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MELSEC-Q
4 SEQUENCE PROGRAM CONFIGURATION AND EXECUTION
CONDITIONS
2) When changing the execute type of the scan execution type programs
and stand-by type programs by the scan execution type programs
having the condition for switching the execution type.
• The scan execution type program being executed changes the next
program to be executed from a stand-by type program to a scan
execution type program.
• If the condition realizes when "ABC" and "GHI" programs have been
set to scan execution type, and "DEF" program to stand-by type, the
execute types of "ABC" and "DEF" programs are switched as shown
below.
[Before execution of PSCAN and PSTOP instructions]
Scan execution type program : ABC
PSCAN
"DEF"
M0
PSTOP
"ABC"
• "PSCAN" is an instruction that switches
the specified "DEF" program to a scan
type program.
• "PSTOP" is an instruction that switches
the specified "ABC" program to a stand-
by type program.
Stand-by type program: DEF
PSCAN
"GHI"
PSTOP
"DEF"
Scan execution type program : GHI
PSCAN
"ABC"
PSTOP
"GHI"
When M0 is on
[After execution of PSCAN and PSTOP instructions]
Stand-by type program: ABC
PSCAN
"DEF"
M0
PSTOP
"ABC"
Scan execution type program: DEF
PSCAN
"GHI"
PSTOP
"DEF"
Scan execution type program : GHI
PSCAN
"ABC"
PSTOP
"GHI"
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