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30 Applied Instructions (External Device Communication)
30.7 ADPRW / MODBUS Read/Write
726
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
8H
Diagnosis
(Available only in FX3U
and FX3UC PLCs)
Sub-function: 3H
Change ASCII Input
Delimiter
Sub-function Data (ASCII
Mode End of Message
Character): 00H to FFH
(Slave response: echo of )
Applicable Devices D, R
Block Length 1 Point
Sub-function: 4H
Force Listen Only Mode
0 (fixed)
0 (fixed)
Applicable Devices D, R
Block Length 0
Sub-function: AH
Clear Counter and
Diagnostic Register
0 (fixed)
(Slave response: echo of )
Applicable Devices D, R
Block Length 1 Point
Sub-function: BH
Return Bus Message
Counter
0 (fixed)
PLC Destination Device (head address)
Applicable Devices D, R
Block Length 1 Point
Sub-function: CH
Return Bus
Communication Error
Counter
0 (fixed)
PLC Destination Device (head address)
Applicable Devices D, R
Block Length 1 Point
Sub-function: DH
Return Bus Exception
Error Counter
0 (fixed)
PLC Destination Device (head address)
Applicable Devices D, R
Block Length 1 Point
Sub-function: EH
Return Slave
Message Counter
0 (fixed)
PLC Destination Device (head address)
Applicable Devices D, R
Block Length 1 Point
Sub-function: FH
Return Slave No
Response Counter
0 (fixed)
PLC Destination Device (head address)
Applicable Devices D, R
Block Length 1 Point
Sub-function: 10H
Return NAK Counter
0 (fixed)
PLC Destination Device (head address)
Applicable Devices D, R
Block Length 1 Point
Sub-function: 11H
Return Slave Busy
Counter
0 (fixed)
PLC Destination Device (head address)
Applicable Devices D, R
Block Length 1 Point
Sub-function: 12H
Return Character
Overrun Counter
0 (fixed)
PLC Destination Device (head address)
Applicable Devices D, R
Block Length 1 Point
BH
Get Comm.
Event Counter
(Available only in FX
3U
and FX3UC PLCs)
0 (fixed) 0 (fixed)
PLC Destination Device (head address)
• : Programming State
• +1: Event Counter
Applicable Devices D, R
Block Length 2 Point
CH
Get Comm.
Event Log
(Available only in FX
3U
and FX3UC PLCs)
0 (fixed) 0 (fixed)
PLC Destination Device (head address)
• : Programming State
• +1: Event Counter
• +2: Bus Message Counter
• +3: Log Length
• +4 to 35: Up to 64 Bytes Event Log
Applicable Devices D, R
Block Length 4 to 36 Point
FH
Write Multiple Coils
MODBUS Address:
0000H to FFFFH
Device Count: 1 to 1968
PLC Source Device (head address)
Applicable Devices
D, R, K, H, M, X, Y, S
(D, R, M, X, Y, S can be
indexed.)
Block Length
(+15) ÷16
*1
*1. This calculation formula is applicable when the applicable device is D or R.