532
FX
3U
/FX
3UC
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 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.
→
For cautions on using special high speed output adapters, refer to the Positioning Control Edition.
1. Instruction format
2. Set data
*1.
Setting range: 10 to 32767 Hz in 16-bit operation
Following range in 32-bit operation
3. Applicable devices
S
1 : "D
.b" cannot be indexed with index registers (V and Z).
S
2 : Specify a transistor output Y000, Y001, or Y002 in the main unit or Y000, Y001, Y002
*2
, or Y003
*2
in a
special high speed output adapter
*1
.
*1.
Special high speed output adapters cannot be connected to the FX
3UC
-32MT-LT.
*2.
For specifying Y002 or Y003 in a special high speed output adapter, the second special high
speed output adapter is required.
Points
• When using a relay output type FX
3U
PLC, a special high speed output adapter is required.
• Outputs of special high speed output adapters work as differential line drivers.
Operand type
Description
Data type
Speed when zero return is started
*1
16- or 32-bit binary
Creep speed [10 to 32767 Hz]
Device number inputting near-point signal (dog)
Bit
Device number outputting pulse
Pulse output destination
Setting range
FX
3U
PLC
Special high speed output adapter
10 to 200,000 (Hz)
FX
3UC
PLC
Main unit
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
X Y M T C S D
.b KnX KnY KnM KnS
T
C
D
R U
\G
V
Z Modify K
H
E
"
"
P
3
3
3
3
3 3 3 3
3
3 3
3
3 3
3
3
3
3
3 3 3 3
3
3 3
3
3 3
3 3 3
3
S
1
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