Mitsubishi Electric FR-A800 Series Instruction Manual page 691

 Function code list
Function name
Read holding register
Preset single register
Diagnostics
Preset multiple
registers
Read holding register
access log
 Read holding register (reading data of holding registers) (H03 or 03)
• Query message
a. Slave address
(8 bits)
• Normal response (Response message)
a. Slave address
(8 bits)
• Query message setting
Message
a Slave address
b Function
c Starting address
d No. of points
• Content of normal response
Message
e Byte count
f Data
690
5. PARAMETERS
5.15 (N) Communication operation parameters
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Read/
Code
write
The data of the holding registers is read.
The various data of the inverter can be read from MODBUS
registers.
System environmental variable (Refer to
Read H03
Real time monitor (Refer to
Fault history (Refer to
Product profile (Refer to
Inverter parameters (Refer to
Data is written to a holding register.
Data can be written to MODBUS registers to output instructions
Write H06 to the inverter or set parameters.
System environmental variable (Refer to
Inverter parameters (Refer to
Functions are diagnosed. (communication check only)
A communication check can be made since the query message
Read H08 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).
Data is written to multiple consecutive holding registers.
Data can be written to consecutive multiple MODBUS registers to
Write H10 output instructions to the inverter or set parameters.
System environmental variable (Refer to
Inverter parameters (Refer to
The number of registers that were successfully accessed by the
previous communication is read.
Queries by function codes H03 and H10 are supported.
Read H46 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 function code H03 and H10.
b. Function c. Starting address
H03 H
(8 bits) (8 bits)
b. Function e. Byte count
H03
(8 bits)
(8 bits)
Set the address to send messages to. Broadcast communication is not possible. (Invalid when "0"
is set.)
Set H03.
Set the holding register address from which to start reading the data.
Starting address = start register address (decimal) - 40001
For example, when starting register address 0001 is set, the data of holding register address 40002
is read.
Set the number of holding registers for reading data. Data can be read from up to 125 registers.
The setting range is H02 to HFA (2 to 250).
Twice the number of reads specified by (d) is set.
The amount of data specified by (d) is set. Read data is output Hi bytes first followed by Lo bytes,
and is arranged as follows: data of start address, data of start address+1, data of start address+2,
and so forth.
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d. No. of points
L H
(8 bits) (8 bits)
f. Data
H L ...
(8 bits) (8 bits) (n × 16 bits)
Description
Description
Broadcast
communication
Not available
Available
Not available
Available
Not available
CRC check
L L H
(8 bits) (8 bits) (8 bits)
CRC check
L H
(8 bits) (8 bits)
Message
format
reference
page
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