Mitsubishi Electric FR-A820-00046 Instruction Manual page 996

Ethernet communication (FR-A800-E)
Example Write 0.5 s (H05) to 41007 (Pr. 7) and 1 s (H0A) to 41008 (Pr. 8) of slave address 25 (H19).
Query message
Transaction
identifier
A given value is set.
Normal response (Response message)
Transaction
identifier
The values are the same as those in the query message.
Read holding register access log (H46 or 70)
● Queries by function codes H03 and H10 are supported.
The number and start address of holding registers successfully accessed by the previous commu-
nication are returned.
"0" is returned for both the number and start address for queries other than the function codes
above.
● Query message
³
Transaction
identifier
H
(8 bits)
● Normal response (Response message)
³
Transaction
identifier
H
(8 bits)
● Query message setting
Message
³ Transaction identifier
· Protocol Identifier
» Length field
¿ Unit identifier
´ Function
Tab. 5-375: Description of the query message
5 - 794
Protocol
Length field
Identifier
H00 H00 H00 H0B
(8 bits) (8 bits) (8 bits) (8 bits)
Protocol
Length field
Identifier
H00 H00 H00 H06
(8 bits) (8 bits) (8 bits) (8 bits)
·
Protocol Length field
Identifier
L H L
(8 bits) (8 bits) (8 bits) (8 bits)
·
Protocol Length field
Identifier
L H L
(8 bits) (8 bits) (8 bits) (8 bits)
Description
The master adds the data for the purpose of transaction control.
The same data is returned in the response from the slave.
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.
The data length from the unit identifier to the data is stored in byte.
Fixed to 255
Set H46.
Unit
Func- Starting
iden-
tion address
tifier
H19 H10 H03 HEE
(8 bits) (8 bits) (8 bits) (8 bits)
Unit
Func- Starting
iden-
tion address
tifier
H19 H10 H03 HEE
(8 bits) (8 bits) (8 bits) (8 bits)
» ¿
Unit identifier
H L
(8 bits)
(8 bits)
» ¿
Unit identifier
H L
(8 bits)
(8 bits)
Byte
No. of points
count
H00 H02 H04 H00 H05
(8 bits) (8 bits) (8 bits) (8 bits) (8 bits)
No. of points
H00 H02
(8 bits) (8 bits)
´
Func-
tion
H46
(8 bits)
´ ²
Func- Starting
tion address
H46 H L
(8 bits) (8 bits) (8 bits)
Parameters
Data
H00 H0A
(8 bits) (8 bits)
¶
No. of points
H L
(8 bits) (8 bits)