Mitsubishi Electric FR-A700 Series, Техническое руководство, Страница: 432 / 550

466
PARAMETER
z Read Holding Register Access Log (H46 or 70)
A response can be made to a query made by
the function code H03, 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 setting
•Description of normal response
1) Slave Address 2) Function CRC Check
(8bit)
H46
(8bit)
L
(8bit)
H
(8bit)
1) Slave Address 2) Function 3) Starting Address 4) No. of Points CRC Check
(8bit)
H46
(8bit)
H
(8bit)
L
(8bit)
H
(8bit)
L
(8bit)
L
(8bit)
H
(8bit)
Message Setting Description
1) Slave address
Set the address to which a message will be sent. Broadcast communication
cannot be made (0 is invalid).
2) Function Set H46.
Message Setting Description
3) 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.
4) No. of Points The number of holding registers that succeeded in access is returned.
Example: To read the successful register starting address and successful count from the slave address 25 (H19).
Query message
Normal response (Response message)
Success of two registers at starting address 41007 [ Pr. 7 ] is returned.
Slave Address Function CRC Check
H19
(8bit)
H46
(8bit)
H8B
(8bit)
HD2
(8bit)
Slave Address Function Starting Address No. of Points CRC Check
H19
(8bit)
H10
(8bit)
H03
(8bit)
HEE
(8bit)
H00
(8bit)
H02
(8bit)
H22
(8bit)
H61
(8bit)