558
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
20 Positioning Control – FNC150 to FNC159
20.6 FNC157 – PLSV / Variable Speed Pulse Output
Explanation of function and operation
Caution on writing during RUN
During RUN, avoid writing while PLSV (FNC157) instruction is executed (that is, while pulses are output).
Note that if writing is executed during RUN to a circuit block including FNC157 instruction while pulses are output, the
PLC executes the operation shown below.
*1.
Only available for FX
3U
/FX
3UC
PLC Ver.2.20 or later and FX
3G
PLC.
Function change depending on the version
The function of the FNC157 instruction is changed depending on the version as shown in the table below.
→
For explanation of the instruction and the contents of function change,
refer to the Positioning Control Edition.
PLC operation when writing is excuted during RUN while instruction is
executed
During operation with acceleration/deceleration
*1
Decelerates and stops pulse output.
During operation without acceleration/deceleration
Immediately stops pulse output.
Applicable version
Item
Outline of function
FX
3G
FX
3U
FX
3UC
Ver.1.00
or later
Ver.2.20
or later
Ver.2.20
or later
Acceleration/
deceleration operation
function
When M8338 is set to ON, the PLC accelerates or decelerates up to
in the acceleration or deceleration time corresponding to
if
changes.
Command
input
FNC157
PLSV
S
1
D
1
D
2
S
1
D
1
S
1