Mitsubishi FX3U-232-BD User Manual

F-40
FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
6 Creating Programs (RS Instruction)
6.3 Operation of Control Line
6.3 Operation of Control Line
6.3.1 FX2(FX), FX2C, FX1S, FX0N, FX1N, FX1NC, and FX2N (before Ver. 2.00) PLCs
FX2, FX2C, FX1S, FX0N, FX1N, FX1NC, and FX2N (before Ver. 2.00) PLCs execute half-duplex, bidirectional
communication.
When the sending flag is set to ON during receiving, the sending wait flag M8121 turns ON. When the
receiving complete flag turns ON from OFF, the PLC starts to send.
1. When the control line is not provided
*1. Set it to 2 scan times or more in FX1S, FX0N, FX2(FX), FX2C, FX1N, and FX1NC PLCs.
2. When the control line is in the standard mode
Use this mode when only sending or receiving.
1) When only sending is executed
Reset it in a sequence program.
While it remains ON, the PLC cannot receive the next set of data.
Message
1
RS
instruction
driving
Sending wait
flag
M8121
SD (TXD)
Send data
OFF ON
OFFON
Sending
request
M8122
RD (RXD)
Receive data
Receiving
complete
M8123
OFF ON ON
ONOFF
100 µ s or more
*1
Receiving wait status
is started.
Message
3
Message
3
Message
2
RS
instruction
driving
SD (TXD)
Send data
OFF ON
Sending
request
M8122
ONOFF
ER (DTR)
OFF
OFF
ON
ON
DR (DSR)
Message
1
Message
1
Message
2

Mitsubishi FX3U-232-BD Specifications

General

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