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FX Series Programmable Controlers Applied Instructions 5
5-64
d) The output device is limited to Y0 or Y1 onl
y
and should be transistor t
y
pe.
e) This instruction can onl
y
be used once within a pro
g
ram scan. Also, onl
y
one of either FNC
57 PLSY or FNC 59 PLSR can be in the active pro
g
ram at once.
f) If the number of pulses is not enou
g
h to reach the maximum frequenc
y
then the frequenc
y
is
automaticall
y
cut
g
) Special auxiliar
y
coil M8029 turns ON when the specified number of pulses has been
completed. The pulse count and completion fla
g
(M8029) are reset when the PLSR
instruction is de-ener
g
ized.
h)
Acceleration time limitations
The acceleration time S
3
has a maximum limit of 5000 ms. However, the actual limits of S
3
are
determined b
y
other parameters of the s
y
stem accordin
g
to the followin
g
4 points.
1) Set S3 to be more than 10 times the maximum pro
g
ram scan time (D8012).
If set to less than this, then the timin
g
of the acceleration steps becomes uneven.
2) The followin
g
formula
g
ives the minimum value for S
3
.
3) The followin
g
formula
g
ives the maximum value for S
3
.
4) The pulse output alwa
y
s increments in 10 step up to the maximum frequenc
y
as shown on
the previous pa
g
e.
If the parameters do not meet the above conditions, reduce the size of S
1
.
It is possible to use subroutines or other such pro
g
rammin
g
techniques to isolate differen
instances of this instructions. In this case, the current instruction must be deactivated befor
e
chan
g
in
g
to the new instance.
S
3
≥
S
1
90000
×
5
S
3
≤
S
1
S
2
×
818
• Possible output frequenc
y
is limited to 2 to 20,000 Hz. If either the maximum frequenc
y
or
the acceleration step size are outside this limit then the
y
are automaticall
y
ad
j
usted to brin
g
the value back to the limit.
• If the drive si
g
nal is switch off, all output stops. When driven ON a
g
ain, the process starts
from the be
g
innin
g
.
• Even if the operands are chan
g
ed durin
g
operation, the output profile does not chan
g
e.
The new values take effect from the next operation.