Mitsubishi FX3U-232-BD User Manual

F-37
FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
6 Creating Programs (RS Instruction)
6.2 How to Use RS Instruction
A
Common Items
B
N:N Network
C
Parallel Link
D
Computer Link
E
Inverter Communication
F
Non-Protocol Communication (RS/RS2 Instruction)
G
Non-Protocol Communication (FX
2N
-232IF)
H
Programming Communication
I
Remote Maintenance
Apx.
Discontinued models
2. Handling of 8-bit data (when M8161 is set to ON)
1) Send data and amount of remaining data
2) Receive data and amount of received data
Caution on other instructions using M8161
M8161 is shared by RS, ASCI, HEX, CCD, and CRC (provided only in FX
3U and FX3UC PLCs) instructions.
X010
FNC 80
RS
D200 K 4 D500 K 10
mn
8-bit mode
Ignored
Lowest-order 8-bit
16-bit data
Highest-order 8-bits are ignored,
and only the lowest-order 8-bits are
regarded as valid data.
M8000
M8161
STX
D200 lowest-
order byte
D201 lowest-
order byte
D202 lowest-
order byte
D203 lowest-
order byte
ETX
STX
D500 lowest-
order byte
D501 lowest-
order byte
D502 lowest-
order byte
D503 lowest-
order byte
D504 lowest-
order byte
D505 lowest-
order byte
ETX
Terminator
They cannot exceed the upper limit number of devices (bytes) to be
received, specified by "n". When the PLC receives the terminator (ETX) or
"n" data, receivin
g
is com
p
leted.
Terminator
Header
Header
Send data
(PLC
→
external
equipment)
Receive data
(external
equipment
→
PLC)
S  D 
Head address specified by
S 
Number of bytes to be sent specified by "m"
Head address specified by
D 
0
1
2
3
4
Amount of remaining
data
D8122
Send data
SD (TXD)
D200 lowest-order byte D201 lowest-order byte D202 lowest-order byte D203 lowest-order byte STX ETX
When the receiving
complete flag M8123
is reset, the amount of
received data is reset
also.
6
5
4
3
2
1
0
Receive data
RD (RXD)
Amount of received
data
D8123
D500 lowest-order byte D501 lowest-order byte D502 lowest-order byte D503 lowest-order byte D504 lowest-order byte D505 lowest-order byte STX ETX

Mitsubishi FX3U-232-BD Specifications

General

Brand	Mitsubishi
Model	FX3U-232-BD
Category	Controller
Language	English