Mitsubishi Electric 800 Series Instruction Manual page 510

 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
(8 bits) H46
(8 bits)
• Normal response (Response message)
a. Slave Address b. Function
(8 bits) H46
(8 bits)
• Query message setting
Message
a Slave Address
b Function
• Content of normal response
Message
c Starting Address
d No. of Points
 Example) Read the successful register start address and number of successful accesses from
slave address 25 (H19).
Query message
Slave Address Function
H19 H46
(8 bits) (8 bits)
Normal response (Response message)
Slave Address Function
H19 H10
(8 bits) (8 bits)
Two successful reads of start address 41007 (Pr.7) are returned.
CRC Check
L H
(8 bits) (8 bits)
c. Starting Address d. No. of Points
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.
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.
CRC Check
H8B HD2
(8 bits) (8 bits)
Starting Address No. of Points
H03 HEE H00
(8 bits) (8 bits) (8 bits)
CRC Check
L L H
(8 bits) (8 bits) (8 bits)
Description
Description
CRC Check
H02 H22 H61
(8 bits) (8 bits) (8 bits)
5.12 (N) Operation via communication and its settings
3
4
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5
5
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7
8
9
10
509
5. PARAMETERS