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4
MODBUS STANDARD FUNCTIONS
4.3.7 Write multiple coils (FC: 15)
4 - 12
Writes values (ON/OFF) to multiple coils.
(1) Request message format (Master → Slave)
: The number of points specified as the write points must be matched with the
number of bits specified as the number of bytes.
For example, when the write points are 16, set the number of bytes to 2 bytes
(= 16 bits).
(2) Response message format (Slave → Master)
(When completed normally)
Function code
Function code
Head coil number
(0F
)
(The value same as in the head
H
coil number in the request
message is stored.)
(H)
Number of accessible devices with one message
Data
Write points
(The value same as in the
write points in the request
message is stored.)
(L)
(H)
MELSEC-Q
1 to 1968 points
(L)
4 - 12
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