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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
20.5 FNC156 – ZRN / Zero Return
Outline
This instruction executes a zero return, and aligns the mechanical position with a present value register inside the
PLC.
When the dog search function is required, use DSZR (FNC150) instruction.
→ For explanation of the instruction, refer to the Positioning Control Edition manual.
→ For cautions on using special high speed output adapters,
refer to the Positioning Control Edition manual.
1. Instruction format
2. Set data
*1. Setting range: 10 to 32767 Hz for 16-bit operation
Following range for 32-bit operation
3. Applicable devices
S1:"D.b" is available only in FX3U and FX3UC PLCs. However, index modifiers (V and Z) are not available.
S2 : Specify Y000, Y001 or Y002
*1
transistor output from the main unit, or specify Y000, Y001, Y002
*3
or Y003
*3
from a high-speed output special adapter
*2
.
*1. Y002 is not available in 14-point and 24-point type FX
3G PLC.
*2. High-speed output special adapters can be connected only to FX
3U PLC.
*3. To use Y002 and Y003 with a high-speed output special adapter, connected a second high-speed output
special adapter.
Points
• When using a relay output type FX3U PLC, a special high speed output adapter is required.
• Outputs of special high speed output adapters work as differential line drivers.
S3 : This function is supported only in FX
3U/FX3UC PLCs.
Operand type Description Data type
Initial zero return speed
*1
16- or 32-bit binary
Creep speed [10 to 32767 Hz]
Device number for near-point signal (dog)
Bit
Device number (Y) from which pulses are to be output
Pulse output destination Setting range
FX
3U PLC Special high speed output adapter 10 to 200,000 (Hz)
FX
3G/FX3U/FX3UC PLC Main unit (transistor output) 10 to 100,000 (Hz)
Oper-
and
Type
Bit Devices Word Devices Others
System User Digit Specification System User
Special
Unit
Index
Con-
stant
Real
Number
Charac-
ter String
Pointer
XYMTCSD.b KnX KnY KnM KnS T C D R U\G VZModifyKH E ""P
33333333S3 33 3 33
33333333S3 33 3 33
333 3 S1 3
S
2
3
FNC 156
ZRN
D
ZRN
16-bit Instruction
9 steps
Mnemonic Operation Condition
Continuous
Operation
DZRN
32-bit Instruction
17 steps
Mnemonic Operation Condition
Continuous
Operation
S
1
S
2
S
3
D
S
1
S
2
S
3
D