Mitsubishi FX3G Series Programming Manual

550
FX3G/FX3U/FX3GC/FX3UC Series
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
3UC PLC Ver. 2.20 or later and FX3G/FX3U/FX3GC PLCs.
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
FX3G FX3U FX3GC FX3UC
Ver. 1.00
or later
Ver. 2.20
or later
Ver. 1.40
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

Mitsubishi FX3G Series Specifications

General

Model	FX3G Series
Power Supply	AC 100-240V or DC 24V
Program Capacity	32, 000 steps
Execution Speed	0.21 µs/basic instruction
Communication Options	RS-422, USB, Ethernet
Expansion Modules	Analog, digital, communication
Programming Language	Ladder Logic, Instruction List
Built-in Functions	High-speed counters, pulse output
Analog I/O	Available via expansion modules