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4
MODBUS STANDARD FUNCTIONS
4.3.8 Write multiple registers (FC: 16)
4 - 14
Writes values to multiple holding registers.
(1) Request message format (Master → Slave)
1: The number of points specified as the write points must be matched with the
number of bytes.
(2) Response message format (Slave → Master)
(When completed normally)
Function code
Function code
Head holding register number
(10
)
(The value same as in the
H
request message is stored.)
(When completed with an error)
Function code
Function code
Exception
(90
)
H
2: When completed with an error, the exception code and error code are stored
into the buffer memory.
Refer to Section 11.3 for the storage location, confirmation method and
more details.
Number of accessible devices with one message
Data
(H)
(L)
Data
code*2
1 to 123 points
Write points
(The value same as in the
request message is stored.)
(H)
(L)
MELSEC-Q
4 - 14
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