3.
SPECIFICATIONS
MELSEC-A
3.4
Mode
Swttchlng Function During AJ71
C24
Operations
After an AJ71 C24 started operations, AJ71 C24's RS-232C/RS-422 interfaces
can be switched to another mode.
(Mode switching when the AJ71C24 is online)
As shown below, this operation can be executed from an external device and
a PC CPU.
3.4.1
Precautions
when
mode
switching
This section gives the precautions to take when data communications is
continued after switching the AJ71 C24 mode during AJ71 C24 operations.
(1) Settings between an external device and a PC CPU
Set the following items required to switch the mode between an external
device and
a
PC CPU.
Is
the mode switched from an external device or a PC CPU?
At
what intervals are modes switched for each mode switching
pattern?
Dedicated protocol (formats
1
to 4) mode:
Dedicated protocol (formats
1
to 4) mode
Dedicated protocol (formats 1 to 4) mode:
No-protocol/Bidirectional
mode
No-protocol/Bidirectional
mode:
Dedicated protocol (formats 1 to 4) mode
No-protocol mode
:
Bidirectional mode
Bidirectional mode
:
No-protocol mode
How is an interlock provided for all connected devices?
0
Method and message used to notify all connected stations of
0
Method and message used to notify all connected stations that
0
Device number and data description when PC CPU word devices
mode switching.
mode switching has been completed.
are used.
3- 16
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