Mitsubishi Electric FR-D720S SC EC, Instruction Manual

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Parameter Communication operation and settings
FR-D700 SC EC 6 - 233
●
Read holding register access log (H46 or 70)
A response can be made to a query made by the function code H03 or H10.
The starting address of the holding registers that succeeded in access during previous
communication and the number of successful registers are returned.
In response to the query for other than the above function code, 0 is returned for the address
and number of registers.
Query message
Normal response (Response message)
Query message
Normal response (Response message)
Success of two registers at starting address 41007 (Pr. 7) is returned.
쑶
Slave
Address
Function CRC Check
(8 bits)
H46
(8 bits)
L
(8 bits)
H
(8 bits)
Slave
Address
Function Starting Address No. of Points CRC Check
(8 bits)
H46
(8 bits)
H
(8 bits)
L
(8 bits)
H
(8 bits)
L
(8 bits)
L
(8 bits)
H
(8 bits)
Message Description
Slave Address
Set the address to which the message will be sent. Broadcast communica-
tion cannot be made (0 is invalid)
Function Set H46.
Tab. 6-74: Description of the query message
Message Description
Starting Address
The starting address of the holding registers that succeeded in access is
returned.
Starting address = starting register address (decimal) + 40001
For example, when the starting address 0001 is returned, the address of
the holding register that succeeded in access is 40002.
No. of Points The number of holding registers that succeeded in access is returned.
Tab. 6-75: Description of normal response
Example
쑴
To read the successful register starting address and successful count from the slave
address 25 (H19).
Slave
Address
Function CRC Check
H19
(8 bits)
H46
(8 bits)
H8B
(8 bits)
HD2
(8 bits)
Slave
Address
Function Starting Address No. of Points CRC Check
H19
(8 bits)
H10
(8 bits)
H03
(8 bits)
HEE
(8 bits)
H00
(8 bits)
H02
(8 bits)
H22
(8 bits)
H61
(8 bits)