
B-63983EN/02 10.STEP SEQUENCE FUNCTION
- 995 -
10.5.3 Exclusive Control for Functional Instructions
The use of the following functional instructions is restricted in steps
and transitions.
Group Description Functional
instructions
The instructions operate when a signal
changes.
Condition Multiple functional instructions
having the same number are
used.
A
Problem Not activated.
Correct operation cannot be
guaranteed.
CTR (SUB5)
CTRC (SUB60)
TMR (SUB3)
TMRB (SUB24)
TMRC (SUB54)
DIFU (SUB57)
DIFD (SUB58)
Restriction due to the interface.
Condition Data is input or output by using
two subprograms.
B
Problem Invalid return value.
Not terminated.
WINDR (SUB51)
WINDW (SUB52)
DISP (SUB49)
DISPB (SUB41)
EXIN (SUB40)
AXCTL (SUB53)
(1) Functional instructions of group A
Since these functional instructions operate when the
corresponding signals change, they may not operate correctly
when called from multiple steps.
Example)
While multiple CTR functional instructions are used, when
control passes from S1 to S2 with ACT of CTR not set to
off, CTR is not counted when called from step S2.
CTR 1
S1
(P100)
Subprogram P100
R0.0
( )
S2
(P100)
X1.0
Subprogram P1
X1.0
TRSET
P1