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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
30 External Device Communication – FNC270 to FNC276
30.7 FNC276 - MODBUS Read/Write Instruction
21
FNC160-FNC169
Real Time Clock
Control
22
FNC170-FNC179
External Device
23
FNC180
Alternate
Instructions
24
FNC181-FNC189
Others
25
FNC190-FNC199
Block Data
Operation
26
FNC200-FNC209
Character String
Control
27
FNC210-FNC219
Data
Operation 3
28
FNC220-FNC249
Data
Comparison
29
FNC250-FNC269
Data Table
Operation
30
FNC270-FNC276
Ex-Device
8H
Diagnosis
(Available only
in FX
3U and
FX
3UC PLCs.)
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
FX
3UC 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
FX
3UC PLCs.)
0 (fixed) 0 (fixed)
PLC Destination Device (head address)
: Programming State
+1: Event Counter
+2: Bus Message Counter
+3: Log Length
+4~35: Up to 64 Bytes Event Log
Applicable Devices D•R
Block Length 4~36 Point
FH
Write Multiple
Coils
MODBUS Address:
0000H~FFFFH
Device Count:1~1968
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
10H
Write Multiple
Registers
MODBUS Address:
0000H~FFFFH
Device Count:1~123
PLC Source Device (head address)
Applicable Devices
D•R•K•H
(D•R can be indexed.)
Block Length
/
S
1
S
2
S
3
S
4
D
D
D
D
D
D
D
D
S
3
S
3