8 bits)
H
(8 bits)
L
(8 bits)
H
(8 bits)
L
(8 bits)
(8 bits)
H08
(8 bits)
H00
(8 bits)
H00
(8 bits)
H
(8 bits)
L
(8 bits)
Message Description
Transaction identifier
The master adds the data for the purpose of transaction control.
The same data is returned in the response from the slave.
Protocol Identifier
Fixed to 0. (When the slave receives data other than 0, it does not send the response
message.)
0 is returned in the response from the slave.
Length field The data length from the unit identifier to the data is stored in byte.
Unit identifier Fixed to 255
Function Set H08.
Subfunction Set H0000.
!
Data Any data 2 bytes long can be set. Setting range is H0000 to HFFFF.
Tab. 5-373: Description of the query message