163
FX
3UC
Series Programmable Controllers
User’s Manual - Hardware Edition
5 Input Specifications and External wiring
5.5 High-speed Counters (C235 to C255)
1
O
utline
2
Exter
nal
D
im
en
sions
3
Ge
ne
ric
Speci
ficat
ions
4
Pow
er Suppl
y
Specif
icati
ons
5
Input
Spec
ific
ations
6
O
utput
Specif
icat
ions
7
Exam
pl
es
of
W
iri
ng
fo
r
Va
rious U
ses
8
Te
rm
inal B
lock
9
CC
-L
in
k/L
T
Ma
ste
r F
X
3UC
(LT
only)
10
D
ispl
ay m
odule
FX
3UC
(L
T only)
1) Calculation of overall frequency
The overall frequency is calculated using the above table according to the high-speed comparison
instructions being used in the program.
Overall frequency
≥
Sum of "response frequency of high-speed counter
×
Magnification for
calculation of overall frequency"
2) Example of calculation
When only the HSZ instruction is used six times in a program, the frequency is calculated by the formulas
shown in the "Only HSZ instruction" column in the above table.
High-speed counter No. to be
used
Input
frequency
Calculation of max.
response frequency
Magnification
for
calculation of
overall
frequency
Instruction
to be used
C237
Operation as
software counter
20kHz
30 - 6(times) = 24kHz
×
1
HSZ instruc-
tion is used
six times.
C241
Software counter
10kHz
30 - 6(times) = 24kHz
×
1
C253 (OP)
[
4 edge count
]
2kHz
{
30 - 6(times)
}
/ 4 = 6kHz
×
4
1) The overall frequency is calculated as shown below because HSZ instruction is used six times.
Overall frequency = 50 - 1.5
×
6 = 41kHz
2) The sum of the response frequencies of the high-speed counters used is
calculated as shown below.
"20kHz
×
1[C237]" + "10kHz
×
1[C241]" + "2kHz
×
4[C253(OP)]" = 38kHz
≤
41kHz
Содержание FX3UC Series
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