Filter
Top Products
15 Applied Instructions (External Device (optional device))
15.8 RS2 / Serial Communication 2
411
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
11
Applied Instructions
(Data Operation)
12
Applied Instructions
(High Speed
Processing)
13
Applied Instructions
(Handy
Instruction)
14
Applied Instructions
(External FX I/O
Device)
15
Applied Instructions
(External Device
(optional device))
16
Applied Instructions
(External Device)
17
Applied Instructions
(Data Transfer 2)
18
Applied Instructions
(Floating Point)
19
Applied Instructions
(Data Operation 2)
20
Applied Instructions
(Positioning
Control)
15.8 RS2 / Serial Communication 2
Outline
This instruction transmits and receives data by no-procedure communication via serial port of RS-232C or
RS-485 installed in the basic unit.
In the case of FX
3G and FX3GC PLCs, data can be transmitted and received by no-procedure communication
also via standard built-in port (RS-422).
1. Format and operation, execution form
2. Set data
*1. Rounding up below the decimal point
*2. Ch0 is applicable to FX
3G and FX3GC PLCs only.
In the case of FX
3S and FX3G (14-point and 24-point type) PLCs, ch2 cannot be used.
3. Applicable devices
S: Refer to "Cautions".
FX3U(C) FX3G(C) FX3S FX2N(C) FX1N(C) FX1S FXU/FX2C FX0N FX0(S)
Instruction
name
Operation
Execution
form
Expression in each language
Structured ladder/FBD ST
RS2 16 bits Continuous RS2(EN, s, m, n, n1, d);
Variable Description Data type
Input
variable
EN Execution condition Bit
Head device in which transmission data is stored
• 16-bit processing mode: m÷2 points
*1
occupied
ANY16
Number of transmission data bytes [Setting range: 0 to 4096] ANY16
Number of reception data bytes [Setting range: 0 to 4096] ANY16
Used channel number [Setting content: K0: ch0, K1: ch1, K2: ch2]
*2
ANY16
Output
variable
ENO Execution state Bit
Head device for storing reception data upon completion of reception
• 16-bit processing mode: n÷2 points
*1
occupied
ANY16
Operand
type
Bit Devices Word Devices Others
System User Digit designation
System
User
Special
Unit
Index
Cons
tant
Real
Number
Character
String
Pointer
XYMTCS
D
.b
KnX KnY
Kn
M
KnS T C D R
U\G
VZModifierK H E
""
P
z
S1
z
z
S1 zz
z S1 zz
zz
z
S1 z
RS2
EN
s
ENO
m
n
n1
d