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6. MODE SWITCHING METHODS
MELSEC-A
6 . 2 Mode Switching Methods
6 . 2 . 1 Mode switching from an external device
Switching t o the no-protocol mode from a dedicated protocol mode (1 to 4) is
done by the following method.
However, the set value of the special-applications area (buffer addresses
100H to 11
FH)
of the AlSJ71C24 is set at a default value. Data communica-
tions must be done in the default value state.
Use a PC CPU to (a) switch to a mode other than the above, or (b) switch
the set value in the buffer special-applications area (see Sections 6.1 and
6.2.2).
CW command
(see
Section 8.9)
I
I
Initial processing
(about 4 seconds)
A1 a 7 1 C24
U
READY
signal
.
~ o d e r n i ~ h i n g
v n v
-
mvsiuedmebnetspgleI-applii
baree
is re(urnedtoaddaddnnd~
\
Value at buffer
address 11 9H
0105H
L
Cumnt mode number
Sequence program
The operations and processing of the signal timings given in the figure are
explained below.
(1)
Use a CW command from an external device to write a mode switch
request and a mode number in the mode switching specification area
(buffer address 11 9H) of the AlSJ71 C24.
Mode number after switching (see Section 4.3.1).
I
Mode switch request
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