7 Applied Instructions
7.6 High Speed Processing
310
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
Cautions
1. When a word device is specified as or
When the value of the word device is changed while the instruction is executed, the following operation
results.
• When the data in is changed, the output frequency changes accordingly.
• When the data in is changed, the change (new value) becomes valid the next time the instruction is
driven.
2. Frequency
When using transistor outputs in the main unit, set the output frequency specified by as follows.
•FX
3U and FX3UC PLCs : 16-bit instruction→1 to 32,767Hz
32-bit instruction→1 to 200,000Hz (
When using special high speed output
adapter)
→1 to 100,000Hz (
When using main unit)
•FX3G PLC : 16-bit instruction→1 to 32,767Hz
32-bit instruction→1 to 100,000Hz
•FX
2N and FX2NC PLCs : 2 to 20,000Hz
•FX
1NC PLC : 1 to 10,000Hz
•FX
1S and FX1N PLCs : 16-bit instruction→1 to 32,767Hz
32-bit instruction→1 to 100,000Hz
•FX
0, FX0S and FX0N PLCs : 10 to 2,000Hz
•FX
U and FX2C PLCs : 1 to 1,000Hz
3. 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.
4. Pulse quantity
The pulse quantity can be set in the range from 1 to 32767 (PLS) for 16-bit instructions and from 1 to
2,147,483,647 (PLS) for 32-bit instructions. If set to zero, pulse generates infinitely.
5. Pulse output
1) Only a transistor output on the main unit or the following special high speed output adapters
*1
can be
specified in .
•FX
3U, FX3UC and FX3G : Y000, Y001
•FX1S, FX1N, FX2N, FX1NC and FX2NC PLCs : Y000, Y001
•FX
0, FX0S and FX0N PLCs : Y000
•FX
U and FX2C PLCs : Valid for all Y
When using the PLSY instruction with a relay output type FX
3U PLC, a special high speed output adapter
is required.
*1. Special high speed output adapters can be connected only to the FX
3U PLC.
2) The duration of the ON/OFF pulses is 50% (ON = 50%, OFF = 50%)
3) The pulse output is controlled by the dedicated hardware not affected by the sequence program
(operation cycle).
4) If the command input is set to OFF during continuous pulse output, the output from the device specified
by turns OFF.
6. Restrictions to target devices
S1: Refer to item 1 of "Cautions".
S2: Applicable only to the FX3U, FX3UC and FX3G PLCs.
S3: Applicable only to the FX
3U and FX3UC PLCs.
(Special high speed output adapters can be connected only to the FX
3U PLC.)
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