165
FX
3UC
Series Programmable Controllers
User’s Manual - Hardware Edition
5 Input Specifications and External wiring
5.7 Pulse Catch (M8170 to M8177)
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)
5.7
Pulse Catch (M8170 to M8177)
The PLC (main unit) is provided with a pulse catch function and has 8 pulse catch input points.
1. Allocation of special memories to input numbers (ON duration of input signals)
→
For details on programming, refer to the programming manual.
→
For the wiring, refer to Section 7.3.
2. Non-overlap of input numbers
The input terminals X000 to X007 can be used for high-speed counter, input interruption, pulse catch, speed
detection (SPD) instructions and general-purpose input.
Take care not to overlap the input numbers.
Example:
When the pulse catch input contact M8170 is used, X000 is occupied. Therefore, it is impossible to use C235,
C241, C244, C246, C247, C249, C252 and C254, input interruption (including delay interruption) pointers
I000 and I001 and SPD, ZRN, DSZR and DVIT instructions at the same time.
Input No.
Contact on sequence program
ON duration of input signal
X000
M8170
5
µ
s or more
X001
M8171
X002
M8172
X003
M8173
X004
M8174
X005
M8175
X006
M8176
50
µ
s or more
X007
M8177
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