Program In Which Comparison Result Is Set To On When Power Is Turned On [Zcp (Fnc 11) Instruction] - Mitsubishi FX3U Series Programming Manual

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Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

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 DZCPP instruction (for general zone comparison) as pulse operation only at the time of startup.

2) The comparison result in Y010 is latched until an input pulse is input and the comparison output is driven

by DHSZ instruction.

3) According to the current value of the counter, DHSZ instruction drives the output (A), (B) or (C).

Current value of C235

K9999 ... pulse input: X000

13 High Speed Processing – FNC 50 to FNC 59

13.6 FNC 55 – HSZ / High Speed Counter Zone Compare

Y010 to Y012 are reset.

Immediately after start, comparison is

executed only in one scan.

K1000 > C235

K1000 ≤ C235 ≤ K1200 :Y011 ON

K1200 < C235

After start, comparison is executed

when a pulse is input from X000.

K1000 > C235

K1000 ≤ C235 ≤ K1200 :Y011 ON

K1200 < C235

Fx3uc series Melsec-f