Mitsubishi Electric FR-A820-00046 Instruction Manual page 866

(N) Operation via communication and its settings
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.
● Query message
³ Slave address
(8 bits)
● Normal response (Response message)
³ Slave address
(8 bits)
● Query message setting
Message
³ Slave address
· Function
Tab. 5-295: Description of the query message
● Content of normal response
Message
» Starting address
¿ No. of points
Tab. 5-296: Description of normal response
Example Read the successful register start address and number of successful accesses from slave address 25
(H19).
Query message
Slave address
H19
(8 bits)
Normal response (Response message)
Slave address
H19
(8 bits)
Two successful reads of start address 41007 (Pr. 7) are returned.
5 - 664
· Function
CRC check
H46 L
(8 bits) (8 bits)
· Function » Starting address
H46 H
(8 bits) (8 bits)
Description
Set the address to send messages to. Broadcast communication is not possible.
(Invalid when "0" is set.)
Set H46.
Description
The start address of the holding register that was successfully accessed is returned.
Start address = start register address (decimal) – 40001
For example, when start address 0001 is returned, the holding register address that was
successfully accessed is 40002.
The number of holding registers that were successfully accessed is returned.
Function CRC check
H46 H8B HD2
(8 bits) (8 bits) (8 bits)
Function Starting address
H10 H03 HEE
(8 bits) (8 bits) (8 bits)
H
(8 bits)
¿ No. of points
L H
(8 bits) (8 bits)
No. of points
H00 H02
(8 bits) (8 bits)
Parameters
CRC check
L L
(8 bits) (8 bits) (8 bits)
CRC check
H22 H61
(8 bits) (8 bits)
H