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6.
MODE SWITCHING METHODS
MELSEC-A
6.2.2 Switching
the
mode
using a PC CPU
(1)
This section shows how to switch to a no-protocol/bidirectional mode
from a dedicated protocol mode (1 to 4).
1
U Data
communications
/
can be done in the
,
switched mode.
External
device
lnltml
processing
I
A1 SJ71
C24
(about
4
seconds)
'
A1 SJ71 C24 READY
signal (Xn7)
1
I
Value at buffer
address
1 19H
0005H
O O O O H
I
Sequence program
X--X
The operations and processing of the signal timings given in the figure
are explained below.
(a) Use a PC CPU to write the mode number to be switched to the mode
switching s p e c i f i c a t i o n a r e a (buffer address 119H) of t h e
AlSJ71 C24.
1
Number
to
be switched
(see
Section 4.3.1)
(b) Use the PC CPU to turn ON the mode switch request signal
(Y(n+1)9).
(c) The AlSJ71C24 turns the READY signal (Xn7) of the self OFF and
executes the following mode switching processing.
The mode of the AlSJ71C24 is switched,
The value of the special-applications area of the AlSJ71C24
buffer is returned to
a
default value (excluding the mode
switching specification area [buffer address 119H1).
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