Mitsubishi Electric MELSEC-A User Manual page 50

3. SPECIFICATIONS
MELSEC-A
(6) (Normal)
After the switch-completed and READY signals have been turned ON, the
PC CPU turns OFF the request-to-switch-mode signal.
For data communications with the set data in the AJ71 UC24 buffer memory's
special applications area set to a value other than the default, write the
necessary data from the PC CPU to the area at the rise of the AJ71 UC24
READY signal (Xn7).
(Forced) In response to the READY signal turned ON and the higher bytes changed
to 02H in the mode switching designation area described in step
( 5 ) ,
write
the set data for data communications in the switched mode to the AJ71 UC24
buffer memory's special applications area using the sequence program.
However, writing the set data is unnecessary if data can be communicated
using the default data in the special applications area.
(7) (Forced) Use the sequence program to read the data in the AJ71UC24 buffer mem-
ory's mode switching designation area and write O O H to the higher bytes.
WAND
1
(16-bit l + a l txoc!uct)
WFFH
Sets the higher bytes to O O H .
(8) (NormaltForced) After switching the mode, communicate data to provide an interlock between
the external device and the AJ71 UC24 (sequence program).
This operation notifies all connected devices that the data has been set (
in the buffer memory's special applications area and that data communi-
cations is enabled in the switched mode.
1
To change data other than that stored in the AJ71UC24 buffer memory's
special applications area (address 119H) in mode switching, write new
data at the rise of the AJ71 UC24 READY signal (Xn7) triggered by mode
switching.