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389
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
13 High Speed Processing – FNC 50 to FNC 59
13.7 FNC 56 – SPD / Speed Detection
11
FNC3
0-F
NC3
9
R
otati
on and
Shif
t
12
FNC4
0-F
NC4
9
D
ata
O
per
ati
on
13
FN
C
50-FN
C
59
H
igh Speed
Pr
ocess
ing
14
FM
C
60-
FN
C
69
H
andy
In
st
ru
ct
ion
15
FNC7
0-F
N
C7
9
Ex
ter
nal
FX
I/O
D
evice
16
FN
C
80-FN
C
89
Ext
ernal FX
De
vic
e
17
FN
C
100-
FN
C
109
Da
ta
Transf
er 2
18
FN
C
110-
FN
C
139
Fl
oati
ng Poi
nt
19
FN
C
140
-F
N
C
14
9
Da
ta
O
per
ati
on 2
20
FN
C
150-
FN
C
159
Posit
ioning
C
ontr
ol
Cautions
1. Input specifications of the input
• An input device X000 to X007 specified as
cannot overlap the following functions or instructions:
- High speed counter
- Input interrupt
- Pulse catch
- DSZR instruction
- DVIT instruction
- ZRN instruction
• For one input, this instruction can be used only once.
• The maximum frequency of turning the inputs X000 to X007 ON and OFF is shown below:
- FX
3U
/FX
3UC
PLC
*1.
When receiving pulses within the response frequency range of 50 k to 100 kHz, perform the following
actions:
-
Make sure that the wiring length is 5 m or less.
-
Connect a bleeder resistor of 1.5 k
Ω
(1 W or more) to the input terminal, and make sure that the
load current in the open collector transistor output of the external equipment is 20 mA or more.
- FX
3G
PLCs
2. Occupied devices
1) When using the 16-bit operation
Three devices are occupied from a device specified in
.
2) When using the 32-bit operation
Six devices are occupied from a device specified in
.
3. When a word device is specified as
.
If the word device value is changed while the instruction is being executed, the change affects the operation
in every measurement cycle.
Function change depending on the version
The function of the FNC 56 instruction varies depending on the PLC version shown in the table below.
Used input number
Maximum input frequency
FX
3UC
PLC
FX
3U
PLC
Main unit
FX
3U
-4HSX-ADP
X000 to X005
100 kHz
*1
100 kHz
*1
200 kHz
X006,X007
10 kHz
10 kHz
Used input number
Maximum input
frequency
FX
3G
PLC
X000,X001,X003,X004
60 kHz
X002,X005,X006,X007
10 kHz
Applicable version
Item
Outline of function
FX
3G
FX
3U
FX
3UC
Ver.1.00 or later Ver.2.20 or later Ver.2.20 or later Addition of 32-bit instruction 32-bit operations (DSPD) are enabled.
S
1
S
1
D
D
S
2