Mitsubishi Electric Q26UD(E)HCPU User Manual page 469

Number Name
User timing clock
SM420
n2 scan
No.0
User timing clock
SM421
No.1
User timing clock
SM422
No.2
User timing clock
SM423
No.3
User timing clock
SM424
No.4
User timing clock
SM430
No.5
User timing clock
SM431
No.6
User timing clock
SM432
No.7
User timing clock
SM433
No.8
User timing clock
SM434
No.9
(4) Scan information
Number Name
Low speed OFF: Completed or not
SM510 program execution
flag ON: Being executed
Reads module OFF: Ignored
SM551
service interval ON: Read
(5) I/O refresh
Number Name
Program to
OFF: Not refreshed
SM580 program I/O
ON: Refreshed
refresh
*1 Modules whose function version B or later
Meaning Explanation
• This relay repeatedly turns on and off
n2 scan
at the specified scan intervals.
• This relay starts with off at power-on or
n1 scan reset of the CPU module. (For the
redundant CPU, however, this relay will
become always off after system
switching.)
• The on/off scan intervals are set by the
DUTY instruction.
DUTY
n1: On scan interval
n2: Off scan interval
For use with SM420 to SM424 low speed
programs
Meaning Explanation
This relay is on while a low-speed
executed execution type program is being
executed.
When this relay is turned on, the service
interval of the module specified by SD550
is read to SD551 and SD552.
Meaning Explanation
When this relay is turned on, I/O refresh
is performed after execution of the first
program, and then the next program is
executed. When a sequence program
and a SFC program are to be executed,
the sequence program is executed, I/O
refresh is performed, and then the SFC
program is executed.
Set by
(When Set)
n1 n2 SM420
S (Every
END
processing)
Set by
(When Set)
S (Every
END
processing)
U
Set by
(When Set)
U
APPENDICES
Corresponding
Corresponding
ACPU
CPU
M9
M9020
M9021
M9022
QCPU
LCPU
M9023
M9024
Qn(H)
New
QnPH
Corresponding
Corresponding
ACPU
CPU
M9
Qn(H)
New
QnPH
Qn(H)
New QnPH
QnPRH
Corresponding
Corresponding
ACPU
CPU
M9
*1
New
Q00J/Q00/Q01
467
A