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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
13 High Speed Processing – FNC 50 to FNC 59
13.6 FNC 55 – HSZ / High Speed Counter Zone Compare
13.6.1 Program in which comparison result is set to ON when power is turned ON
[ZCP (FNC 11) instruction]
DHSZ instruction outputs the comparison result only when a counting pulse is input. Even if the current value of C235
is "0", Y010 remains OFF at the time of startup.
For initializing Y010, compare the current value of C235 with K1000 and K1200 and drive Y010 by DZCPP instruction
(for general zone comparison) as pulse operation only at the time of startup.
Refer to the program example shown below.
Explanation of operation
The outputs Y010 to Y012 are as shown below:
Program example
Timing chart
In the part [1] in the timing chart, Y010 remains OFF if the current value of a high speed counter (C235 in the example
below) is "0" when restoring the power.
1) For initializing Y010, the current value of C235 is compared with K1000 and K1200, and Y010 is driven using the
DZCPP instruction (for general zone comparison) as pulse operation only upon startup.
2) The comparison result in Y010 is latched until an input pulse is input and the comparison output is driven by the
DHSZ instruction.
3) According to the current value of the counter, the DHSZ instruction drives the output (A), (B) or (C).
Y010 = ON Y011 = ON Y012 = ON
1000 1200
Current value of C235
0
X010
RST C235
C235
M8000
RUN monitor
X010
FNC 11
DZCPP
K1000 K1200 C235 Y010
K9999
…
pulse input: X000
FNC 55
DHSZ
K1000 K1200 C235 Y010
Start
FNC 40
ZRST
Y010 Y012
Y010 to Y012 are reset.
Immediately after start, comparison is
executed only once.
K1000
>
C235 :Y010 ON
K1000
≤
C235
≤
K1200 :Y011 ON
K1200
<
C235 :Y012 ON
After start, comparison is executed
when each pulse is input from X000.
K1000
>
C235 :Y010 ON
K1000
≤
C235
≤
K1200 :Y011 ON
K1200
<
C235 :Y012 ON
S
1
D
S
2
S