434
FX
3U
/FX
3UC
Series Programmable Controllers
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 in no-protocol communication by way of a serial port (only the ch1) in
accordance with RS-232C or RS-485 provided in the main unit.
1. Instruction format
2. Set data
*1.
Make sure to observe "m + n
≤
8000."
3. Applicable devices
Explanation of function and operation
1. 16-bit operation (RS)
This instruction sends and receives data in no-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 Communication Control 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]
*1
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]
*1
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
X Y M T C S D
.b KnX KnY KnM KnS
T
C
D
R U
\G
V
Z Modify K
H
E
"
"
P
3 3
3
m
3 3
3 3
3 3
3
n
3 3
3 3
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
m
S
Command
input
D
n