Delta DVP-PLC, Applications Manual

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7 Application Instructions API 50-99
D V P - P L C A P P L I C AT I O N M A N U A L
7 - 9
X10
X11
C243
C245
C250
C255
Co
m
pa
ra
to
r
High-speed
comparison instruction
Output reaches
comparative value
Set value 10
Set value 11
vi) Explanations on high speed counter and high speed comparator:
(1) When DHSCS and DHSCR instructions use the high speed counter (C243/C245/C250/C255),
they can only use the set values of 2 groups of high speed comparative instructions. Assume that
a group of comparative instruction DHSCS D0 C243 Y10 is already in use, you can only set
another group DHSCR D2 C243 Y10 or DHSCS D4 C245 Y10.
(2) When DHSZ instruction use the high speed counter (C243/C245/C250/C255), it can only use the
set value of a group of comparators.
(3) The number of set values in a high-speed comparative instruction offered in SA/SX series MPU
will not decrease becasus of the addition of the new high speed counters.
(4) If the high-speed comparative instruction DHSCS requires a high-speed reponse output, it is
suggested that you use Y10 or Y11 for the output. If you use other general devices for the output,
there will be delay of 1 scan period. For example, when in I0x0 interruption, C234 will correspond
to I020, C245 to I040 and C250/C255 to I060.
(5) The high-speed comparative instruction DHSCR can clear output devices and counter devices,
but only the counters used by the same instruction, e.g. DHSCR K10 C243 C243. This function
can only applied in the four special high speed counters C243, C245, C250 and C255.
e) Counting modes:
i) The 2-phase 2 inputs counting mode of the high speed counters in ES/EX/SS (V5.5 and above) and
SA/SX/SC series MPU is set by special D1022 with normal frequency, double frequency and 4 times
frequency modes. The contents in D1022 will be loaded in in the first scan when PLC is switched from
STOP to RUN.
Device No. Function
D1022 Setting up the multiplied frequency of the counter
D1022 = K1 Normal frequency mode selected
D1022 = K2 or 0 Double frequency mode selected (default)
D1022 = K4 4 times frequency mode selected