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APPENDIX
App - 3
(2) Communications specifications
Data bit and stop bit settings differ.
Correct the BASIC program.
Data bit
Stop bit
(3) Common memory backup
Common memory backup is as shown below.
Common Memory
In the QD51 (-R24), common memory is not backed up by a battery. If backup is
necessary, use the programmable controller CPU's file register (R).
Replace the part of the BASIC program, which is used for reading or writing the
common memory by the GETMEN/PUTMEN command, with the one for reading
or writing the file register (R) by the PCRD/PCWT command.
(4) Task start signal (Y19)
If the task start signal (Y19) has been used to start a task, add the exclusive
command YCHECK.
In the A1SD51S or AD51H-S3, a task starts as an interrupt to the module when
the task start signal (Y19) turns ON.
As the QD51 (-R24) monitors the task start signal (Y19) at 10ms intervals to start
tasks, the start timing is different between the QD51(-R24) and the A1SD51S or
AD51H-S3. Executing the dedicated YCHECK command as shown below makes
the start timing the same as the A1SD51S or AD51H-S3.
Start
AD51H-S3
A1SD51S
5, 6, 7, 8
5, 6, 7, 8
1, 1.5, 2
1, 1.5, 2
AD51H-S3
A1SD51S
Backed up
Backed up
MELSEC-Q
QD51(-R24)
7, 8
1, 2
QD51(-R24)
Not backed up
Specify Task 1.
Specify Task start.
Execute Y check.
App - 3
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