G-30
FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (FX2N-232IF)
5 Creating Programs
5.5 Operation of Control Line
5.5 Operation of Control Line
5.5.1 When control line is not provided [BFM #0, (b9, b8) = (0, 0)]
Sending/
receiving enable
(BFM#1 b0)
Sending
command
(BFM#1 b1)
SD(TXD)
Send data
Sending
complete
(BFM#28 b0)
RD(RXD)
Receive data
Receiving
complete
(BFM#28 b1)
Receiving
complete flag
reset command
(BFM#1 b2)
Message 1
Message 4
Time set by BFM #20
multiplied by 10 ms
Time set by BFM #20
multiplied by 10 ms
Set this bit to OFF in the sequence
program. While it remains ON,
the next data cannot be sent.
OFF
OFF
OFF
OFF
OFF
The receiving waiting
status is started.
Message 2
After receiving is completed and the received
data is read, set the receiving complete flag
(BFM #28, b1) to OFF using the receiving
complete flag reset command.
Set this bit to OFF in the sequence program
While it remains ON, the next receiving
complete flag reset command cannot be
given.
Set this bit to OFF in the
sequence program.
While it remains ON, the
next receiving complete
flag reset command
cannot be given.
ON
ON
Message 3
ON
ON
ON
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