Mitsubishi Electric FR-A820-00046 Instruction Manual page 995

Parameters
Preset multiple registers (writing data to multiple holding registers) (H10 or 16)
● Data can be written to multiple holding registers.
● Query message
³
Transaction
identifier
H
(8 bits) (8 bits)
● Normal response (Response message)
³
Transaction
identifier
H
(8 bits) (8 bits)
● Query message setting
Message
³ Transaction identifier
· Protocol Identifier
» Length field
¿ Unit identifier
´ Function
² Starting address
¶ No. of points
º Byte count
¾ Data
Tab. 5-374: Description of the query message
● Content of normal response
With a normal response, the content is the same as in ³ to ¶ of the query message.
FR-A800
· »
Protocol Length field
Identifier
L H L H L
(8 bits) (8 bits) (8 bits) (8 bits)
· »
Protocol Length field
Identifier
L H L H L
(8 bits) (8 bits) (8 bits) (8 bits)
Description
The master adds the data for the purpose of transaction control.
The same data is returned in the response from the slave.
Fixed to 0. (When the slave receives data other than 0, it does not send the response
message.)
0 is returned in the response from the slave.
The data length from the unit identifier to the data is stored in byte.
Fixed to 255
Set H10.
Set the holding register address from which to start writing the data.
Starting address = start register address (decimal) - 40001
For example, when start register address 0001 is set, the data of holding register address
40002 is read.
Set the number of holding registers to write to.
Data can be written to up to 125 registers.
The setting range is H02 to HFA (2 to 250).
Set the value set in ¶ multiplied by 2.
The amount of data specified by ¶ is set. Write 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.
¿ ´ ²
Unit Func- Starting
identifier tion address
H10 H L
(8 bits)
(8 bits) (8 bits) (8 bits)
¿ ´ ²
Unit Func- Starting
identifier tion address
H10 H L
(8 bits)
(8 bits) (8 bits) (8 bits)
Ethernet communication (FR-A800-E)
¶ º
No. of points Byte
count
H L H
(8 bits)
(8 bits) (8 bits) (8 bits)
¶
No. of points
H L
(8 bits) (8 bits)
¾
Data
...
L (n × 2
(8 bits) × 8
bits)
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