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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
20 Positioning Control – FNC150 to FNC159
20.5 FNC156 – ZRN / Zero Return
11
FNC30-FNC39
Rotation and
Shift
12
FNC40-FNC49
Data Operation
13
FNC50-FNC59
High Speed
Processing
14
FMC60-FNC69
Handy
Instruction
15
FNC70-FNC79
External FX I/O
Device
16
FNC80-FNC89
External FX
Device
17
FNC100-FNC109
Data
Transfer 2
18
FNC110-FNC139
Floating Point
19
FNC140-FNC149
Data
Operation 2
20
FNC150-FNC159
Positioning
Control
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 FX3UC
Ver.1.00
or later
Ver.2.20
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