Mitsubishi FX3G Series Programming Manual

548
FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
20 Positioning Control – FNC150 to FNC159
20.5 FNC156 – ZRN / Zero Return
Explanation of function and operation
Caution on writing during RUN
During RUN, avoid writing while the ZRN (FNC156) instruction is executed (that is, while pulses are output).
Note that if writing is executed during RUN to a circuit block including the FNC156 instruction while pulses are output,
the PLC decelerates and stops pulse output.
Function change depending on the version
The function of FNC156 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.
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
Clear signal output
destination
specification function
When a special auxiliary relay corresponding to is set to
ON, the clear signal output destination is changed to an output
number specified by a special data register corresponding to
.
Command
input
FNC156
ZRN
S 1  S 2  S 3  D 
D
D

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