F-52
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
FX
2N
(before Ver. 2.00), FX
2
(FX), FX
2C
, FX
0N
, FX
1S
, FX
1N
and FX
1NC
PLCs
FX
2N
PLCs before Ver. 2.00, and FX
2
(FX), FX
2C
, FX
0N
, FX
1S
, FX
1N
, FX
1NC
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 FX
2
(FX), FX
2C
, FX
0N
, FX
1S
, FX
1N
and FX
1NC
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
OFF
ON
Sending
request
M8122
RD (RXD)
Receive data
Receiving
complete
M8123
OFF
ON
ON
ON
OFF
100
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
ON
OFF
ER (DTR)
OFF
OFF
ON
ON
DR (DSR)
Message
1
Message
1
Message
2
Summary of Contents for FX-485ADP
Page 2: ......
Page 120: ...B 2 FX Series PLC User s Manual Data Communication Edition N N Network ...
Page 188: ...C 2 FX Series PLC User s Manual Data Communication Edition Parallel Link ...
Page 244: ...D 2 FX Series PLC User s Manual Data Communication Edition Computer Link ...
Page 344: ...E 2 FX Series PLC User s Manual Data Communication Edition Inverter Communication ...
Page 700: ...H 2 FX Series PLC User s Manual Data Communication Edition Programming Communication ...
Page 752: ...I 2 FX Series PLC User s Manual Data Communication Edition Remote Maintenance ...
Page 817: ......