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5-10
Chapter 5. FUNCTIONS
■
PV start
If PV start is set in the program setup, PV is
started by regular RUN operation.
The first point where PV matches the SP in the
program pattern (including bias for both PV and
SP) is searched for, and operation is started
from that point.
However, note that if a matching point is not
found, operation is started from the beginning
of segment 1.
You can select in the program setup which
channel, CH1 or CH2, PV and SP is to be used.
When PV has started, event operating points
and the time of time events are automatically
corrected. If the PV start function is selected by
setup data
C52
to
C54
settings relating to
external switch input, PV start can be executed
without setting PV start in the program setup.
PV start is valid on the segment of the currently
selected program, and is invalid on the segment
of the pattern link destination.
■
Cycle
The cycle function is for repeating operation
from the No.1 segment of the program pattern
to the final set segment for a preset number of
cycles. The number of cycles can be set up to
9999.
When a number of cycles “n” is set, the
operation count becomes “n+1”.
When executing cycle operation, operation at
the end point of the final segment is not carried
out, and operation is restarted with the effective
value (setting of previous segment continued)
of the program item (e.g. PV event value, PID
set No.) whose setting is continuous from the
previous segment cleared. At this time, PV is
not started and operation starts from the No.1
segment even if PV start is set.
If the SPs at the pattern start and end points do
not match, the SP changes in a stepped manner
during cycle operation.
Cycle operation functions simultaneously on
both patterns of SP1 and SP2.
C
A
①
'
①
①
''
①
'
PV starts at point B where the PV value first crosses
the SP pattern.
①
PV starts at point A where the PV value first crosses
the SP pattern.
①
''
Point C of segment 1 is the PV start point since there is
no point where the PV value crosses the SP value.
A'
B
SP pattern
Start point
Start point
Start point
Current PV value
PV start points
②
①
③
Cycle 1
SP
④
⑤
⑥
Time