7 Applied Instructions
7.6 High Speed Processing
306
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
Cautions
1. Input specifications of the input specified by
1) can specify the following ranges.
FX
3U, FX3UC, and FX3G PLCs: X000 to X007
FX
1S, FX1N, FX2N, FX1NC and FX2NC PLCs: X000 to X005
FX
U and FX2C PLCs: X000 to X005
2) An input device X000 to X007 (X000 to X005) specified by cannot overlap the following functions or
instructions:
- High speed counter
- Input interrupt
- Pulse catch
- Pulse width measurement
-DSZR
-DVIT
-ZRN
3) For one input, this instruction can be used only once.
4) The maximum input frequency is shown below:
*1. When receiving pulses within the response frequency range of 50k 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.
2. Specifying input and output variables
When handling 32-bit data in a structured program, a 16-bit device cannot be specified directly as in the case
of a simple project. Use a label to handle 32-bit data.
A 32-bit counter can be specified directly as it is a 32-bit long device.
Use a global label to specify a device.
3. 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 .
4. Restrictions to devices
S1: X000 to X007 (X005) can be specified.
Refer to "Cautions".
S2: Applicable to the FX
3U
, FX
3UC
and FX
3G
PLCs only.
S3: Applicable to the FX
3U
and FX
3UC
PLCs only.
Used input number FX3UC PLC
FX3U PLC
Main unit FX3U-4HSX-ADP
X000 to X005
100kHz
*1
100kHz
*1
200kHz
X006 to X007 10kHz 10kHz
Used input number FX3G PLC
X000, X001, X003, X004 60kHz
X002, X005, X006, X007 10kHz
Used input number FX1S, FX1N, FX2N, FX1NC and FX2NC PLCs
X000, X001 60kHz
X002, X003, X004, X005 10kHz
Used input number FXU and FX2C PLCs
X000, X002, X003 10kHz
X001, X004, X005 7kHz
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