9.
COMMUNICATIONS
IN
THE
NO-PROTOCOL
MODE
MELSEC-A
9.2
Handshake
I/O
Signals
Signals known as
1/0
handshake signals are required for no-protocol com-
munications.
These signals (a) output data received from the sequence program to an
external device, or
(b)
detect signals from an external device to enable the
sequence program to read them.
\I
Signal
cpu
Y(n+c)O
(Send request)
L
External
device
XI0
(Send completed)
Xnl (Received data read request)
dwice
L
PCCPu
Y(n+c)l (Receive data read completed)
Timing
,
TU&
OFF
by
pr00~
Turned
OFF
byAnlC24
Turned
ON
by
An1
C24
Turned
OFF
by
AnlC24
Turned ON
by
AnlC24
Turned
OFF
by
program
Tumed
ON
by
program
d
3
.I
d
-7
Y
I-.
9-2
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