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Mitsubishi Electronics FX3G User Manual

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109
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
 Series
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.7 High-Speed Counter [C] (FX3S/FX3G/FX3GC PLCs)
1
Introdu
ction
2
Ov
ervi
ew
3
Instruction 
Li
st
4
D
evices 
in Det
ai
l
5
Specifi
ed the
De
vice
 &
 
C
onst
ant
6
Bef
ore
 
Pr
og
ra
mmi
ng
7
Bas
ic 
Instruction
8
FN
C00-FN
C0
9
Program Fl
ow
9
FNC
10-FN
C19
Mov
e & Com
pare
10
FNC
20-FNC
29
Arith. & Lo
gi
c 
Operati
on
4.7.2
Input assignment for high-speed counters
Inputs X000 to X007 are assigned as shown in the table below according to each high-speed counter number.
When a high-speed counter is used, the filter constant of a corresponding input number in the main unit automatically
changes.
• FX
3S 
PLC
X000, X001: 10 
µ
s
X002, X003, X004, X005, X006, X007: 50 
µ
s
• FX
3G
/FX
3GC 
PLCs
X000, X001, X003, X004: 10 
µ
s
X002, X005, X006, X007: 50 
µ
s
Input terminals not used for high-speed counters, however, can be used as general inputs.
→ For the input specifications of the main unit, refer to the Hardware Edition of the main unit.
U: Up-counting input
D: Down-counting input
A: A phase input
B: B phase input
R: External reset input
S: External start input
Restriction to overlap input numbers
Inputs X000 to X007 are used for high-speed counters, input interrupt, pulse catch, SPD/ZRN/DSZR instructions and 
general-purpose inputs. When assigning functions, there should be no overlap between those input terminals.
Counter No.
Input terminal assignment
X000
X001
X002
X003
X004
X005
X006
X007
1-phase
1-count 
input
C235
U/D
C236
U/D
C237
U/D
C238
U/D
C239
U/D
C240
U/D
C241
U/D
R
C242
U/D
R
C243
U/D
R
C244
U/D
R
S
C245
U/D
R
S
1-phase
2-count 
input
C246
U
D
C247
U
D
R
C248
U
D
R
C248(OP)
U
D
C249
U
D
R
S
C250
U
D
R
S
2-phase
2-count 
input
C251
A
B
C252
A
B
R
C253
A
B
R
C253(OP)
A
B
C254
A
B
R
S
C254(OP)
A
B
C255
A
B
R
S