Read Holding Register Access Log (H46 Or 70) - Mitsubishi Electric 800 Series Instruction Manual

4.5.10

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
a. Slave Address b. Function
H46
(8 bits)
(8 bits)
• Normal response (Response message)
a. Slave Address b. Function
H46
(8 bits)
(8 bits)
• Query message setting
Message
a Slave Address
b Function
• Content of normal response
Message
c Starting Address
d No. of Points
74
PARAMETER
CRC Check
L H
(8 bits) (8 bits)
c. Starting Address
H L H
(8 bits) (8 bits) (8 bits)
Set the address to send messages to. Broadcast communication is not possible.
(Invalid when "0" is set.)
Set H46.
The start address of the holding register that was successfully accessed is returned.
Starting address = [Start address (decimal) of the holding registers successfully
accessed] - 40001
For example, when starting address 0001 is returned, the start address of the holding
registers successfully accessed is 40002.
The number of holding registers that were successfully accessed is returned.
d. No. of Points CRC Check
L L
(8 bits) (8 bits)
Description
Description
H
(8 bits)