89
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.7 High Speed Counter [C]
1
In
troduct
io
n
2
Ov
e
rv
ie
w
3
In
st
ru
ct
ion
Li
st
4
D
evi
ce
s
in
De
ta
il
5
Speci
fied t
h
e
D
evi
ce &
C
onst
a
nt
6
Bef
o
re
Pr
ogr
a
m
m
ing
7
Bas
ic
In
st
ru
cti
o
n
8
FNC0
0
-FNC0
9
P
ro
g
ra
m F
lo
w
9
FNC1
0
-FNC1
9
M
ov
e
&
C
om
par
e
10
FNC
20-
FNC
2
9
Ar
ith.
&
Logi
c
O
per
at
io
n
5. High speed counter device list
*1.
They are handled as software counters depending on the operating condition. When they are handled
as software counters, they are subject to restrictions depending on both limitations of maximum
response frequency and total frequency.
→
For the condition handled as software counters,
refer to Subsection 4.7.9.
→
For the total frequency, refer to Subsection 4.7.10.
*2.
Cautions on wiring should be considered for these high speed counters.
→
For the wiring, refer to the Hardware Manual of the main unit.
*3.
C244, C245 and C248 are usually used as software counters, but can be used as hardware counters
C244 (OP), C245 (OP) and C248 (OP) by combining a special auxiliary relay (M8388, M8390 to
M8392).
→
For the method to switch the counter function, refer to Subsection 4.7.7.
*4.
2-phase 2-input counter is usually 1 edge count counter, but can be used as a 4 edge count counter by
combining a special auxiliary relay (M8388, M8198 or M8199).
→
For the method to use a 2-phase 2-input 4 edge count counter,
refer to Subsection 4.7.8.
*5.
The external reset input is usually reset by turning ON, but can be changed to be reset by turning OFF
by combining special auxiliary relays (M8388 and M8389).
→
For the method to change the logic of the external reset input, refer to Subsection 4.7.6.
*6.
The counter C253 is usually used as a hardware counter, but can be used as the counter C253 (OP)
not equipped with the reset input by combining special auxiliary relays (M8388 and M8392).
However, C253 (OP) is handled as a software counter at this time.
Classification
Counter No.
Edge count
Data length
External reset
input terminal
External start
input terminal
1-phase
1-counting
input
Hardware
counter
*1
C235
*2
C236
*2
C237
*2
C238
*2
C239
*2
C240
*2
−
32-bit
bi-directional
counter
Not provided
Not provided
C244(OP)
*3
C245(OP)
*3
−
Software counter
C241
C242
C243
−
Provided
*5
Not provided
C244
*3
C245
*3
−
Provided
*5
Provided
1-phase
2-counting
input
Hardware
counter
*1
C246
*2
C248(OP)
*2*3
−
32-bit
bi-directional
counter
Not provided
Not provided
Software counter
C247
C248
*3
−
Provided
*5
Not provided
C249
C250
−
Provided
*5
Provided
2-phase
2-counting
input
Hardware
counter
*1
C251
*2
1
*4
32-bit
bi-directional
counter
Not provided
Not provided
4
*4
C253
*2
1
*4
Provided
*5
4
*4
Software counter
C252
1
*4
Provided
*5
Not provided
4
*4
C253(OP)
*6
1
*4
Not provided
4
*4
C254
C255
1
*4
Provided
*5
Provided
4
*4
Содержание FX3U Series
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