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3. SPECIFICATIONS
M ELSEC-A
3.4.2
Procedure for switching the mode from an external device
Mode switching is executed via the interface of dedicated protocol (formats
1 tn
41
usino the " C W command.
. .- .,
- -
-
~
-
Before and after switching the mode, provide an interlock between sequence
program operations and the mode switching operation (see Section
3.4.1 (1)-
(3)).
The mode switching procedure is shown below.
(1)
Normal mode switching
(CW command
.....
See Section 8.9.)
. . . . . . .
. . . - - -
Wder datato
bunw memay
External device
address 1 1 9 ~ .
AJ71 UC24
. . . . - -
. I
'
in the switched
I.
(1)
AJ71 UC24 READY sigml
(Xn7)
Data in buffer
memory address
' W ) H
119H
0 orcurrent mode n u " ! b e r
applications area.
Switches the mode switch-
'
Sequence program
from 02H to OOH.
(2)
Forced mode switching
(CW command
.....
See Section8.9.)
. . . . .
-
-
. . . . - .
-
Wntes datato
buner mermry
External device
address 1 1 9 ~ .
[
The AJ71 UC24 does not transmit the
AJ71 UC24
. . . . . .
response message.
I.
(1)
4
Initial processing (Approx. 4 sec.)
A J ~ I
uc24
READY signal
t
Mods witching
(Xn7)
(2)
(3)
Returning the data (stored in
the buffer
msrnory's
special
applications area) to the de-
fault state (4)
Data in buffer
memory address
o'w
l H
% '
8lO[]H
119H
1
I
0 or current mode number
Mode number of the request to switch
Writes the set data to the
buffer memo+
special
applications area.
Switches the mode switch-
Sequence program
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