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396
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
13 High Speed Processing – FNC 50 to FNC 59
13.9 FNC 58 – PWM / Pulse Width Modulation
Cautions
1. Setting the pulse width and period
Make sure that the pulse width
and period
satisfy the relationship "
≤
".
2. Pulse output
• Only the following outputs can be specified in
according to the system configuration.
- When using special high speed output adapters
*1
: Y000, Y001, Y002
*2
, or Y003
*2
- When transistor outputs in the main unit are used: Y000, Y001, or Y002
*3
*1.
High-speed output special adapters can be connected only to FX
3U
PLC.
When using the PWM (FNC 58) 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 is not available in 14-point and 24-point type FX
3G
PLC.
• The pulse output is controlled by interrupt processing not affected by the sequence program (operation
cycle).
• If the command input is set to OFF, the output from
turns OFF.
• 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 drive 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.
Pulse output destination device
Pulse output monitor flag
Y000
M8340
Y001
M8350
Y002
M8360
Y003
M8370
S
1
S
2
S
1
S
2
D
D