Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 658

 Example) Write 60 Hz (H1770) to 40014 (running frequency RAM) of slave address 5 (H05).
Query message
Slave address Function
H05 H06
(8 bits) (8 bits)
Normal response (Response message)
The same data as those in the query message
NOTE
• With broadcast communication, no response is generated even if a query is executed, so when the next query is made, it must
be made after waiting for the inverter data processing time after the previous query is executed.
 Diagnostics (diagnosis of functions) (H08 or 08)
• A communication check can be made since the query message is sent and the query message is returned as it is as the
return message (subfunction code H00 function). Subfunction code H00 (Return query data)
• Query message
a. Slave address b. Function
H08
(8 bits)
(8 bits)
• Normal response (Response message)
a. Slave address b. Function
H08
(8 bits)
(8 bits)
• Query message setting
Message
a Slave address
b Function
c Subfunction
d Data
• Content of normal response
The contents in the normal response (a to d, including the CRC check) are the same as those in the query messages.
NOTE
• With broadcast communication, no response is generated even if a query is executed, so when the next query is made, it must
be made after waiting for the inverter data processing time after the previous query is executed.
 Preset multiple registers (writing data to multiple holding registers) (H10
or 16)
• Data can be written to multiple holding registers.
• Query message
a. Slave
b. Function
address Starting address
H10 H
(8 bits)
(8 bits) (8 bits)
• Normal response (Response message)
a. Slave address b. Function
H10
(8 bits)
(8 bits)
Register address
H00 H0D
(8 bits) (8 bits)
c. Subfunction
H00 H00
(8 bits) (8 bits)
c. Subfunction
H00 H00
(8 bits) (8 bits)
Set the address to send messages to. Broadcast communication is not possible. (Invalid when "0" is
set.)
Set H08.
Set H0000.
Any 2-byte long data can be set. The setting range is H0000 to HFFFF.
c. d.
No. of registers
L H L
(8 bits)
(8 bits) (8 bits) (8 bits)
c. Starting address
H L
(8 bits) (8 bits)
Preset data
H17 H70
(8 bits) (8 bits)
d. Data
H L
(8 bits) (8 bits)
d. Data
H L
(8 bits) (8 bits)
Description
e. Byte count f. Data
H L
(8 bits) (8 bits)
d. No. of registers
H L
(8 bits) (8 bits)
5.15 (N) Communication operation parameters
CRC check
H17 H99
(8 bits) (8 bits)
CRC check
L H
(8 bits) (8 bits)
CRC check
L H
(8 bits) (8 bits)
CRC check
...
L H
(n × 2 × 8
(8 bits) (8 bits)
bits)
CRC check
L H
(8 bits) (8 bits)
5. PARAMETERS
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