Special Functions
3, Single coil write [COLW]
COLW K1 K500 M1
X0
K2
D1· D2· S1· S2·
4, Multi-coil write [MCLW]
MCLW K1 K500 K3 M1
X0
K2
D1· S1· S2·D2· D3·
z Write single coil instruction, Modbus function code is 05H
Function: Write the assigned coil status to PLC’s assigned bureau’s assigned coil.
Far away communication bureau number . Operands: K、TD、CD、D、FD
Far away communication bureau number . Operands: K、TD、CD、D、FD
Local receive coil’s start ID. Operands: X、Y、M、S、T、C
Port number. Bound: K1~K2
D1·
D2·
S1·
S2·
Instruction description: when X0 is ON, execute COLW or MCLW instruction. After finish
executing the instruction, set communication finish bit. No operation when X0 is OFF. If
communication errors, resend automatically. If reach 10 times, set communication error flag. User can
check the relative register to judge the reason.
z Write multi-coil instruction, Modbus function code is 0FH。
number. Operands: K、TD、CD、D、FD
number. Operands: K、TD、CD、D、FD
Function: Write the assigned multi-coil status to PLC’s assigned bureau’s assigned coil.
Far away communication bureau
Far away communication bureau
D1·
D2·
Coil number. Operands: K、TD、CD、D、FD
Local receive coil’s start ID. Operands: X、Y、M、S、T、C
Port number. Bound: K1~K2
D3·
S1·
S2·
8
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