7 Applied Instructions
7.6 High Speed Processing
315
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
1
Outline
2
Instruction List
3
Configuration of
Instruction
4
How to Read
Explanation of
Instructions
5
Basic Instruction
6
Step Ladder
Instructions
7
Applied
Instructions
8
Interrupt Function
and Pulse Catch
Function
A
Relationships
between devices
and addresses
Function and operation explanation
1. 16-bit operation (PWM)
Pulses whose ON pulse width (ms) is specified by are output in periods (ms) specified by to the
device specified by
• Specify the pulse width "t" in .
Allowable setting range: 0 to 32,767ms
• Specify the period "T0" in
Allowable setting range: 1 to 32,767ms
• Specify the output (Y) number from which pulses are to be output in .
Allowable setting range: Refer to "Cautions".
Cautions
1. Setting the pulse width and period
Make sure that the pulse width and period satisfy the relationship " ≤ ".
2. Pulse output
1) Only the following outputs can be specified in according to the system configuration.
•For FX
3U, FX3UC and FX3G PLCs
- When using special high speed output adapters
*1
: Y000, Y001, Y002
*2
, Y003
*2
- When using transistor outputs on the main unit (that is, when not using special high speed output
adapters): Y000, Y001, Y002
*3
*1. Special high speed output adapters can be connected only to the FX3U PLC.
When using the PWM instruction with a relay output type FX
3U PLC, a special high speed output
adapter is required.
*2. When specifying Y002 or Y003 on a special high speed output adapter, a second special high
speed output adapter is required.
*3. "Y002" cannot be used for the 14- or 24-type FX
3G PLC.
•For FX
1S, FX1N, FX2N, FX1NC and FX2NC PLCs
Only Y000 or Y001 is valid (transistor output).
•For FX
0, FX0S and FX0N PLCs
Only Y001 is valid (transistor output).
•For FX
U and FX2C PLCs
All Ys are valid (transistor output).
2) The pulse output is controlled by interrupt processing not affected by the sequence program (operation
cycle).
3) If the command input is set to OFF, the output from the device specified by turns OFF.
4) While a pulse output monitor (BUSY/READY) flag is ON, a pulse output or positioning instruction for the
same output relay cannot be executed.
While a pulse output monitor flag is ON even after the instruction derive contact is set to OFF, a pulse
output or positioning instruction for the same output relay cannot be executed.
Before executing a pulse output or positioning instruction, wait until the pulse output monitor flag turns
OFF and one or more operation cycles pass.
(Only the FX
3U, FX3UC and FX3G PLCs are compatible with the pulse output monitor flags.)
Pulse output destination device Pulse output monitor flag
Y000 M8340
Y001 M8350
Y002 M8360
Y003 M8370
Command
input
t
T
0
Pulse width
Period
PWM
EN
s1
s2
ENO
d
t
T
0
d
Device (Y) from which
pulses are to be output
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