Mitsubishi Electric FR-D720S SC EC Instruction Manual page 383

Parameter
● 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
Slave
Address
(8 bits)
Normal response (Response message)
Slave
Address
(8 bits)
Message
Slave Address
Function
Tab. 6-74: Description of the query message
Message
Starting Address
No. of Points
Tab. 6-75: Description of normal response
Example
To read the successful register starting address and successful count from the slave
address 25 (H19).
Query message
Slave
Address
H19
(8 bits)
Normal response (Response message)
Slave
Address
H19
(8 bits)
Success of two registers at starting address 41007 (Pr. 7) is returned.
FR-D700 SC EC
Function CRC Check
H46 L
(8 bits) (8 bits)
Function Starting Address
H46 H
(8 bits) (8 bits) (8 bits)
Description
Set the address to which the message will be sent. Broadcast communica-
tion cannot be made (0 is invalid)
Set H46.
Description
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.
The number of holding registers that succeeded in access is returned.
Function CRC Check
H46 H8B
(8 bits) (8 bits)
Function Starting Address
H10 H03
(8 bits) (8 bits) (8 bits)
Communication operation and settings
H
(8 bits)
No. of Points
L H
(8 bits) (8 bits)
HD2
(8 bits)
No. of Points
HEE H00
(8 bits) (8 bits)
CRC Check
L L
(8 bits) (8 bits)
CRC Check
H02 H22
(8 bits) (8 bits)
H
H61
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