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4 SFC PROGRAM CONFIGURATION
MELSEC-Q
(11) While SFC program is not executed, reading comments is not performed even if executing
S(P).SFCTCOMR instruction.
Executing S(P).SFCTCOMR at a status of SFC program not being activated, 0 is stored to
"total number of transition conditions (
D1
+0)" and "the number of transition condition that
have read comments (
D1
+1)".
At this time, the device specified in
D2
turns ON for 1 scan.
(12) With S(P). SFCTCOMR instruction, comments for the normal SFC program can be read.
Comments of a SFC program to control program execution are not read.
Executing S(P). SFCTCOMR instruction specifying the SFC program to control execution, 0
is stored to "the total number of transit conditions (
D1
+ 0)" and "the number of transient
conditions (
D1
+1) ".
At this time, the device specified in
D2
turns ON for 1 scan.
(13) S(P).SFCTCOMR instruction cannot be executed simultaneously with S(P).SFCTCOMR
instruction or S(P).SFCTCOMR instruction.
Executing S(P).SFCTOMR, and if S(P).SFCSCOMR instruction or S(P).SFCTCOMR
instruction is executed before reading comments completed, the 2nd instruction will be de-
activated.
REMARKS
(1) Make sure to use comments to be read with S(P).SFCTCOMR after the device
specified at
D2
turns ON. Comments to be read before the device specified at
D2
turns ON become an indefinite value.
(2) If the number of transition conditions associated with active steps is larger than
that of comments to be read in a single (n3), the active step comments are
divided into the number to be read in a single scan.
Counting the total number of steps is also performed with the same comment
number (n3) for 1 scan.
In case transition conditions are remained without being counted when reading
comments completed, the counting will be continued for the remained. Because
of this, the number of scans calculated in the following formula is required.
(Comments to be actually stored are the same points stored in
D1
+1)
The number of scans until S(P).SFCTCOMR
instruction completed
Total number of transition
conditions (
D1 +0)
The number of comments
to be read at 1 scan (n3)
: It becomes a round-up below the decimal point.
(3) Make sure to perform "batch write of SFC program in RUN status" or "write of
comment file in RUN status" with a status of S(P).SFCTCOMR instruction not
being executed.
In addition, make sure not to execute S(P).SFCTCOMR during "batch write of
SFC program in RUN status" or "write of comment file in RUN status".
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