Mitsubishi Electric MELSEC FX Series - 7.9.8 RS2

7 Applied Instructions
7.9 External Device (optional device)
423
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
1
Outline
2
Instruction List
3
Configuration of Instruction
4
How to Read Explanation of Instructions
5
Basic Instruction
6
Step Ladder Instructions
7
Applied Instructions
8
Interrupt Function and Pulse Catch Function
A
Relationships between devices and addresses
7.9.8 RS2
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 PLC, 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. In the case of 14-point or 24-point type of FX3G PLC, ch2 cannot be used. Ch0 is applicable to FX3G
PLC only.
3. Applicable devices
FX3U(C) FX3G FX2N(C) FX1N(C) FX1S FXU/FX2C FX0N FX0(S)
Instruction
name
Operation
Execution
form
Expression in each language
Structured ladder 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
Const
ant
Real
Number
Character
String
Pointer
XYMTCS
D.b
KnX KnY KnM KnS T C D R
U\G
VZModifier K H E
""
P
zz z
zz z z
zz z
zz z z
zz
RS2
EN
s
ENO
m
n
n1
d