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4
MODBUS STANDARD FUNCTIONS
Function code
Number of
Function code
response
(14
)
H
data bytes
(m 2+N 2)
4 - 16
(2) Response message format (Slave → Master)
(When completed normally)
Reference
Number of
number
read bytes
(06
)
(n1 2+1)
H
Number of
read bytes
(nm 2+1)
(Number of response data bytes m
"N" in the above diagram represents the total (n1 +
data.
(When completed with an error)
Function code
Function code
Exception code*
(94
)
H
: 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.
Data
Sub-request 1
Device data
1
(H)
(L)
(Number of read bytes n1
(Number of response data bytes m
Sub-request m
Reference
Device data
1
number
(06
)
H
(H)
(Number of read bytes nm
2 + N
Data
Device data
n1
(H)
(L)
2 + 1)
2 + N
2)
Data
(L)
(H)
2 + 1)
2)
+ nm) of the device
MELSEC-Q
Device data
nm
(L)
4 - 16
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