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