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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
*1. This calculation formula is applicable when the applicable device is D or R.
11H
Report Slave ID
(Available only
in FX
3U and
FX
3UC PLCs.)
0 (fixed) 0 (fixed)
PLC Destination Device (head address)
: Slave ID
+1: RUN/STOP State
Applicable Devices D•R
Block Length 2 Point
16H
Mask Write
Register
(Available only
in FX
3U and
FX
3UC PLCs.)
MODBUS Address:
0000H~FFFFH
AND Mask:
0000H~FFFFH
OR Mask: 0000H~FFFFH
Applicable Devices
D•R•K•H
(D•R can be indexed.)
Block Length 1 Point
17H
Read/Write
Multiple
Registers
(Available only
in FX
3U and
FX
3UC PLCs.)
MODBUS Address:
: Write Address
0000H~FFFFH
+1: Read
Address
0000H~FFFFH
Device Count:
: Write Count
1~121
+1: Read Count
1~125
PLC Destination Device
(head address)
: Write Data 1
+1: Write Data 2
+ (Write Count ) -1: Write
Data ( )
+ : Read Data 1
+ +1: Read Data 2
+ + (Read Count +1) -1:
Read Data ( +1)
Applicable Devices D•R
Block Length
Write Count +
Read Count +1
/
S
1
S
2
S
3
S
4
D
D
D
S
2
S
2
S
3
S
3
S
4
S
4
S
4
S
3
S
3
S
4
S
3
S
4
S
3
S
4
S
3
S
3
S
3
S
3
S
3