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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
16 External FX Device – FNC 80 to FNC 89
16.1 FNC 80 – RS / Serial Communication
16.1 FNC 80 – RS / Serial Communication
Outline
This instruction sends and receives data using non-protocol communication by way of a serial port (only ch1) in
accordance with RS-232C or RS-485 provided in the main unit.
1. Instruction format
2. Set data
3. Applicable devices
S: This function is supported only in FX3G/FX3GC/FX3U/FX3UC PLCs.
Explanation of function and operation
1. 16-bit operation (RS)
This instruction sends and receives data in non-protocol communication by way of serial ports in accordance with
RS-232C or RS-485 provided in the main unit.
→ For detailed explanation, refer to the Data Communication Edition manual.
Operand type Description Data type
Head device of data registers storing data to be sent
16-bit binary or
character string
m Number of bytes of data to be sent [setting range: 0 to 4096] 16-bit binary
Head device of data registers storing received data when receiving is completed
16-bit binary or
character string
n Number of bytes to be received [setting range: 0 to 4096] 16-bit binary
Oper-
and
Type
Bit Devices Word Devices Others
System User Digit Specification System User
Special
Unit
Index
Con-
stant
Real
Number
Charac-
ter String
Pointer
XYMTCSD
.b KnX KnY KnM KnS T C D R
U\G
V Z Modify K H E "
"P
S
m S
S
n S
FNC 80
RS
−
Mnemonic Operation Condition
16-bit Instruction
9 steps RS
Mnemonic Operation Condition
Continuous
Operation
32-bit Instruction
S
1
S
D
S
1
S
S
2
D
FNC 80
RS
mS
Command
input
D
n