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FX
3G
/FX
3U
/FX
3UC
 Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.7 High Speed Counter [C] (FX3U/FX3UC PLC)
1
In
trodu
ct
ion
2
O
ver
vi
ew
3
In
st
ru
ct
ion 
Li
st
4
D
evices 
in D
etail
5
Specifi
ed t
he
D
evice &
 
C
onst
ant
6
Bef
ore 
Pr
ogr
am
m
ing
7
B
asic 
In
st
ru
ct
ion
8
FNC0
0-F
NC0
9
Pr
ogr
am
 Flow
9
FN
C
10-FN
C
19
Mo
ve
 &
 Co
mp
are
10
FNC2
0-F
NC2
9
Ar
ith.
 &
 Logic 
O
per
ati
on
4.7.10 Response frequency of high speed counters
1. Response frequency of hardware counters
The table below shows the maximum response frequency of hardware counters.
When hardware counters are handled as software counters in some operating conditions, their maximum response
frequency becomes equivalent to that of software counters, and thus hardware counters are some times subject to
restrictions in total frequency.
→ For the conditions in which hardware counters are handled as software counters,
refer to the previous page.
2. Response frequency and total frequency of software counters
The table below shows the maximum response frequency and total frequency of software counters.
When using the HSZ or HSCT instruction in a program, both the maximum response frequency and the total frequency
are limited for all software counters without regarding the operands of the instruction.  When examining a system or
creating a program, consider the limitations, and use software counters within the allowable range of maximum
response frequency and total frequency.
→ For the conditions handled as software counters, refer to the previous page.
1) When special analog adapters and FX
3U
/FX
3UC
 Series special function blocks/units are not used
*1.
When an index register is added to a counter number specified by a HSCS, HSCR, HSZ or HSCT instruction,
all hardware counters are switched to software counters.
*2.
The high speed counters C244 (OP) and C245 (OP) can count up to 10 kHz.
Counter type
Counter No.
Maximum response frequency
Main unit
FX
3U
-4HSX-ADP
1-phase 1-counting input
C235, C236, C237, C238, C239, C240
100 kHz
200 kHz
C244(OP), C245(OP)
10 kHz
1-phase 2-counting input
C246, C248(OP)
100 kHz
2-phase 2-counting 
input
1 edge count
C251, C253
50 kHz
100 kHz
4 edge count
50 kHz
100 kHz
Magnifica-
tion for 
calculating 
total 
frequency
Response frequency and total frequency according to instructions used
Counter type
Software 
counter
Following 
software 
counter with 
HSCS, HSCR, 
HSZ or HSCT 
instruction
*1
When HSZ and HSCT 
instructions are not 
used
When only HSCT 
instruction is used
When only HSZ 
instruction is used
When both HSZ and HSCT 
instructions are used
Maximum 
response 
frequency 
(kHz)
Total 
frequency 
(kHz)
Maximum 
response 
frequency 
(kHz)
Total 
frequency 
(kHz)
Maximum 
response 
frequency 
(kHz)
Total 
frequency 
(kHz)
Maximum 
response 
frequency 
(kHz)
Total 
frequency 
(kHz)
1-phase 
1-counting 
input
C241,
C242,
C243,
C244,
C245
C235, C236,
C237, C238,
C239, C240
×1
40
80
30
60
40 - (Num-
ber of 
instruc-
tion)
*2
80
−
1.5
×(Num
ber of 
instruc-
tion)
30-(Number 
of instruc-
tion)
*2
60
−
1.5
×(Num
ber of 
instruc-
tion)
−
C244(OP),
C245(OP)
×1
10
10
1-phase 
2-counting 
input
C247,
C248,
C249, C250
C246,
C248(OP)
×1
40
30
2-
phase 
2-
count-
ing 
input
1 edge 
count C252,
C253(OP),
C254,
C255
C251, C253
×1
40
30
4 edge 
count
×4
10
7.5
(40-Num-
ber of 
instruc-
tion) 
÷ 4
(30-Number 
of instruc-
tion) 
÷ 4