Mitsubishi FR-A800

(N) Operation via communication and its settings
PARAMETERS
587
5
GROUP
N
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 communication are returned.
"0" is returned for both the number and start address for queries other than the function codes.
• Query message
• Normal response (Response message)
• Query message setting
• Content of normal response
a. Slave
Address
b.
Function
CRC Check
(8 bits)
H46
(8 bits)
L
(8 bits)
H
(8 bits)
a. Slave
Address
b.
Function
c. Starting
Address
d. 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
a Slave Address
Set the address to send messages to. Broadcast communication is not possible.
(Invalid when "0" is set.)
b Function Set H46.
Message Description
c Starting Address
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.
d No. of Points The number of holding registers that were successfully accessed is returned.
Example) Read the successful register start address and number of successful accesses from slave address 25 (H19).
Query message
Normal response (Response message)
Two successful reads of start address 41007 (Pr.7) are returned.
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)