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FX3G/FX3U/FX3UC 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
FNC30-FNC39
Rotation and
Shift
12
FNC40-FNC49
Data Operation
13
FNC50-FNC59
High Speed
Processing
14
FMC60-FNC69
Handy
Instruction
15
FNC70-FNC79
External FX I/O
Device
16
FNC80-FNC89
External FX
Device
17
FNC100-FNC109
Data
Transfer 2
18
FNC110-FNC139
Floating Point
19
FNC140-FNC149
Data
Operation 2
20
FNC150-FNC159
Positioning
Control
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 only be used once.
• The maximum frequency of turning the inputs X000 to X007 ON and OFF is shown below:
-FX
3U/FX3UC 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 kΩ (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
.
2) When using the 32-bit operation
Six devices are occupied from a device specified in
*2
.
*2. The value is updated by interrupt processing from the CPU, not every scan time (operation cycle) of the PLC.
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
FX3UC PLC
FX3U PLC
Main unit FX3U-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
FX3G PLC
X000,X001,X003,X004 60 kHz
X002,X005,X006,X007 10 kHz
Applicable version
Item Outline of function
FX3G FX3U FX3UC
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