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FX Series Programmable Controlers Applied Instructions 5
5-61
5.6.8 PLSY (FNC 57)
Operation:
A specified quantit
y
of pulses S
2
is output throu
g
h
device D at a specified frequenc
y
S
1
. This
instruction is used in situations where the quantit
y
of outputs is of primar
y
concern.
Points to note:
a) Users of the FX PLC can specif
y
output
frequencies (S
1
) of 1 to 1000Hz. Users of FX
Version 2.2 or earlier will need to initialize the
PLSY instruction. The pro
g
ram to the ri
g
ht can be
used to achieve this. FX
0
/FX
0N
users ma
y
use
frequencies of 10to 2000Hz. FX
2N
users ma
y
use
frequencies of 2 to 20000Hz.
b) The maximum number of pulses: 16 bit operation:
1 to 32,767 pulses, 32 bit operation: 1 to 2,147,483,647 pulses.
Note: special auxiliar
y
coil M8029 is turned ON when the specified number of pulses has
been completed. The pulse count and completion fla
g
(M8029) are reset when the PLSY
instruction is de-ener
g
ized. If “0" (zero) is specified the PLSY instruction will continue
g
eneratin
g
pulses for as lon
g
as the instruction is ener
g
ized.
c) A sin
g
le pulse is described as havin
g
a 50% dut
y
c
y
cle. This means it is ON for 50% of the
pulse and consequentl
y
OFF for the remainin
g
50% of the pulse. The actual output is
controlled b
y
interrupt handlin
g
, i.e. the output c
y
cle is NOT affected b
y
the scan time of the
pro
g
ram.
d) The data in operands S
1
and S
2
ma
y
be chan
g
ed durin
g
execution. However, the new data
in S
2
will not become effective until the current operation has been completed, i.e. the
instruction has been reset b
y
removal of the drive contact.
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) Because of the nature of the hi
g
h speed output, transistor output units should be used with
this instruction. Rela
y
outputs will suffer from a
g
reatl
y
reduced life and will cause false
outputs to occur due to the mechanical ‘bounce’ of the contacts.
To ensure a ‘clean’ output si
g
nal when usin
g
transistor units, the load current should be
200mA or hi
g
her. It ma
y
be found that ‘pull up’ resistors will be required.
Mnemonic Function
Operands
Program steps
S
1
S
2
D
PLSY
FNC 57
(Pulse Y
output)
Outputs a
specified number
of pulses at a set
frequenc
y
K, H,
KnX, KnY,
KnM, KnS,
T, C, D, V, Z
Y
Note:
FX
0(S)
/FX
0N
users:
Y000 onl
y
.
FX users:
an
y
Y
PPP
.
FX
2N(C)
users: Y000 or
Y001 onl
y
.
PLSY:
7 steps
DPLSY:
13steps
X10
D 0K1000 Y 0PLSY
[ S1 ]
[ S2 ]
[ D ]
S2 D
PLSY
M8002
M8034
M8002
S1
It is possible to use subroutines or other such pro
g
rammin
g
techniques to isolate different
instances of this instructions. In this case, the current instruction must be deactivated before
chan
g
in
g
to the new instance.